PT0E-20510

Portable Gas Monitor

GX-3R Pro
(MED specification)
Operating Manual(PT0-165)

2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Phone : +81-3-3966-1113
Fax : +81-3-3558-9110
E-mail : intdept@rikenkeiki.co.jp
Web site : https://www.rikenkeiki.co.jp/

Contents
1 Product Overview ............................................................................................................................................ 5
1-1. Introduction ............................................................................................................................................ 5
1-2. Intended use .......................................................................................................................................... 5
1-3. Checking the detection target gases ..................................................................................................... 6
1-4. DANGER, WARNING, CAUTION, and NOTE ....................................................................................... 7
1-5. Checking standards and explosion-proof specifications ....................................................................... 7
2 Important Safety Information ........................................................................................................................... 8
2-1. Danger information ................................................................................................................................ 8
2-2. Warning information ............................................................................................................................... 9
2-3. Caution information .............................................................................................................................. 10
2-4. Safety information ................................................................................................................................ 12
3 Product Configuration .................................................................................................................................... 15
3-1. Main unit and standard accessories .................................................................................................... 15
Main unit .............................................................................................................................................. 15
Standard accessories.......................................................................................................................... 16
3-2. Part names and functions .................................................................................................................... 17
Main unit .............................................................................................................................................. 17
Battery unit .......................................................................................................................................... 18
LCD display ......................................................................................................................................... 19
4 Alarm Activation ............................................................................................................................................. 20
4-1. Gas alarm activation ............................................................................................................................ 20
4-2. Fault alarm activation ........................................................................................................................... 23
4-3. Panic alarm .......................................................................................................................................... 24
Panic alarm buzzer sounding and lamp flashing patterns .................................................................. 24
Panic alarm activation and alarm pattern ........................................................................................... 24
4-4. Man down alarm................................................................................................................................... 25
Man down alarm buzzer sounding and lamp flashing patterns .......................................................... 25
Man down alarm display and alarm patterns ...................................................................................... 25
5 Usage Instructions ......................................................................................................................................... 26
5-1. Before using the product ...................................................................................................................... 26
5-2. Preparing startup ................................................................................................................................. 26
5-2-1. Charging and attaching the lithium ion battery unit (BUL-3R) ................................................. 26
5-3. Startup .................................................................................................................................................. 29
Turning on the power .......................................................................................................................... 29
Screen transition from powering on to displaying measurement screen ........................................... 30
5-4. Air calibration........................................................................................................................................ 33
Air calibration procedure ..................................................................................................................... 33
5-5. Gas detection ....................................................................................................................................... 35
5-5-1. Basic operating procedures ...................................................................................................... 36
5-5-2. Measurement mode .................................................................................................................. 37
5-6. Turning off the power ........................................................................................................................... 39
6 Setting Procedure .......................................................................................................................................... 40
6-1. Display mode ....................................................................................................................................... 40
6-1-1. Displaying display mode ........................................................................................................... 40
6-1-2. Display mode display details .................................................................................................... 40
6-2. Display mode settings .......................................................................................................................... 43
6-2-1. Clearing PEAK value display .................................................................................................... 43
6-2-2. Combustible gas conversion setting ........................................................................................ 44
6-2-3. Long-life battery setting ............................................................................................................ 46
6-2-4. Calibration data display ............................................................................................................ 47
6-2-5. Bump data display .................................................................................................................... 48
6-2-6. Alarm setpoint display............................................................................................................... 49
6-2-7. LCD inversion setting ............................................................................................................... 50
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6-2-8. LCD background setting ........................................................................................................... 51
6-2-9. Bluetooth setting ....................................................................................................................... 51
6-2-10. Buzzer volume adjustment ..................................................................................................... 52
6-2-11. Display language setting......................................................................................................... 52
6-3. User mode ............................................................................................................................................ 54
6-3-1. Displaying user mode ............................................................................................................... 54
6-3-2. User mode settings ................................................................................................................... 55
6-4. User mode settings .............................................................................................................................. 56
6-4-1. Bump test .................................................................................................................................. 56
6-4-2. Calibration ................................................................................................................................. 56
6-4-3. Calibration expiration date setting ............................................................................................ 56
6-4-4. Bump test setting ...................................................................................................................... 60
6-4-5. Man down alarm setting ........................................................................................................... 66
6-4-6. Alarm setpoint setting ............................................................................................................... 68
6-4-7. Lunch break: ON/OFF .............................................................................................................. 71
6-4-8. Confirmation beep setting ........................................................................................................ 71
6-4-9. Automatic backlight: ON/OFF ................................................................................................... 74
6-4-10. Backlight lighting time setting ................................................................................................. 74
6-4-11. Key tone: ON/OFF .................................................................................................................. 75
6-4-12. Display mode item display: ON/OFF ...................................................................................... 75
6-4-13. CO2 sensor unit selection ....................................................................................................... 76
6-4-14. CO2 sensor air calibration: ON/OFF ....................................................................................... 76
6-4-15. Date and time setting.............................................................................................................. 77
6-4-16. Date format setting ................................................................................................................. 77
6-4-17. Language setting .................................................................................................................... 78
6-4-18. User password setting ............................................................................................................ 79
6-4-19. ROM/SUM display .................................................................................................................. 80
6-4-20. Bluetooth authentication display ............................................................................................ 80
7 Maintenance .................................................................................................................................................. 81
7-1. Maintenance intervals and maintenance items ................................................................................... 81
Maintenance service ........................................................................................................................... 82
7-2. Calibration ............................................................................................................................................ 83
7-2-1. Preparation for calibration ........................................................................................................ 83
7-2-2. Calibration setting menu ........................................................................................................... 86
7-2-3. Air calibration ............................................................................................................................ 87
7-2-4. CO2 zero calibration ................................................................................................................. 89
7-2-5. Auto calibration ......................................................................................................................... 90
7-2-6. Switch from AUTO calibration to measurement start screen ................................................... 91
7-2-7. Auto calibration cylinder setting ................................................................................................ 92
7-2-8. Auto calibration gas concentration selection ............................................................................ 93
7-3. Bump test ............................................................................................................................................. 94
7-3-1. Perform bump test (BUMP TEST) .................................................................................................... 94
7-3-2. Switching from bump test (BUMP TEST) to measurement start screen .......................................... 96
7-5. Parts replacement ................................................................................................................................ 97
7-5-1. Periodic replacement parts ....................................................................................................... 97
7-5-2. Filter replacement ..................................................................................................................... 99
8 Storage and Disposal .................................................................................................................................. 101
8-1. Procedures for storage or when not in use for extended periods ..................................................... 101
8-2. Procedures for use after storage ....................................................................................................... 102
8-3. Product disposal................................................................................................................................. 102
9 Troubleshooting ........................................................................................................................................... 103
9-1. Product abnormalities ........................................................................................................................ 103
9-2. Reading abnormalities ....................................................................................................................... 105
10 Product Specifications ............................................................................................................................... 106
10-1. Specifications list ............................................................................................................................. 106
10-2. Accessory list ................................................................................................................................... 112
3 /121

11 Appendix .................................................................................................................................................... 113
Data logger function .................................................................................................................................. 113
100 %LEL = ppm conversion list ............................................................................................................... 115
Radio Law Certification ............................................................................................................................. 116
Limited Warranty and Limitation Liability .................................................................................................. 121

4 /121

1 Product Overview

1-1. Introduction1
1

Product Overview

1-1. Introduction
Thank you for your purchase of the GX-3R Pro MED specification Portable Gas Monitor (“product”
hereinafter). First, confirm that the model number of the product you purchased matches the model numberof the product covered by this manual.
The product should be used only by fully-trained personnel.
The maintenance procedures described in this manual should be performed only by fully-trained personnel.
Any maintenance procedure not described in this manual must be performed by Riken Keiki or our certified
service engineers. Please contact Riken Keiki.
This manual describes how to use the product and provides product specifications. Make sure you haveread and fully understand the contents of this manual before using the product. This applies both to first-timeusers and those who have previously used the product.
Keep this manual in a safe place for future reference.
The contents of this manual are subject to change without notice to allow product improvements. Any
duplication or reproduction of this manual without permission is prohibited, whether in whole or in part.
In addition to this manual, manuals are also provided for optional products (sold separately). Refer to thefollowing manuals along with this manual when using optional products (sold separately):1) RP-3R Pump Unit Operating Manual (PT0E-166)
2) SW-GX-3R Data Logger Management Program Software Operating Manual (PT0E-178)
3) SDM-3R Docking Station Operating Manual (PT0E-167)
Regardless of the warranty period, Riken Keiki does not accept any liability for accidents or damage
resulting from use of the product.
Be sure to read the warranty policy set forth on the warranty.

1-2. Intended use
The product is a multi-gas monitor equipped with up to four types of sensors to enable detection of fivedifferent gas types using a single unit.
The detection target gases vary depending on the particular sensors installed in the product. Check thedetection target gases before use to confirm the correct gases will be detected in accordance with theintended purpose.
The product is a gas detector designed to measure the concentrations of chemicals in the air in working
environments. It measures concentrations of toxic gases, combustible gases, and oxygen in the air andissues an alarm if concentrations exceed preset levels, thereby alerting users to the hazards of gas
poisoning and oxygen deficiency.

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1 Product Overview

1-3. Checking the detection target gases

1-3. Checking the detection target gases
The combination of detection target gases will vary depending on the particular sensors installed in the
product.
Check the detection target gases on the nameplate attached to the rear of the product before use.

The detection target gases can be checked via the product code.

Rear(Fixed)<Sensor>PositionSpec.

①

Combustible gas (HC or CH4) sensor②

Oxygen (O2) sensor③④

Carbon monoxide/hydrogen sulfide(CO/H2S) sensor
Carbon monoxide (CO) sensor*
Sulfur dioxide (SO2) sensor
Hydrogen sulfide (H2S) sensor
Carbon monoxide (CO) sensor
Hydrogen cyanide (HCN) sensor⑤⑥

Sensor model
NCR-6309
NCR-6309
ESR-X13P

Symbol
H: Installed (HC)
M: Installed (CH4)
0: Not installed
1: Installed
0: Not installed

ESR-A1DP

E1
E2
E3
E4
E5
E7

Sulfur dioxide (SO2) sensor

ESR-A1CPESR-A13D
ESR-A13i
ESR-A13P
ESR-A13D
ESR-A13D

Hydrogen sulfide (H2S) sensor
Nitrogen dioxide (NO2) sensor
Hydrogen cyanide (HCN) sensor
Phosphine (PH3) sensor
Ammonia (NH3) sensor
Carbon dioxide (CO2) <vol%> sensor
Carbon dioxide (CO2) <ppm> sensor-

ESR-A13i
ESR-A13D
ESR-A13D
ESR-A13D2
ESR-B134
IRR-0409
IRR-0433
-

E4
E6
E7
E8
E9
D1
D2
00

E3

<Battery unit>
Position⑦

Battery
unit model
BUL-3RSpec.
Lithium ion battery

SymbolL<BLE function>
PositionSpec.
SymbolBLE supported
1⑧
BLE unsupported
0* The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce interference due tohydrogen. This function works for hydrogen concentrations up to 2,000 ppm. (However, if used in anenvironment exceeding 40°C for more than 15 minutes, it may be affected by hydrogen interference
and may indicate a higher carbon monoxide concentration than actual.)
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1 Product Overview

1-4. DANGER, WARNING, CAUTION, and NOTE

1-4. DANGER, WARNING, CAUTION, and NOTEThis manual uses the following headings to ensure safe and effective work:

DANGER

This indicates situations in which improper handling may result in fatalor serious injury to persons or serious damage to property.

WARNING

This indicates situations in which improper handling may result inserious injury to persons or serious damage to property.

CAUTION

This indicates situations in which improper handling may result in minor
injury to persons or minor damage to property.

NOTE

This indicates handling tips.

1-5. Checking standards and explosion-proof
specifications
The product specifications will vary depending on the specific standards and explosion-proof certification.
Check the actual product specifications before use. For CE marking models, refer to the “Declaration ofConformity” in the Appendix.
Check the affixed nameplate for product specifications.

Ex marking
CE marking

ATEX/IECEx,CE marking
type name plate

7 /1212 Important Safety Information

2-1. Danger information

22

Important Safety
Information

To maintain the performance of the product and to ensure safe use, always observe the following DANGER,WARNING, and CAUTION instructions.

2-1. Danger information
DANGER
Explosion-proofing Do not modify or alter the circuitry or configuration.
Usage If measuring inside manholes or enclosed spaces, never lean over or look into the manhole or
enclosed space. There is a danger that oxygen-deficient air or other gases may be discharged fromsuch locations.

8 /1212 Important Safety Information

2-2. Warning information

2-2. Warning informationa

WARNING

If an abnormality is discovered in the product If an abnormality is discovered in the product, contact Riken Keiki immediately. Visit our website
for information on the nearest Riken Keiki office.
Website: https://www.rikenkeiki.co.jp/
Sensor handling Do not attempt to disassemble the electrochemical type sensor inside the product. Electrolyte
contained inside may cause inflammation if it comes into contact with the skin. There is also a riskof blindness if it comes into contact with the eyes. Electrolyte may discolor or decompose clothing
if it comes into contact with clothing. If contact occurs, rinse the area immediately with plenty ofwater. Do not use any gas other than nitrogen as the balance gas when calibrating or adjusting an
oxygen sensor.
Fresh air adjustment in the atmosphere When fresh air adjustment is performed in the atmosphere, check the atmosphere for freshness
before starting. The presence of interference gases will make it impossible to adjust the productcorrectly, resulting in the danger of erroneous detection when actual gas leaks occur.
Action when a gas alarm occurs
 When a gas alarm occurs, this indicates an extremely dangerous situation. The user must takeappropriate action after taking steps to ensure safety.
Panic alarm and man down alarm The panic and man down alarms are intended to assist the user and those in the vicinity to makeappropriate decisions. They are not intended to assure life or safety. Do not depend solely on thisfunction when using the product.
(The man down alarm is normally disabled and unavailable. To use this function, change theproduct setting.)
 If a panic or man down alarm is triggered, those in the vicinity must take appropriate action after
assessing the situation.
Battery level check Check battery levels before using the product. The batteries may be depleted when the product isused for the first time or after extended periods without use. Replace the batteries with new ones
before use.
 If a low battery voltage alarm occurs, gas cannot be detected. If the alarm is issued during use,turn off the power and promptly charge or replace the batteries in a safe place.
Miscellaneous Gas cannot be detected if the sensor is covered with water such as rainwater. Do not use theproduct in rain or submerge it in water.
 When wearing the product, make sure that it is exposed to the air. If it is covered or blocked,
correct measurement cannot be obtained, possibly resulting in accidents.
 Do not dispose of the product into fire.
 Do not attempt to wash the product, either in a washing machine or an ultrasonic cleaningmachine.
 Do not block the buzzer sound opening. Doing so will muffle or silence the audible warning.
 Do not remove the battery unit while the power is turned on.
 The product is a personal gas monitor to be worn on the body. Therefore, before using the productin a confined space, suspend it with a separately prepared rope, tie it to the end of a rod or connect
the suction pump unit RP-3R (sold separately) to detect the atmosphere from the outside of theconfined space to confirm safety in advance.
 While conducting measurement in a confined space, do not lean over or look into the closed space.
It may lead to dangers because oxygen-deficient air or other gases may blow out.
9 /1212 Important Safety Information

2-3. Caution information

2-3. Caution information
CAUTION Do not use the product in locations where it may be exposed to oil or chemicals, etc.
‧ Avoid using the product in locations where the product may be splashed with liquids such as oiland chemicals.
‧ Do not place the product in locations where water or dirt accumulates. Placing the product insuch locations may cause malfunction due to water or dirt ingress into the buzzer sound opening,etc.
 Do not use the product in locations where the temperature exceeds the range of operating
temperatures.
‧ The operating temperature range for the product is as follows. Avoid using the product attemperatures outside the operating range.
‧ Other than HCN, NH3:
‧ Continuous use environment: -20 °C to +50 °C‧ Temporary use environment:-40 °C to +60 °C‧ HCN:‧ Continuous use environment: -20 °C to +50 °C‧ Temporary use environment:-20 °C to +60 °C‧ NH3:‧ Continuous use environment: -20 °C to +50 °C‧ Temporary use environment:-30 °C to +50 °C‧ Avoid using the product for extended periods in locations where it is exposed to direct sunlight.
‧ Avoid storing the product inside parked vehicles in hot weather.
 Adhere to the operating humidity range to prevent condensation forming inside the product.
Condensation forming inside the product may cause clogging or gas adsorption, which may
prevent accurate gas detection. Condensation must be avoided at all costs. In addition to theusage environment, carefully monitor the temperature and humidity of the sampling point toprevent condensation forming inside the product.
 Do not use walkie-talkies near the product.
‧ Radio waves from walkie-talkies or other radio wave transmitting devices near the product may
affect readings. If walkie-talkies or other radio wave transmitting devices are used, these must be
used away from the product where they do not affect operation.
‧ Do not use the product near devices that emit strong electromagnetic radiation (high-frequency
or high-voltage devices).
 Verify that the operation status display is blinking before using the product.
If the operation status display is not blinking, gas cannot be detected properly.

10 /121

2 Important Safety Information

2-3. Caution information

CAUTION Be sure to perform regular maintenance.
The product must be maintained regularly to ensure safety. Continuing to use the product withoutmaintaining it will result in sensor sensitivity variations, preventing accurate gas detection.
 Miscellaneous‧ Pressing buttons unnecessarily may change the settings, preventing alarms from activatingcorrectly. Avoid performing any operations not described in this operating manual.
‧ Do not drop the product or subject it to impact. Doing so may degrade texplosion-proof,
waterproof, dustproof, and gas detection performance.
‧ Do not use the product while charging it.
 Do not poke the buzzer or sensor openings with sharp-pointed items. Doing so may result in
ingress of water or foreign matter, resulting in malfunctions or damage to the product.
 Do not block the buzzer sound opening with tape or other objects. This will prevent adjustment of
the internal pressure of the product, which may result in malfunctions.
 Do not remove the panel sheet on the LCD display. Doing so will impair waterproof and dustproof
performance.
 Do not cover the infrared port with labels or any other objects. This will prevent infraredcommunication.
 Usage‧ The operating time will be reduced due to battery performance in cold environments.
‧ The response of the LCD display may slow at low temperatures.
‧ Always perform air calibration under conditions of pressure, temperature, and humidity similar to
those in the operating environment and in fresh air.
‧ Wait for the readout to stabilize before performing air calibration.
‧ If there is a temperature difference of 15 °C or more between the storage and usage locations,
turn on the power and allow the product to stand and acclimatize for about 10 minutes (about 30
minutes if the product is equipped with an ammonia (NH3) sensor) in an environment similar to theusage location before performing air calibration in fresh air.
‧ When an ammonia (NH3) sensor is installed, the indication may rise temporarily immediately after
the sensor is energized due to its characteristics. When replacing the battery before it runs out,
please wait at least 10 minutes before turning the power back on. Also. When the sensor is
replaced, the battery is replaced because it is dead, or the battery is removed and has not beenused for a long period of time, turn the power back on after 120 minutes or more.
‧ When wiping the product clean, do not splash water on it or use organic solvents like alcohol or
benzine. Doing so may discolor or damage the surfaces of the product.
‧ If the product will not be used for extended periods, install new batteries before storing. Replace
the batteries every six months. Battery leaks may result in fire or injury.
‧ After a period of extended storage, be sure to perform calibration before resuming use. For
information on readjustment including calibration, please contact Riken Keiki.
Sensors‧ Note that if combustible gas sensors are used in an environment where silicone compounds,
halides, high concentrations of sulfides, or high concentrations of solvent gases are present,
sensor life may be reduced, sensitivity to combustible gases may deteriorate, and accurate
readings may not be obtained. If use in such environments is unavoidable, use for the shortest
possible time and allow the product to stand in fresh air after use. Confirm that the reading
returns to normal and is stabilized.
‧ An oxygen concentration higher than a certain level is required in order for the combustible gas
sensor <%LEL> in the product to correctly detect gases and display concentrations.
‧ Do not expose the product to sudden pressure fluctuations. Oxygen readings will vary
temporarily, preventing accurate measurement.
‧ Do not use any gas other than nitrogen as the balance gas when calibrating or adjusting an
oxygen sensor. Otherwise, oxygen reading errors will increase, preventing accurate
measurement.
‧ When equipped with a carbon dioxide (CO2) sensor, it may show a high indication immediately
after energization due to the characteristics of the sensor
You Warm it up for about 10 to 20 minutes and use it after instructions are stable.

11 /121

2 Important Safety Information

2-4. Safety information

2-4. Safety information
Necessary information for explosion proof construction of Model GX-3R Pro.

Overview
The GX-3R Pro can measure up to 5 gases using 4 sensors.
The GX-3R Pro measures the combustible gases (LEL), oxygen (O2), hydrogen sulfide (H2S), and carbon
monoxide (CO).
The GX-3R Pro can additionally measure toxic gases including carbon and sulfur dioxides (CO2 and SO2).
This model displays measurement results on an LCD and issue gas alarms (via LED and buzzer) as
needed. This model also wirelessly transmits measurement results to a host using Bluetooth.
Gas sampling is by diffusion. The models do not have internal suction pumps.

Power sources
The GX-3R Pro draws power from either a Li-ion battery unit (BUL-3R), which has integral components formaintaining intrinsic safety.
These battery units are user-replaceable in non-hazardous areas.
A dedicated AC adapter is used for recharging the Li-ion battery.
<ATEX/IECEx specification>
Explosion proof
structure
Specification for safety

Intrinsically safe explosion-proof construction and flame-proof enclosures
Ex da ia I Ma , Ex da ia IIC T4 Ga (with combustible gas sensor NCR-6309)
Ex ia I Ma , Ex ia IIC T4 Ga (without combustible gas sensor NCR-6309)
I M1 Ex da ia I Ma, II 1 G Ex da ia IIC T4 Ga(with combustible gas sensor NCR-6309)
I M1 Ex ia I Ma, II 1 G Ex ia IIC T4 Ga(without combustible gas sensor NCR-6309)

Ambient temperature
range
Ambient temperature
range (for charging)Electrical data

Certificate numbers
List of standards-40°C to +60°C
0°C to +40°C
・ Lithium-ion battery: Maxell rechargeable battery model no. ICP463048XS・ The battery should be charged with the dedicated AC adapter or by powerfrom a IEC60950-certified SELV power source, or IEC62368-1-certified
ES1 power source. The maximum voltage from the charger shall not
exceed 6.3Vdc.
・ IECEx : IECEx DEK 17.0050 X
・ ATEX : DEKRA 17 ATEX 0103 X
・ EN IEC 60079-0:2018
・ IEC 60079-0:2017
・ IEC 60079-1:2014-06 ・ EN60079-1:2014
・ IEC 60079-11:2011
・ EN60079-11:2012
・ EN50303:2000

SPECIFIC CONDITIONS OF USEWhen the portable gas monitor is equipped with thermo catalytic gas sensor model NCR-6309 in type ofprotection Ex da:
・ The sensor model NCR-6309 is tested with low risk of mechanical danger for use in a Group I
environment, therefore it shall be protected against high impact energy.
・ The Sensor model NCR-6309 shall not be exposed to ultraviolet light or used in equipment in which
it is not fully enclosed.
・ The Sensor model NCR-6309 is a flameproof product and is not to be disassembled or modified
with the exception of specified parts.
・ The equipment shall not be exposed to oil or hydraulic fluid.
12 /121

2 Important Safety Information

2-4. Safety information

WARNING Do not attempt to disassemble or modify the instrument.
 The combustible gas sensor NCR-6309, to measure LEL, is the only part of this Gas Monitor systemwith flame - proof construction.
 This product is an explosion-proof product and is not to be disassembled or modified with the
exception of specified parts.
 NCR-6309 must not be exposed to ultraviolet light.
 This product integrates a sensor having flameproof construction. If assembly is not performed as
specified, explosion protection performance will be compromised. When replacing the sensor andfilter, properly install genuine parts and torque to specification.
 If the enclosure is damaged it shall be repaired before further use.
 The Sensor shall not be exposed to ultraviolet light or used in equipment in which it is not fully
enclosed.
 Do not charge in a hazardous location.
 Do not charge the unit with a non-genuine charger.
 Do not replace battery unit in a hazardous location.

Sensor coverSensor cap
NCR-6309

Location of screws for performing replacement
Tightening specification: At least 10 N･cm
Maximum sensor surface temperature 82.6°C

13 /121

2 Important Safety Information

2-4. Safety information

Instruments No.
INST. No. 00 0 000 0000 00
A B C
D
E
A:
B:
C:
D:
E:

Year of manufacture (0 to 9)
Month of manufacture (1 to 9 for Jan.-Sep.; XYZ for Oct., Nov., Dec.)
Manufacturing lot
Serial number
Factory codes

2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Phone: +81-3-3966-1113
Fax: +81-3-3558-9110
E-mail: intdept@rikenkeiki.co.jp
Website: https://www.rikenkeiki.co.jp

14 /121

3 Product Configuration

3-1. Main unit and standard accessories

3
3

Product Configuration

3-1. Main unit and standard accessories
Unpack and check the product and accessories.
If anything is missing, contact Riken Keiki.

Main unit
For detailed information on the names and functions of the product parts and the LCD display, see “3-2.
Part names and functions” on page 17.

GX-3R Pro main unit

15 /121

3 Product Configuration

3-1. Main unit and standard accessories

Standard accessories
Lithium ion
battery unit
(BUL-3R)
×1

Charger
×1

Rubber protection
cover
×1

Hand strap
×1

Protects the productfrom impact if it is hit bysomething or dropped.

Alligator clip
×1

Calibration adapter(simple type)
×1

Used when attaching
the product to a pocket

Used to perform gas
calibration and bumptest.

* ATEX/IECEx specification
only* ATEX/IECEx
specification only

16 /121

3 Product Configuration

3-2. Part names and functions

3-2. Part names and functions
This section describes the names and functions of the various parts of the main unit and the battery unit. It
also describes the LCD display.

Main unit(4), (5)

(7)

(1)

(4)

(3)

(2)

(6)

(8)

Name

Main function
Displays information such as gas type and gas concentration.

(1)

LCD display(2)

POWER/MODE button

Turns power on and off. This button is also used to confirm
settings in setting mode.

(3)

AIR button

Performs air calibration in measurement mode. This button is
also used to select settings in setting mode.

(4)

Alarm LED arrays

The lamps flash red if an alarm occurs.

(5)

Infrared communication
portThis is used for data communication with a PC when using adata logger management program.

(6)

Buzzer sound opening

Emits operating and alarm sounds. (Do not block.)(7)

Battery charging contact

Contact for connecting the charger (EPU15-102-L6).

(8)

Sensors

Sensors are installed for detecting individual gases.

CAUTION Do not poke the buzzer or sensor openings with sharp-pointed items. Doing so may result in
ingress of water or foreign matter, resulting in malfunctions or damage to the product.
 Do not remove the panel sheet on the surface. This will negatively affect the waterproof anddustproof performance.
 Do not cover the infrared communication port with labels or stickers. This will prevent infraredcommunication.
 Do not block the buzzer sound opening with tape or other objects. This will prevent adjustmentof the internal pressure of the product, which may result in malfunctions.

17 /121

3 Product Configuration

3-2. Part names and functions

NOTE

 In this operating manual, buttons with multiple functions are described as follows in the operational
procedures:
Example: “POWER/MODE button” is described as follows:
・ POWER button when turning power on and off
・ MODE button when confirming settings

Battery unit
<Lithium ion battery unit (BUL-3R)>
Battery charging
contact

Main unit
connection
terminals

18 /121

3 Product Configuration

3-2. Part names and functions

LCD display(2)(9)(10) (3)(9) (10)

(1)
(4)
(5)

(6)

(7)

(8)

Display example

(2)

Name
Operating status
display
Clock display(3)

Battery level icon

(1)

(4)
(5)
(6)
(7)
(8)

Combustible gas
concentration
Carbon monoxide
concentration
Hydrogen sulfide
concentration
Oxygen concentration
Sulfur dioxide
concentration(9)

Buzzer volume icon

(10)Bluetooth on icon

Main function
Indicates the operating status. Blinks when normal.
Displays the time.
Indicates battery levels. See NOTE below for a guide to battery
level indications.
Displays gas concentrations as numerical readouts.
(The type of gas displayed depends on the specifications.)
The concentration readout is updated each second for sensors
other than the combustible gas sensor.
The combustible gas concentration readout is updated every fiveseconds (every 15 seconds for long-life battery operation).
Indicates the buzzer volume. See NOTE below for information on
the icons displayed.
Indicates that BLE (Bluetooth) is turned on.

NOTE Approximate battery levels are indicated as follows:
Sufficient
Low
Needs charging (replace the batteries).
The battery level icon will blink if battery levels drop even further.
 The buzzer volume icon indicates “HIGH” or “LOW” as follows:
Volume HIGH
Volume LOW
 If the bump test expiration date display setting is enabled, “✔” isdisplayed in the upper left of the LCD until the bump test expiration date.
For more information on the bump test expiration date display setting, see“6-4-4. Bump test setting” on page 60.
 If the long-life battery function is enabled, “L” is displayed in the upper leftof the LCD.
 “MAINTE” is displayed on the LCD when user mode is selected.
 The Bluetooth on icon indicates the following:
Communicating: Constantly displayed
Advertising:
Blinking at 1-second intervals
Stopped:Not displayed

19 /121

4 Alarm Activation

4-1. Gas alarm activation

4
4

Alarm Activation

4-1. Gas alarm activation<Alarm types>
A “gas alarm” is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints
shown in the following table: (Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H),
TWA alarm, STEL alarm, OVER alarm (over scale), and M OVER alarm (minus sensor failure).
Gas alarms are prioritized as follows:First alarm < second alarm < third alarm <TWA alarm < STEL alarm

M OVER alarm < OVER alarm < integrated alarm point <<ATEX/IECEx specifications default settings>
Measuredgas

Combustiblegas
HC or CH4

O2

CO

H2S

Measurement
range

0 to 100 ％LEL

0 to 25.0 %0 to 500 ppm

0 to 100.0 ppm

0 to 5.00 vol%0 to 10,000 ppm

Service range-

25.1 to 40.0 %501 to 2,000 ppm

100.1 to 200.0
ppm

5.01 to 10.00 vol%-Minimum
resolution

1 %LEL

0.1 %

1 ppm

0.1 ppm

0.01 vol%20 ppm

L alarm:
19.5 %
LL alarm:
18.0 %
H alarm:
23.5 %
OVER alarm:
40.0 %M OVER alarm:-1.0 vol%First alarm:
25 ppmSecond alarm:
50 ppmThird alarm:
1,200 ppm
TWA alarm:
25 ppmSTEL alarm:
200 ppm
OVER alarm:
2,000 ppm
M OVER alarm:-50 ppm

First alarm:
5.0 ppm
Second alarm:
30.0 ppm
Third alarm:
100.0 ppm
TWA alarm:
1.0 ppm
STEL alarm:
5.0 ppm
OVER alarm:
200.0 ppm
M OVER alarm:-10.0 ppm

First alarm:
0.50 vol%Second alarm:
3.00 vol%Third alarm:
3.00 vol%
TWA alarm:
0.50 vol%STEL alarm:
3.00 vol%OVER alarm:
10.00 vol%M OVER alarm:-0.50 vol%First alarm:
5,000 ppm
Second alarm:
5,000 ppm
Third alarm:
5,000 ppm
TWA alarm:
5,000 ppm
STEL alarm:
OVER alarm:
10,000 ppm
M OVER alarm:-1,000 ppm

Item

First alarm:
10 %LEL
Second alarm:
25 %LEL
Third alarm:
50 %LELOVER:
Alarm setpoint 100 %LELM OVER alarm:-10 %LEL

20 /121CO2

4 Alarm Activation

Item

Measuredgas

4-1. Gas alarm activation

SO2

Measurement
0 to 20.00 ppm
range
Service range 20.05 to 100.00 ppm
Minimum
0.05 ppm
resolution
First alarm:
2.00 ppm
Second alarm:
5.00 ppm
Third alarm:
100.00 ppm
TWA alarm:
Alarm setpoint 2.00 ppm
STEL alarm:
5.00 ppm
OVER alarm:
100.00 ppm
M OVER alarm:-10.00 ppm

NO2

HCN

PH3

NH3

0 to 20.00 ppm

0 to 30.0ppm

0 to 20.00 ppm

0 to 400.0 ppm

-

-

-

0 to 300.0 ppm

0.05ppm

0.1ppm0.01ppm

0.5ppmFirst alarm:
2.00 ppm
Second alarm:
4.00 ppm
Third alarm:
20.00 ppm
TWA alarm:
0.50 ppm
STEL alarm:
1.00 ppm
OVER alarm:
20.00 ppm
M OVER alarm:-2.00 ppm

First alarm:
10.0 ppm
Second alarm:
20.0 ppm
Third alarm:
30.0 ppm
TWA alarm:
0.9 ppm
STEL alarm:
4.5 ppm
OVER alarm:
30.0 ppm
M OVER alarm:-3.00ppm

First alarm:
0.30 ppm
Second alarm:
0.60 ppm
Third alarm:
1.00 ppm
TWA alarm:
0.30 ppm
STEL alarm:
1.00 ppm
OVER alarm:
20.00 ppm
M OVER alarm:-2.00 ppm

First alarm:
25.0 ppm
Second alarm:
35.0 ppm
Third alarm:
35.0 ppm
TWA alarm:
25.0 ppm
STEL alarm:
35.0 ppm
OVER alarm:
400.0 ppm
M OVER alarm:-30.0 ppm

NOTE

 The default settings are as described in the table above.
 The alarm setpoints indicated for the first alarm (WARNING), second alarm (ALARM), third alarm(ALARM H), TWA alarm, and STEL alarm in the table above can be changed. For information on
how to change the alarm setpoints, see “6-4-6. Alarm setpoint setting” on page 68.(For items with “-”shown, the setpoint cannot be changed.) M OVER alarm (minus sensor failure) alerts when the zero point dives to the minus side.
 When the alarm silence function is ON, only the buzzer sound can be stopped by pressing the
MODE button while the gas alarm is being issued. If a new gas alarm is issued after the buzzer
sound has stopped, the buzzer sound operation will resume. This function can be turned ON/OFF
using the optional Data Logger Management SW-GX-3R.

<Gas alarm buzzer sounding and lamp flashing patterns>
If a gas alarm occurs, the user is notified by the buzzer sounding, alarm LED array flashing, and vibration,in two stages.
The individual operations are as follows:
Alarm
type
Buzzersounding

First
alarm
Repeatedalternatingstrong andweak
beeps atabout 1second
intervals:“Beep,
beep”

Alarm
LED
array
flashing

Repeated
flashing at
about 1second
intervals

Vibration

Secondalarm
Repeatedalternatestrong andweak
beeps atabout 0.5second
intervals:“Beep,
beep,
beep,
beep”
Repeated
flashing at
about 0.5second
intervals

Third
TWA
STEL
alarm
alarm
alarm
Repeated
Repeated
Repeatedalternate
alternate
alternatestrong and strong and strong and
weak
weak
weak
beeps atbeeps atbeeps atabout 1about 0.5- about 1second
secondsecondintervals:
intervals:
intervals:“Beep,“Beep,“Beep,
beep”
beep”
beep,
beep,
beep”
Repeated
Repeated
Repeated
flashing at flashing at flashing at
about 0.5- about 1about 1second
secondsecondintervals
intervals
intervals
Vibration when alarm occurs

21 /121OVER
alarm
Repeatedalternatestrong andweak
beeps atabout 0.5second
intervals:“Beep,
beep,
beep,
beep”
Repeated
flashing at
about 0.5second
intervals

M OVERalarm
Repeatedintermittent
beeps atabout 1secondintervals:“Beep,
beep”

Repeated
flashing at
about 1second
intervals
None4 Alarm Activation

4-1. Gas alarm activation

For gases other than oxygen:“Alarm Pattern (H-HH-HHH)”

For oxygen: “Alarm Pattern (L-LL-H)”: 1-second interval: 0.5-second interval: 1-second interval: 0.5-second
i t
l
Reset

Reset

Third alarm setpoint

Third alarm setpoint

0First alarm
setpoint

0

Time

Time

Alarm lamp
BuzzerAlarm lamp
Buzzer<Gas alarm display>
If a gas alarm occurs, the alarm type is indicated and the corresponding gas concentration display blinks
on the LCD display.
If the detection range is exceeded (over scale), “OVER” blinks in the gas concentration display area.

Display example
Methane (CH4) concentration: 10 %LEL
First alarm triggered

Alarm First alarm
type
LCD “AL1”
display appears andthe gasconcentration
value blinks.

Secondalarm“AL2”
appears andthe gasconcentration
value blinks.

Third alarm

TWA
alarm
“AL3”
“TWA”
appears and appears andthe gasthe gasconcentration concentration
value blinks. value blinks.

STEL
alarm
“STEL”
appears andthe gasconcentration
value blinks.

OVER
alarm
“OVER”
appears and“OVER”
blinks in thegasconcentration
value displayarea.

M OVERalarm“M OVER”
appears and“-OVER”
blinks in thegasconcentration
value display
area.

WARNING A gas alarm indicates the presence of extreme danger. The user must take appropriate action
based on the situation.

NOTE

 Responses to an alarm can be checked using the alarm test in display mode. Note, however, thatthe gas concentration value will not blink in alarm tests.

22 /121

4 Alarm Activation

4-2. Fault alarm activation

4-2. Fault alarm activation
A fault alarm is triggered if an abnormality is detected in the product. (Self-latching)Fault alarm types include system abnormalities, clock abnormalities, battery voltage abnormalities, andsensor abnormalities.
If a fault alarm occurs, the user is notified by the buzzer sounding and alarm LED array flashing.
・ Buzzer sounding: Repeated intermittent beeps at about 1-second intervals “Beep-beep, beep-beep”
・ Alarm LED array flashing: Repeated flashing at about 1-second intervals
The following shows typical fault alarm displays.

FAIL SYSTEM

FAIL CLOCK

System abnormality

Clock abnormality

FAIL BATTERY
Battery voltage abnormality

Sensor abnormality

If a fault alarm occurs, determine the cause and take appropriate action.
If the problem lies with the product and the fault occurs repeatedly, contact Riken Keiki immediately.

NOTE

 For more information on malfunctions (error messages), see “ Troubleshooting” on page 103.
9

23 /121

4 Alarm Activation

4-3. Panic alarm

4-3. Panic alarm
A panic alarm is manually triggered by the user to notify those in the vicinity of abnormalities.

WARNING The panic alarm is intended to assist the user and those in the vicinity to make appropriate
decisions. The detection results are not intended to assure life or safety. Do not depend solely on
this function when using the product.
 Use the panic alarm appropriately after assessing the situation.

Panic alarm buzzer sounding and lamp flashing patterns
Alarm type
Buzzersounding
Alarm LEDarray
flashing

Prealarm
Repeated intermittent beeps at about 0.5second intervals:“Blip, blip, blip, blip”

Main alarm
Repeated alternate strong and weak
beeps at about 1-second intervals:“Beep, beep, beep, beep”

Repeated flashing at about 0.5-second
intervals.

Repeated flashing at about 1-second
intervals.

Panic alarm activation and alarm pattern
If you sense any abnormality, rapidly strike the product twice to trigger a panic alarm.
In case of a panic alarm, the main alarm is triggered after a 5-second prealarm.

NOTE To stop a panic alarm prealarm or main alarm, press the AIR button or the MODE button.

24 /121

4 Alarm Activation

4-4. Man down alarm

4-4. Man down alarm
A man down alarm is triggered if the built-in motion sensor, which monitors the motion of the user carrying
the product, detects no user motion for a certain period of time.

WARNING The man down alarm is intended to assist those in the vicinity of the user to make appropriate
decisions. The detection results are not intended to assure life or safety. Do not depend solely on
this function when using the product.
 Use the man down alarm appropriately after assessing the situation.

Man down alarm buzzer sounding and lamp flashing patterns
Alarm type

Prealarm 1

Prealarm 2

Main alarm

Buzzersounding

Repeated intermittent
beeps at about 1 second
intervals:“Blip, blip”
Repeated flashing at about
1-second intervals

Repeated intermittent
beeps at about 0.5-second
intervals:“Blip, blip, blip, blip”
Repeated flashing at about
0.5-second intervals

Repeated alternate strong
and weak beeps at about
1-second intervals:“Beep, beep, beep, beep”
Repeated flashing at about
1-second intervals

Alarm LEDarray
flashing

Man down alarm display and alarm patterns
If no user motion has been detected for a certain period, the lamps flash
and alarms are triggered while vibrating in the following sequence:
prealarm 1, prealarm 2, and main alarm
When a main alarm is triggered, “MAN DOWN” appears at the bottom of
the LCD screen.
The following shows the default setting times for switching from the prealarmto the main alarm:
・ Prealarm 1: 60 seconds after detection
・ Prealarm 2: 75 seconds after detection
・ Main alarm: 90 seconds after detection

NOTE

MAN DOWN

 The man down prealarms are stopped and measurement mode is resumed if user motion isdetected.
 To stop the man down main alarm, press the AIR button or the MODE button.
 You can adjust the duration for which no user motion is detected before a man down alarm istriggered. For information on how to change the man down alarm time, see “6-4-5. Man down alarm
setting” on page 66.

25 /121

5 Usage Instructions

5-1. Before using the product

55Usage Instructions

5-1. Before using the product
The operating precautions apply to both first-time users and those who have previously used the product.
Ignoring these precautions may damage the product and result in inaccurate gas detection.

5-2. Preparing startup
Check the following before starting gas detection:
・ Confirm that the battery level is sufficient.
・ Confirm that the filter inside the product is neither contaminated nor clogged.

NOTE

 If the settings for the product were altered from an external device, be sure to confirm that thesettings have been altered correctly.

5-2-1. Charging and attaching the lithium ion battery unit
(BUL-3R)
Before using the product for the first time or if battery levels of the rechargeable battery in the lithium ion
battery unit are low, charge using the provided charger, as described below.

DANGER Replace the lithium ion battery unit only in a safe place.
 Charge the battery using the provided charger in a safe place.
 Charge the battery at ambient temperatures between 0 °C and 40 °C.

CAUTION Be sure to turn off the power for the product before replacing the battery unit.
 Do not use the product while charging the battery. The measurements obtained will not be correct.
Additionally, doing so will degrade the rechargeable battery more quickly and reduce battery life.
 The charger is neither waterproof nor dustproof. Do not charge the battery while the product is wet.
 The charger is not explosion-proof.
 After attaching the lithium ion battery unit, use screws to attach securely. If the screws are notsecurely tightened, the battery unit may fall off unexpectedly or water may get in through gaps.
 Avoid damaging the rubber seal.
 To maintain waterproof and dustproof performance, we recommend replacing the rubber seal
every three to six years, regardless of condition.
 Always unplug the charger from the outlet when not in use.
 Do not touch the main unit connection terminals on the battery unit with bare hands. Doing so may
cause contact failure.
 Do not short-circuit the connection terminals with metal objects. The battery will overheat or battery
levels will drop sharply.
26 /121

5 Usage Instructions

5-2. Preparing startup

NOTE If the screws are not fully tightened, the battery unit may fall off unexpectedly or water may get inthrough gaps. Water may also get in if minute foreign matter is trapped beneath the battery unit.
 The lithium ion battery unit may get hot during charging. This is not an abnormality.
 The main unit will grow warmer while charging. Once charging is completed, wait at least 10 minutes
before use. Using the product while still hot may result in incorrect measurements.
 When fully charged, the battery cannot be charged.
 Always unplug the charger from the outlet when not in use.
 If the battery unit is removed for extended periods, the date and time setting will be reset.
 Do not touch the main unit connection terminals on the battery unit with bare hands. There is a risk ofcontact failure due to contamination or damage to internal components due to static electricity.

<Charging the lithium ion battery>1

Insert the DC plug of thecharger into the battery
charging contact of themain unit.
Insert the DC plug cable from the
top of the main unit aligning with thegroove.

2

Plug the charger into theoutlet.
When the charger is connected, thecharging indicator lamp lights up ingreen. When charging starts, thelamp lights up in orange. (Fullcharge requires about three hours
at maximum.)Once charging is completed, thecharging indicator lamp lights up ingreen.

3

Charging indicator lamp

Unplug the charger fromthe outlet when charging
is complete.

27 /121

5 Usage Instructions

5-2. Preparing startup<Removing/attaching the lithium ion battery unit>
1

Confirm that the power forthe main unit is turned off.
If the power is on, press the
POWER button to turn it off.

2

Loosen the four screws
securing the battery unit,
then remove the lithium
ion battery unit from themain unit.

3

When attaching thelithium ion battery unit,
secure with the fourscrews.
Make sure the rubber seal is neither
misaligned nor detached from themounting surface.
The screws should be tightenedwith torque of 15 to 16 N・cm.

28 /121

5 Usage Instructions

5-3. Startup

5-3. Startup
When the power is turned on, various settings including date and time and alarm setpoints are displayed,
and then the measurement mode screen is displayed.

Turning on the power
Hold down the POWER button (for atleast 5 seconds) until the buzzer blips.
The power turns on.

The entire LCD display lights up.

NOTE When the power is turned on, the LCD, lamps, and buzzer start to operate and the productvibrates. Before using the product, check that these operations function correctly.

29 /121

5 Usage Instructions

5-3. Startup

Screen transition from powering on to displaying
measurement screen
When the power is turned on, the LCD display changes automatically as shown below before themeasurement screen is displayed.
<Display examples: Default settings> ( about 40 seconds )YYYY/MM/DD
DATE
Calibration expiration
date display

Date and time display* Displayed on ATEX/IECEx
specification only

LATCHING
Li-ionBattery voltage display

Detection target gas
display

Full scale display

First alarm setpoint
display

Second alarm setpoint
display

Third alarm setpoint
display

STEL alarm setpoint
display

TWA alarm setpoint
display

Measurement screen
The buzzer blips twice
and then themeasurement screen isdisplayed.

CAUTION Only for ATEX/IECEx specification
When the calibration date has expired, indicates that the calibration has expired when the power isturned on. The operation after calibration expiration depends on its setting.
For information on the calibration procedure, see “7-2. Calibration” on page 83.
CONFIRM: Allows the user to confirm and select whether to proceed to measurement mode or
to Auto calibration cylinder setting.
CANT USE:Measurement mode is not available. Proceed to Auto calibration cylinder setting bypressing the button or after 6 seconds.
NO EFFECT: Indicates that calibration has expired and allows the user to select whether toproceed to Auto calibration cylinder setting by pressing the button or to measurementmode after 6 seconds when there is no action.
30 /121

5 Usage Instructions

5-3. Startup

CAUTION When the bump test date has expired, indicates that the bump test date has expired when the
power is turned on. The operation after bump test expiration depends on its setting.
For information on the bump test procedure, see “7-3. Bump test” on page 94.
CONFIRM: Allows the user to confirm and select whether to proceed to measurement mode or
to Bump test cylinder setting.
CANT USE:Measurement mode is not available. Proceed to Bump test cylinder setting bypressing the button or after 6 seconds.
NO EFFECT: Indicates that calibration has expired and allows the user to select whether toproceed to Bump test cylinder setting by pressing the button or to measurement mode
after 6 seconds when there is no action.
 With models that detect combustible gases, the screen shown on the right
READ GAS
may be displayed with the buzzer sounding and lamp flashing after thebattery level and alarm patterns are displayed. When the screen shown
LIST INon the right is displayed, the alarm is automatically cleared by pressing
MANUALthe MODE button or after 5 seconds.
 The screen shown on the right is displayed when the combustible gas sensor is poisoned bysilicone compounds, halides, or other substances. When the screen shown on the right isdisplayed, the combustible gas conversion function can be used only for the gas types marked with
"" in the "Conversion when conversion is restricted" column in the "Conversion gas list" section of"6-2-2. Combustible gas conversion setting.” If you wish to continue to use the combustible gas
conversion function for gas types marked with "×", please contact Riken Keiki.
 If a gas that cannot be converted has been set, this will automatically return to the calibration gas.
 If any abnormality is detected in the sensor, “FAIL” appears in place of the measured value justbefore the measurement screen is displayed, and a sensor abnormality alarm is triggered. If thisoccurs, press the MODE button to temporarily reset the sensor abnormality alarm. However, thealarm cannot be reset if there is an abnormality in all of the sensors. After the alarm is reset, “- - -” appears in the concentration display area of the gas for which the sensor abnormality occurred,and detection will not be possible for that gas type. Contact Riken Keiki immediately.
 After startup, perform “5-4. Air calibration” on page 33.

31 /121

5 Usage Instructions

5-3. Startup

NOTE If there is an abnormality in the built-in clock, a “FAIL CLOCK” fault alarm may be triggered. If thisoccurs, press the MODE button. The fault alarm will be temporarily reset, and measurement will bestarted with the clock time remaining incorrect.
Lunch break
When the lunch break setting is enabled, the screen is displayed with a five-second countdown toallow the user to confirm whether to retain the TWA and PEAK values from the last time the power
was turned off and continue measurement or to reset the values when the power is turned on.
Pressing the MODE button retains the measurement data, and pressing the AIR button resets themeasurement data.
Bump test expiration date
When the bump test expiration date setting is enabled, the number of days remaining after the lastbump test date until a specified setting date is displayed when the power is turned on. For
information on the bump test expiration date setting, see “6-4-4. Bump test setting” on page 60.
Calibration notification display
With ATEX/IECEx specifications only, the calibration expiration date appears when the power isturned on. The calibration expiration date display indicates the number of days remaining after thelast calibration date until a specified setting date. For details, see “6-4-3. Calibration expiration datesetting” on page 56.
Date and time
Displays the date and time. For information on the date/time setting and display format, see “6-4.
User mode settings” on page 56. If an IrDA communication partner device is brought close to the
product, it switches to communication mode. Pressing the AIR and MODE buttons together also
switches to communication mode, even when no communication partner device is nearby.
Battery level/alarm pattern
Displays the battery level (voltage) in the upper part of the screen.
Displays the gas alarm pattern setting (LATCHING <self-latching>) in the center of the screen.
Indicates the type of battery used (lithium ion battery) at the bottom of the screen.
Detection target gas
Displays the detection target gas. The gas currently being converted is displayed at the bottom of
the screen if a combustible gas is being converted.
If an IrDA communication partner device is brought close to the product, it switches tocommunication mode. Pressing the AIR and MODE buttons together also switches tocommunication mode, even when no communication partner device is nearby.
Full scale
Displays the full-scale value of the detection target gas. IEC or ISO is displayed in the full-scale
display area if IEC or ISO LEL values are set.
First alarm setpoint
Displays the first alarm setpoint for the detection target gas.
Second alarm setpoint
Displays the second alarm setpoint for the detection target gas.
Third alarm setpoint
Displays the third alarm setpoint for the detection target gas.
STEL alarm setpoint (TWA and STEL are displayed only for models that detect gases other than
combustible gases and oxygen.)
Displays the STEL alarm setpoint for the detection target gas. The STEL value refers to theconcentration of a toxic substance that does not adversely affect the user’s health with 15-minutecontinuous exposure, provided that daily exposures do not exceed the TWA value.
TWA alarm setpoint (TWA and STEL are displayed only for models that detect gases other than
combustible gases and oxygen.)
Displays the TWA alarm setpoint for the detection target gas. The TWA value refers to the timeweighted average concentration limit of a toxic substance for a normal 8-hour workday and a 40-hour
workweek to which almost all users may be repeatedly exposed without adverse health effect.

32 /121

5 Usage Instructions

5-4. Air calibration

5-4. Air calibration
Air calibration refers to zero adjustment required to ensure accurate measurement of gas concentrations.

WARNING When air calibration is performed in the atmosphere, check the atmosphere for freshness before
starting. The presence of interference gases will make it impossible to perform air calibration
correctly and potentially result in hazardous conditions in the event of actual gas leaks.

CAUTION After startup, perform air calibration before using the product for gas detection.
 Always perform air calibration under conditions of pressure, temperature, and humidity similar to
those in the operating environment and in fresh air.
 Wait for the readout to stabilize before performing air calibration.
 If there is a temperature difference of 15 °C or more between the storage and usage locations, turnon the power and allow the product to stand and acclimatize for about 10 minutes (about 30
minutes if the product is equipped with an ammonia (NH3) sensor) in an environment similar to theusage location before performing air calibration in fresh air.
By default, air calibration is not performed for the CO2 sensor. You can enable air calibration for
the CO2 sensor by setting the CO2 sensor air calibration setting to ON in user mode. For
information on how to change the setting, see “6-4-14. CO2 sensor air calibration: ON/OFF” onpage 76. Air calibration adjusts to 400 ppm. Confirm that the surrounding air is fresh. Note that the
product will not perform to standard product specifications if you perform air calibration with thissetting.

NOTE

 When using the combustible gas conversion function with the long-life battery setting ON, in
principle, the indicated value may rise temporarily after power-on, and depending on the alarm
setting value, a gas alarm may be issued. Please wait about 5 minutes after power-on and perform
air calibration before use.
In particular, Toluene, Xylene, N-nonane, or Methyl isobutyl ketone tend to rise comparatively, so it
is recommended to use the product with the long-life battery setting OFF.

Air calibration procedure1

Hold down the AIR button on themeasurement screen.

The air calibration screen appears.
Keep the AIR button pressed for as long as thescreen shown on the right is displayed.
Air calibration will not be performed if you release
the button before the screen is displayed or while itis displayed.

33 /121

HOLD AIR KEY
AIR CAL

5 Usage Instructions

2

5-4. Air calibration

Release the AIR button once thescreen shown on the right appears.

ADJUSTING ZERORELEASEIf air calibration has been successfully completed,the display automatically returns to themeasurement mode screen.

NOTE If air calibration fails, “FAIL” appears in the concentration display area for the faulty sensor. Press
the MODE button to reset the fault alarm (calibration failure). Resetting the alarm displays the value
before calibration.

34 /121

5 Usage Instructions

5-5. Gas detection

5-5. Gas detection
DANGER If measuring inside manholes or enclosed spaces, never lean over or look into the manhole or
enclosed space. There is a danger that oxygen-deficient air or other gases may be discharged
from such locations.

WARNING When air calibration is performed in the atmosphere, check the atmosphere for freshness before
starting. The presence of interference gases will make it impossible to perform air calibration
correctly and potentially result in hazardous conditions in the event of actual gas leaks.
 A gas alarm indicates the presence of extreme danger. The user must take appropriate action
based on the situation.
 If the battery voltage drops, gas cannot be detected. If a low battery voltage alarm occurs duringuse, turn off the power and promptly charge or replace the batteries in a safe place.
 Do not block the buzzer sound opening. Doing so will make the alarm hard to hear.

CAUTION Check the settings before starting gas detection.
 When equipped with a carbon dioxide (CO2) sensor, it may show a high indication immediately
after energization due to the characteristics of the sensor
You Warm it up for about 10 to 20 minutes and use it after instructions are stable.
 When an ammonia (NH3) sensor is installed, the indication may rise temporarily immediately after
the sensor is energized due to its characteristics. When replacing the battery before it runs out,
please wait at least 10 minutes before turning the power back on. Also. When the sensor is replaced,
the battery is replaced because it is dead, or the battery is removed and has not been used for along period of time, turn the power back on after 120 minutes or more.

35 /121

5 Usage Instructions

5-5. Gas detection

5-5-1. Basic operating procedures
Turn on the power to proceed to the measurement mode screen.
<Measurement mode><Air calibration><Display mode>

Hold down

HOLD AIR KEY
AIR CAL<Gas alarm state><Fault alarm state>

Measuredvalue
blinking(Self-latching (reset after turning
off the power))(Self-latching (reset after recovery tonormal state))

36 /121

5 Usage Instructions

5-5. Gas detection

5-5-2. Measurement mode
In measurement mode, read the values on the LCD display.
Carbon monoxide

Combustible gas(%LEL)

HydrogensulfideOxygenSulfur dioxide

Display example

CAUTION Note that if combustible gas sensors are used in an environment where silicone compounds,
halides, high concentrations of sulfides, or high concentrations of solvent gases are present,
sensor life may be reduced, sensitivity to combustible gases may deteriorate, and accurate
readings may not be obtained. If use in such environments is unavoidable, use for the shortest
possible time and allow the product to stand in fresh air after use. Confirm that the reading
returns to normal and is stabilized.
 An oxygen concentration higher than a certain level is required in order for the combustible gas
sensor <%LEL> in the product to correctly detect gases and display concentrations.
 Do not expose the product to sudden pressure fluctuations. Oxygen readings will vary
temporarily, preventing accurate measurement.
 Do not use any gas other than nitrogen as the balance gas when calibrating or adjusting an
oxygen sensor. Otherwise, oxygen reading errors will increase, preventing accurate
measurement.
 If the product is exposed to highly adsorptive gas, allow it to stand in fresh air. Confirm that thereading returns to zero before use.
 The zero point for carbon monoxide (CO) and hydrogen sulfide (H2S) sensors may fluctuate at low
or high temperatures. If this occurs, perform air calibration in the ambient atmosphere.
 The hydrogen sulfide (H2S) sensor may exhibit temporary fluctuations if exposed to sudden
temperature variations. Allow the product to stand and acclimatize in the ambient atmosphere.

NOTE

 The gas currently being converted is displayed at the bottom of the screen if a combustible gas is
being converted.
 The operating time will be reduced due to battery performance in cold environments.
 The response of the LCD display may slow at low temperatures.
If the product is exposed to a combustible gas at concentrations of 100 %LEL or above, someadsorbed gas may remain in the filter. After drawing in high-concentration combustible gas, always
allow the product to stand in fresh air. Perform air cleaning until the reading returns to around zero
to remove any adsorbed gases. Performing air calibration before a complete cleaning will result ininaccurate adjustments, with potential adverse effects on measurement. Locking over will occur if
100 %LEL is detected. This will not be reset until either the oxygen concentration decreases or youpress the MODE button.
 The toxic gas sensor zero point may fluctuate when the temperature is low or high.
 The ammonia (NH3) sensor may show temporary fluctuations in indication in response to suddenchanges in humidity*. Allow the sensor to acclimate sufficiently in an ambient atmosphere before
turning it on again.
*e.g., entering a room from outdoors when it's raining, covering the sensor with your hand.

37 /121

5 Usage Instructions

5-5. Gas detection

 The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce interference due
to hydrogen. This function works for hydrogen concentrations up to 2,000 ppm. However, if used in
an environment exceeding 40°C for more than 15 minutes, it may be affected by hydrogeninterference and may indicate a higher carbon monoxide concentration than actual.
 If the carbon monoxide sensor (ESR-A1CP) detects hydrogen at a concentration of 2,000 ppm or
higher, [H2] and [RICH] are displayed alternately in the concentration display area. Whilemeasurement can continue, errors will arise with carbon monoxide concentration readings due tothe significant effects of hydrogen interference..

Concentration display: RICH
Concentration display: H2
 Sensitivity may be reduced temporarily if the carbon monoxide (CO) and hydrogen sulfide (H2S)
sensors come into contact with gas at concentrations exceeding their measurement range. If thesensors have come into contact with high-concentration gas, be sure to allow them to stand in fresh
air and perform air cleaning.
 The display will not switch to display mode if an alarm is currently active.
 If you are measuring for 20 minutes or more outside the operating temperature range, temperature
range error will be triggered. If temperature range error is triggered, leave it for 5 minutes or more
within the operating temperature range or turn off the power of the main unit.

38 /121

5 Usage Instructions

5-6. Turning off the power

5-6. Turning off the power
CAUTION If the concentration display does not return to zero (or 20.9 % for the oxygen concentration
display) after measurement is completed, allow the product to stand in fresh air until the display
returns to zero before turning power off.

Hold down the POWER button.
To turn off the power, wait for the display to return to zero (or20.9 % for oxygen) in a safe place, then hold down the
POWER button.

The buzzer blips three times and “TURN OFF” appears on
the display before the power turns off.

TURN OFFPower-off display

NOTE When turning off the power, hold down the button until the display turns off.

CAUTION If the product has become dirty, wipe it with a rag or cloth soaked in water and firmly wrung out.
 When wiping the product clean, do not use organic solvents like alcohol or benzine orcommercially available cleaners.

39 /121

6 Setting Procedure

6-1. Display mode

6
6

Setting Procedure

6-1. Display mode
Display mode lets users review and change various display settings and perform other operations.
Changed settings are saved.

6-1-1. Displaying display mode
Press the MODE button on the measurementmode screen.
Pressing the MODE button displays the various screens insequence.

To change a setting, press the AIR button.
The setting screen is displayed.

Press the MODE button once settings arecomplete.

The settings are saved and the display returns to the previous
screen.

To return to the measurement mode screen,press the MODE button several times indisplay mode.

NOTE If no action is taken for about 20 seconds, the display will return to the measurement screen.
 To test the alarm, press the AIR button and MODE button at the same time while an alarm setpoint
is displayed.
 Hold down the AIR button and MODE button at the same time in display mode to return tomeasurement mode.
 To cancel before finalizing changes to the settings, hold down the AIR button and MODE button at
the same time. The display returns to display mode.

6-1-2. Display mode display details
Screen notation(Setting item)

Display contents

PEAK(PEAK display/PEAK
reset)

Displays the maximum
gas concentration (orminimum oxygen
concentration)
detected since thepower was turned on.

LCD display

40 /121

Reference page
Hold down the AIR
button to jump to
the PEAK CLEAR
screen on page 43.

6 Setting Procedure
Screen notation(Setting item)

STEL(STEL display)* Displays only CO, H2S,
SO2, NO2, HCN, PH3, NH3
and CO2 (vol%)TWA(TWA display)* Displays only CO, H2S,
SO2, NO2, HCN, PH3 and
CO2HC GAS LIST
(Combustible gas
conversion setting)* Displayed only on models
that detect combustible
gases.

LONG LIFE BATT(Long-life battery
setting)* Displayed only on models
that detect combustible
gases.

CAL DATA(Calibration data
display)* Displayed on ATEX/IECEx
specification only

6-1. Display mode

Display contents

LCD display

Displays the STEL
value since the power
was turned on.
The STEL value refers
to the sum of 15
pieces of averagevalue data formeasured values overa period of 60 seconds
divided by 15.
The value is refreshed
every 60 seconds.
Displays the TWA
value since the power
was turned on.
The TWA value refers
to the integrated
average value of
measured values overa period of 60 seconds
divided by 480.
The value is refreshed
every 60 seconds.
Selects the conversion
gas from the list ofgases preregistered in
the product.

Enables/disables thelong-life battery
function.

-----

-----

CHANGEHC GAS LIST

Press the AIR
button to jump to
the setting screen
on page 44.

OFF
NO
LONG LIFE BATT

Press the AIR
button to jump to
the setting screen
on page 46.
Press the AIR
button to jump to
the setting screen
on page 47.

Displays the calibrated
gas type and thecalibration date.

BUMP DATA(Bump data display)

Displays the bump test
gas type and the test
date.

DATE
(Date and time andtemperature display)

Displays the date,time, and temperature.

ALARM POINTS(Alarm setpoint
display)

Displays various alarm
setpoints.

Reference page

CHANGENOBUMP DATA

Press the AIR
button to jump to
the setting screen
on page 48.

YYYY/MM/DD
-----

DATE

41 /121YESNO
ALARM POINTS

Press the AIR
button to jump to
the confirmation
screen on page 49.

6 Setting Procedure
Screen notation(Setting item)

6-1. Display mode

Display contents

LCD display

Reference pageOFF
CHANGE
INVERT SELECT

Press the AIR
button to jump to
the setting screen
on page 50.

INVERT SELECT(LCD inversion
setting)

Inverts the LCD
display by 180
degrees depending on
the orientation of the
product.

LCD BACKGROUND(LCD backgroundinversion)

Inverts black and white
for the LCD display.

OFF
CHANGELCD BACKGROUND

Press the AIR
button to jump to
the setting screen
on page 51.

BLUETOOTH(Bluetooth setting)

Enables/disables
Bluetooth.

OFF
CHANGEBLUETOOTH

Press the AIR
button to jump to
the setting screen
on page 51.

BUZZER VOLUME(Buzzer volume
adjustment)

Adjusts the alarmbuzzer volume.

HIGHNO
BUZZER VOLUME

Press the AIR
button to jump to
the setting screen
on page 52.

LANGUAGE CHANGE(Display lanquagechange)* Displayed on ATEX/IECEx
specification only

Restores the English
language display whenanother language has
been set.

NOTE

Press the AIR
button to jump to
the setting screen
on page 52.

 The previously measured PEAK and TWA values retained the last time the power was turned off aredisplayed when the lunch break function is enabled.
 HC GAS (combustible conversion gas selection) is not displayed for calibration gas types other thanCH4 or i-C4H10.
 Bump data is displayed if the bump test expiration date display is enabled in user mode.
 Calibration data is displayed if the calibration expiration date display is enabled in user mode.
 The temperature displayed in the date and time and temperature display is the internal temperatureof the product. This value differs from the actual ambient temperature.

42 /121

6 Setting Procedure

6-2. Display mode settings

6-2. Display mode settings
Switch to display mode from the measurement screen and check and change settings in display mode.

6-2-1. Clearing PEAK value display
This clears the PEAK value (the maximum gas concentration or minimum oxygen concentration measured
since the power was turned on).

1

Press the MODE button on the measurement screen to display the
PEAK screen.

2

Hold down the AIR button (for threeseconds).

HOLD AIR KEY
PEAK CLEAR

3

Release the AIR button once the“RELEASE” is displayed on the screen.

RELEASEPEAK CLEAR

The PEAK value is cleared and “END” appears andthe display returns to the screen in Step 1.

43 /121

6 Setting Procedure

6-2. Display mode settings

6-2-2. Combustible gas conversion setting
Combustible gas measurements can be displayed as a concentration converted to a gas preregistered in
the product.
The following combustible gases can be converted:<Conversion gas list>
Gas conversion
Conversion gas
MethaneIsobutane
Hydrogen
Methanol
Acetylene
Ethylene
EthaneEthanol
Propylene
AcetonePropaneButadiene
Cyclopentane
Benzenen-HexaneToluenen-Heptane
Xylenen-Nonane
Ethyl acetate
Isopropyl alcohol
Methyl ethyl ketone
Methyl methacrylate
Dimethyl ether
Methyl isobutyl ketone
Tetrahydrofurann-Pentane

Gas name
displayed

CH4

i-C4H10CH4
i-C4H10
H2
CH3OH
C2H2
C2H4
C2H6
C2H5OH
C3H6
C3H6O
C3H8
C4H6
C5H10
C6H6
n-C6H14
C7H8
n-C7H16
C8H10
n-C9H20
EtAc
IPA
MEK
MMA
DME
MIBK
THF
n-C5H12




























×




×



×

















Conversion
whenconversion isrestricted



×



×

×



×

×

×
×
×
×
×
×
×
×
×


CAUTION On models that detect combustible gases, the screen shown on the right
READ GAS
may be displayed with the buzzer sounding and lamp flashing after the
LIST IN
power is turned on or calibration is performed. When the screen shown on
the right is displayed, the alarm is automatically cleared by pressing the
MANUAL
MODE button or after 5 seconds.
 The screen shown on the right right is displayed when the combustible sensor is poisoned bysilicone compounds, halides, or other substances. When the screen shown on the right isdisplayed, the combustible gas conversion function can be used only for the gas types marked with
"" in the "Conversion when conversion is restricted" column in the "Conversion gas list" section of"6-2-2. Combustible gas conversion setting.” If you wish to continue to use the combustible gas
conversion function for gas types marked with "×", please contact Riken Keiki.

44 /121

6 Setting Procedure

6-2. Display mode settings

NOTE

 Combustible gas conversion setting is displayed for CH4 and i-C4H10.
 This does not appear if “Display mode item display: ON/OFF” is disabled in user mode.
 To cancel before finalizing changes to the settings, hold down the AIR button and MODE button at
the same time. The display returns to display mode.
 The alarm accuracy and alarm delay time shown in the specifications list apply only for thecalibration gas.
 The concentration display when converted should be treated as approximate.
 If conversion is used, the indication accuracy for the product will not be achieved.
 The combustible gas sensor of this instrument may not be able to use the combustible gas
conversion function for some gases according to its specifications. Check the gas monitor
specifications in "1-3. Checking the detection target gases" and confirm whether the gas can beread or not in the "Conversion gas list" in "6-2-2. Combustible gas conversion setting.” Even if a
combustible conversion gas is selected, the indicated value will be affected if other combustible
gases are present in the usage environment. However, if hydrogen (H2) is selected as theconversion gas, the gases with "×" in the "Conversion when the conversion is restricted" column ofthe "Conversion gas list" do not affect the indicated value even if they are present in the operating
environment.
 When using the combustible gas conversion function with the long-life battery setting ON, in
principle, the indicated value may rise temporarily after power-on, and depending on the alarm
setting value, a gas alarm may be issued. Please wait about 5 minutes after power-on and perform
air calibration before use.
In particular, Toluene, Xylene, N-nonane, or Methyl isobutyl ketone tend to rise comparatively, so it
is recommended to use the product with the long-life battery setting OFF.

1

2

Press the MODE button on
the measurement screen
several times to display
the HC GAS LIST screen.

CHANGEHC GAS LIST

Press the AIR button several times to display the combustible gas you
want to change.
Pressing the AIR button toggles through the list of
combustible gases.
The default setting is the calibration gas for the
combustible gas sensor.

3

NO
HC GAS LIST

Press the MODE button when the combustible gas
to be changed is displayed on the screen.
“END” appears and the display returns to the screen in Step 1.

45 /121

HC GAS LIST

6 Setting Procedure

6-2. Display mode settings

6-2-3. Long-life battery settingThis enables/disables the LONG LIFE BATT setting. The default setting is “OFF”.
When set to “ON”, the combustible gas concentration is refreshed every 15 seconds instead of every 5
seconds.

NOTE

 The setting is retained even when the power is turned off.
 This does not appear if “Display mode item display: ON/OFF” is disabled.
 If LONG LIFE BATT is enabled, no minus sensor alarm will be issued for the combustible gas
sensor.
 The “L” lights up at the top left of the screen when LONG LIFE BATT is enabled.
 When using the combustible gas conversion function with the long-life battery setting ON, in
principle, the indicated value may rise temporarily after power-on, and depending on the alarm
setting value, a gas alarm may be issued. Please wait about 5 minutes after power-on and perform
air calibration before use.
In particular, Toluene, Xylene, N-nonane, or Methyl isobutyl ketone tend to rise comparatively, so it
is recommended to use the product with the long-life battery setting OFF.

1

2

Press the MODE buttonon the measurement
screen several times todisplay the LONG LIFE
BATT screen.

OFF
CHANGELONG LIFE BATT

Press the AIR button to
select “ON” or “OFF”.
The default setting is “OFF”.

3

Press the MODE button.
“END” appears and the display returns to the screen in Step 1.

46 /121OFFNO
LONG LIFE BATT

6 Setting Procedure

6-2. Display mode settings

6-2-4. Calibration data display
This displays the calibrated gas type and the calibration date.

NOTE Calibration data is not displayed if the calibration expiration date setting is disabled in user mode.
 Calibration data is displayed only on ATEX/IECEx specification.

1 Press the MODE button on the measurement screen several times todisplay the CAL DATA screen.
2 Press the AIR button.
CHANGE AIR
NO MODECAL DATA
Pressing the AIR button cycles the display through “CH4” → “O2” → “H2S” → “CO” → “CO2” → ...

YYYY/MM/DDCAL DATAYYYY/MM/DDCAL DATAYYYY/MM/DDCAL DATAYYYY/MM/DDCAL DATA

3 Press the MODE button.
“END” appears and the display returns to the screen in Step 1.

47 /121YYYY/MM/DDCAL DATA

6 Setting Procedure

6-2. Display mode settings

6-2-5. Bump data display
This displays the bump test expiration function bump test expiration date and gas type.

NOTE

 Bump data is not displayed if the bump test expiration date setting is disabled in user mode.

1

Press the MODE button on the measurement screen several times todisplay the BUMP DATA screen.

2

Press the AIR button.
YESNO
BUMP DATA
Pressing the AIR button cycles the display through “CH4” → “O2” → “H2S” → “CO” → “CO2” → ...

YYYY/MM/DD

YYYY/MM/DD

YYYY/MM/DD

BUMP DATABUMP DATABUMP DATAYYYY/MM/DD

YYYY/MM/DD
CO2

BUMP DATA
3BUMP DATA

Press the MODE button.
“END” appears and the display returns to the screen in Step 1.

48 /121

6 Setting Procedure

6-2. Display mode settings

6-2-6. Alarm setpoint display
This allows alarm setpoints to be displayed and testing of LED, buzzer, and vibration operations.

NOTE TWA and STEL are displayed only on models that detect gases other then combustible gases andoxygen.

1 Press the MODE button on the measurement screen several times todisplay the ALARM POINTS screen.
2 Press the AIR button.
YESNO
ALARM POINTS
Pressing the AIR button cycles the display through “FULL SCALE” → “WARNING” → “ALARM” →“ALARM H” → “STEL” → “TWA” → “FULL SCALE” → ...

The corresponding alarm can be tested by pressing the AIR button and MODE button at the sametime. Press any button to reset the alarm.

3 Press the MODE button.
The display returns to the screen in Step 1.

49 /121

6 Setting Procedure

6-2. Display mode settings

6-2-7. LCD inversion settingThis flips the LCD display 180 degrees as follows, depending on the orientation of the product:
“ON”
“OFF”
“AUTO”

Displays the screen inverted 180 degrees to the orientation of the product.
Displays the screen in the same orientation as the product.
Switches the screen display depending on the orientation of the product.

NOTE The setting is retained even when the power is turned off.
 This does not appear if “Display mode item display: ON/OFF” is disabled in user mode.

1 Press the MODE button on the measurement screen several times todisplay the INVERT SELECT screen.
2 Press the AIR button.
OFF
CHANGE
INVERT SELECTOFFNO
INVERT SELECT

Pressing the AIR button cycles the display through “ON” → “OFF” → “AUTO” → ...
The default setting is “OFF”.

ON

OFF
INVERT SELECT

INVERT SELECT

3 Press the MODE button.
“END” appears and the display returns to the screen in Step 1.

50 /121

AUTO
INVERT SELECT

6 Setting Procedure

6-2. Display mode settings

6-2-8. LCD background settingThis inverts black and white for the LCD display to display white letters on a black background.

NOTE The setting is retained even when the power is turned off.
 This does not appear if “Display mode item display: ON/OFF” is disabled in user mode.

1

Press the MODE button on the measurement screen several times todisplay the LCD BACKGROUND screen.

2

Press the AIR button
to select “ON” or“OFF”.
The default setting is “OFF”.

3

OFF
CHANGELCD BACKGROUNDOFFNO
LCD BACKGROUND

Press the MODE button.
“END” appears and the display returns to thescreen in Step 1.

6-2-9. Bluetooth settingThis sets whether to start Bluetooth communication. Enabling this setting allows communication with
devices such as smartphones and tablet PCs to which the dedicated application has been downloaded.

1

Press the MODE button on the measurement screen several times todisplay the BLUETOOTH screen.

2

Press the AIR button to
select “ON” or “OFF”,
then press the MODE
button.

OFF
CHANG
BLUETOOTH

OFFNO
BLUETOOTH

The default setting is “OFF”.
“END” appears and the display returns to the screen in Step 1.

NOTE





The setting is retained even when the power is turned off.
This does not appear if “Display mode item display: ON/OFF” is disabled in user mode.
Bluetooth function is option for ATEX/IECEx specification.
Download “RK Link” app on Google Play (Android) or the App Store (iOS), and follow the simple
directions.
 Bluetooth function turns off in 5 minutes of inactivity after turning ON. This setting can be changed
with the data logger management program (sold separately).

51 /121

6 Setting Procedure

6-2. Display mode settings

6-2-10. Buzzer volume adjustment
This adjusts the alarm buzzer volume.

1

Press the MODE button on the measurement screen several times todisplay the BUZZER VOLUME screen.

2

Press the AIR button to
select “HIGH” or “LOW”,
then press the MODE
button.

HIGH
CHANGEBUZZER VOLUMEHIGHNOBUZZER VOLUME

The default setting is “HIGH”.

LOW
BUZZER VOLUME“END” appears and the display returns to the screen
in Step 1.

NOTE

 The setting is retained even when the power is turned off.
 This does not appear if “Display mode item display: ON/OFF” is disabled in user mode.

6-2-11. Display language setting<Procedure for ATEX/IECEx specification>
This appears if a language other than English has been set. The function restores the display language to
English.

1

Press the MODE button on the measurement screen several times todisplay the LANGUAGE CHANGE screen.

2

Press the AIR button.
The language change
confirmation screen isdisplayed.
The default setting is“ENGLISH”.

3

Press the MODE button.
The display switches toJapanese and returns to themeasurement screen.
Pressing the AIR button returns
the display to the screen in Step
1 with the display language set
to English.

52 /121

6 Setting Procedure

6-2. Display mode settings

NOTE

 The setting is retained even when the power is turned off.
 Once the original display language has been restored, the display language cannot be changed to alanguage other than the original language in display mode. For information on changing the display
language, see “6-4-17. Language setting” in “User mode settings” on page 78.

53 /121

6 Setting Procedure

6-3. User mode

6-3. User mode
User mode lets you set the date and time, alarm setpoints, and other settings.

6-3-1. Displaying user mode
1

With the power turned off, press the
AIR button and POWER button at thesame time.

2

Release the buttons when the buzzer
blips.
The power turns on, and the user mode menu
appears.

3

BUMP TESTGAS CALBUMP SETTING
USER MODE

Use the AIR button to select an item
to be set, then using the MODE button,
go to the setting screen.

4

Once settings are complete, press the
AIR button on the user mode menu
several times to select “STARTMEASURE”, then press the MODE
button.
The product operates in the same way as when the
power has just been turned on and proceeds to themeasurement screen.

NOTE The display returns to the user mode menu after each setting. To return to the menu while making
the settings, hold down the AIR button and MODE button at the same time.
 A password input screen is displayed if the password setting is enabled in user mode. For
information on how to change the default password, see “6-4-18. User password setting”.

54 /121

6 Setting Procedure

6-3. User mode

6-3-2. User mode settings
Screen display (setting item)

LCD display

Reference
page
P. 94

BUMP TESTGAS CAL (Calibration)
CAL SETTING (Calibration expiration date setting)* Displayed on ATEX/IECEx specification only

BUMP TESTGAS CALBUMP SETTING
USER MODE

P. 86
P. 56
P. 56

BUMP SETTINGMAN DOWN

MAN DOWN
ALARM SETTINGLUNCH BREAK
USER MODE

ALARM SETTINGLUNCH BREAK
CONFIRMATIONCONFIRMATIONAUTO BACKLIGHTBACKLIGHT TIME
USER MODE

AUTO BACKLIGHTBACKLIGHT TIME

P. 66
P. 68
P. 71
P. 71
P. 74
P. 74
P. 75

KEY TONED MODE SETTINGSIR UNIT SELECT (Unit switching for CO2 sensor)* Displayed only on models that detect CO2.
May not be displayed if the CO2 sensor is not connected
correctly.

KEY TONED MODE SETTING
IR UNIT SELECTUSER MODE

DATE

P. 76

P. 76

CO2AIR SETTING (CO2 sensor air calibration:
ON/OFF)* Displayed only on models that detect CO2.
May not be displayed if the CO2 sensor is not connected
correctly.

P. 75

CO2AIR SETTINGDATEDATE FORMAT
USER MODE

P. 77
P. 77

DATE FORMATLANGUAGELANGUAGE
USER PASSWORD
ROM/SUM
USER MODE

USER PASSWORD
ROM/SUM

P. 78
P. 79
P. 80
P. 80

RADIO STANDARD* Not displayed on certain models

ROM/SUM
RADIO STANDARD
START MEASURE
USER MODE

START MEASURE

55 /121

6 Setting Procedure

6-4. User mode settings

6-4. User mode settings
User mode allows settings to be changed to increase usability.

6-4-1. Bump test
The product includes a function for performing a bump test (function check).
Here, you can select "Perform Bump Test (BUMP TEST)" and "Switch to measurement start screen frombump test (BUMP TEST)".
After the bump test is successful, the screen will automatically move to the measurement start screen.
*If multiple clinder settings are selected, the measurement start screen will not move automatically after the
success of bump test.
For information on the bump test procedure, see “7-3. Bump test” on page 94.

6-4-2. Calibration
The product’s GAS CAL mode allows automatic calibration using preset gas concentrations in addition to
air calibration.
Span adjustment requires dedicated tools and a calibration gas. Contact Riken Keiki.
After successful gas calibration, the screen will automatically move to the measurement start screen.
*If multibple cylinder settings are selected, the measurement start screen will not move automatically after
the success of bump test. .
For information on the calibration procedure, see “7-2. Calibration” on page 83.

NOTE Once setting is complete, press the AIR button to select “ESCAPE”, then press the MODE button.
The display returns to the user mode menu.

6-4-3. Calibration expiration date settingThis section describes “Calibration expiration date: ON/OFF”, “Calibration expiration date interval”,“Operation after calibration date expired”, and “Calibration gas setting”.
* Displayed on ATEX/IECEx specification only

NOTE

 Once setting is complete, press the AIR button to select “ESCAPE”, then press the MODE button.
The display returns to the user mode menu.

<Calibration expiration date setting menu>
1

Press the AIR button on the user modemenu to select “CAL SETTING”, thenpress the MODE button.
The calibration expiration date setting menu screen
is displayed.

56 /121

6 Setting Procedure2

6-4. User mode settings

Press the AIR button to select therequired setting, then press the MODE
button.

Setting item

LCD display

Reference page
<Calibration expiration date: ON/OFF>
P. 57

CAL REMINDERCAL INTERVAL<Calibration expiration date interval>
P. 58<Operation after calibration dateexpired> P. 58

CAL EXPIRED<Calibration expiration date check gas
selection> P. 59

CAL CHECK GASESCAPE<Calibration expiration date: ON/OFF>This lets you enable and disable the calibration expiration date.

1

Press the AIR button to select “CALREMINDER”, then press the MODE
button.

2

Press the AIR button to select ON or
OFF for the calibration expiration datesetting, then press the MODE button.
Pressing the AIR button toggles between ON and
OFF for the calibration expiration date setting. The
default setting for ATEX/IECEx specification is “ON”.

3

Press the MODE button.
“END” appears and the display returns to thecalibration expiration date setting menu.

57 /121

6 Setting Procedure

6-4. User mode settings<Calibration expiration date interval>
This lets you select the number of days until the calibration expires.

1

Press the AIR button to select “CALINTERVAL”, then press the MODE
button.

2

Press the AIR button to select the
number of days for calibration
expiration, then press the MODE
button.
Pressing the AIR button lets you select thecalibration expiration date interval between 1 and
1,000 days. The default setting is “365 DAYS”.

3

Press the MODE button.
“END” appears and the display returns to thecalibration expiration date setting menu.

<Operation after calibration date expired>This lets you specify the operation after the calibration date has expired.

1

Press the AIR button to select “CALEXPIRED”, then press the MODE
button.

2

Press the AIR button to select theoperation after the calibration date has
expired.
・ CONFIRM TO USER:
Action depends on the operation.
Press the AIR button to proceed
to measurement mode. Press the
MODE button to proceed to Autocalibration cylinder setting.
・ CANT USE: Measurement mode is not available.
Press the MODE button or after 6
seconds without any operation toproceed to Auto calibration cylinder
setting.
・ NO EFFECT: Action depends on the operation.
After the indication that calibration
has expired, press the MODE button
to proced to Auto calibration cylinder
setting. After 6 seconds without any
operation, proceed to measurementmode automatically.
The default setting is “CONFIRM TO USER”.

3

Press the MODE button.
“END” appears and the display returns to thecalibration expiration date setting menu.
58 /121

6 Setting Procedure

6-4. User mode settings<Calibration expiration date check gas selection>
Allows you to select the gas for which the calibration expiration date is to be checked.

1

Press the AIR button to select “CALCHECK GAS”, then press the MODE
button.
The gas for calibration can be selected.

2

Press the AIR button to select the gas
for which the calibration expiration
date is to be checked.
Pressing the AIR button lets you select the gas typefor which the calibration expiration date is to bechecked.
・ALL GAS: All sensors
・4GAS: All sensors other than the fourth slot
The default setting is “ALL GAS”.

3

Press the MODE button.
“END” appears and the display returns to thecalibration expiration date setting menu.

59 /121

6 Setting Procedure

6-4. User mode settings

6-4-4. Bump test settingThis lets you set various conditions for bump testing.

<Bump test setting menu>
1

Press the AIR button on the user modemenu to select “BUMP SETTING”, thenpress the MODE button.
The bump test setting screen is displayed.

2

Press the AIR button to select therequired setting, then press the MODE
button.

Setting item

LCD display

GAS CALBUMP SETTINGMAN DOWN
USER MODE

BUMP PARAMETERBUMP REMINDERBUMP INTERVALBUMP SETTING

Reference page
<Bump time selection> P. 61<Bump tolerance selection> P. 61<Calibration time selection after bumptest> P. 62

BUMP PARAMETERBUMP REMINDERBUMP INTERVALBUMP PARAMETERBUMP REMINDERBUMP INTERVALBUMP SETTING<Calibration after bump test: ON/OFF>
P. 62<Calibration after bump test:
ON/OFF>P.62<Bump test expiration date interval
selection>P.63

BUMP EXPIRED<Operation selection after bump test
expiration> P. 64

BUMP CHECK GAS<Bump test gas selection> P. 65

ESCAPENOTE

 Once setting is complete, press the AIR button to select “ESCAPE”, then press the MODE button.
The display returns to the user mode menu.

60 /121

6 Setting Procedure

6-4. User mode settings<Bump time selection>
This sets the time for introducing the test gas.

1

Press the AIR button to select “BUMP
PARAMETER”, then press the MODE
button.
The bump test setting menu is displayed.

2

Press the AIR button to select “GASTIME”, then press the MODE button.
The bump time is displayed.

3

GAS TIMETOLERANCECAL TIME
BUMP SETTING

Press the AIR button to select the bumptime, then press the MODE button.
Pressing the AIR button lets you select the bump timefrom a choice of 30, 45, 60, and 90 seconds. The default
setting is “30 SEC”.

4

BUMP PARAMETERBUMP REMINDERBUMP INTERVALBUMP SETTING

30 SECGAS TIME

Press the MODE button.
“END” appears and the display returns to the bump test
setting menu.

<Bump tolerance selection>
This sets the threshold for checking the test gas.
Gases other than oxygen: Calibration concentration ±(calibration concentration × tolerance)
Oxygen: Calibration concentration ±(difference between calibration concentration and 20.9 % × tolerance)

1

Press the AIR button to select “BUMP SETTING”, then press the MODE
button.
The bump setting menu is displayed.

2

Press the AIR button to select “BUMP
PARAMETER”, then press the MODE
button.
The bump test setting menu is displayed.

3

Press the AIR button to select“TOLERANCE”, then press the MODE
button.
The bump tolerance is displayed.

4

GAS TIMETOLERANCECAL TIME
BUMP SETTING

Press the AIR button to select thebump tolerance, then press the MODE
button.
Pressing the AIR button lets you select the bumptolerance from a choice of 10, 20, 30, 40, and 50 %.
The default setting is “50 %”.

5

BUMP PARAMETERBUMP REMINDERBUMP INTERVALBUMP SETTING

Press the MODE button.
“END” appears and the display returns to the bump
test setting menu.
61 /12150
TOLERANCE

6 Setting Procedure

6-4. User mode settings<Calibration time selection after bump test>
This selects the time for calibration after a bump test has failed.

1

Press the AIR button to select “BUMP SETTING”, then press the MODE
button.
The bump setting menu is displayed.

2

Press the AIR button to select “BUMP
PARAMETER”, then press the MODE
button.
The bump test setting menu is displayed.

3

Press the AIR button to select “CALTIME”, then press the MODE button.
The time for calibration after a bump test has failed isdisplayed.

4

Press the AIR button to select thecalibration time after a bump test, thenpress the MODE button.
Pressing the AIR button lets you select thecalibration time after a bump test from a choice of 90
and 120 seconds. The default setting is “90 SEC”.

5

BUMP PARAMETERBUMP REMINDERBUMP INTERVALBUMP SETTINGTOLERANCECAL TIME
AUTO CALBUMP PARAMETER

90 SECCAL TIME

Press the MODE button.
“END” appears and the display returns to the bump
test setting menu.

<Calibration after bump test: ON/OFF>This enables/disables the function for automatic calibration if a bump test fails.

1

Press the AIR button to select “BUMP PARAMETER”, then press the
MODE button.
The bump setting menu is displayed.

2

Press the AIR button to select “BUMP
PARAMETER”, then press the MODE
button.
The bump test setting menu is displayed.

3

Press the AIR button to select “AUTO
CAL”, then press the MODE button.
The ON/OFF selection is displayed for calibration
after a bump test.

4

Press the AIR button to select ON or
OFF for calibration after a bump test,
then press the MODE button.
Pressing the AIR button lets you select ON or OFF
for calibration after a bump test. The default setting is
“ON”.

5

Press the MODE button.
“END” appears and the display returns to the bump
test setting menu.
62 /121

BUMP PARAMETERBUMP REMINDERBUMP INTERVALBUMP SETTINGCAL TIME
AUTO CALESCAPEBUMP PATAMETERON
AUTO CAL

6 Setting Procedure

6-4. User mode settings<Bump test expiration date display: ON/OFF>This selects the notification for bump test expiration.

1

Press the AIR button to select “BUMP SETTING”, then press the MODE
button.
The bump setting menu is displayed.

2

Press the AIR button to select “BUMPREMINDER”, then press the MODE
button.
The ON/OFF selection is displayed for bump test
expiration date display.

3

Press the AIR button to select ON or
OFF for the bump test expiration datedisplay.
Pressing the AIR button lets you select ON or OFF
for the bump test expiration date display. The default
setting is “OFF”.

4

BUMP PARAMETERBUMP REMINDERBUMP INTERVALBUMP SETTINGON
BUMP REMINDER

Press the MODE button.
“END” appears and the display returns to the bump
test setting menu.

<Bump test expiration date interval selection>
This sets the interval until the bump test expiration date notification is given after a bump test.

1

Press the AIR button to select “BUMP SETTING”, then press the MODE
button.
The bump setting menu is displayed.

2

Press the AIR button to select “BUMPINTERVAL”, then press the MODE
button.
You can select the number of days until the bump
test expiration date.

3

Press the AIR button to select ON or
OFF for the bump test expiration dateinterval.
Pressing the AIR button lets you select the bump test
expiration date interval from 0 to 365 days. The
default setting is “30 DAY”.

4

BUMP PARAMETERBUMP REMINDERBUMP EXPIREDBUMP SETTINGDAYSBUMP INTERVAL

Press the MODE button.
“END” appears and the display returns to the bump
test setting menu.

NOTE If the setting exceeds 30 days, the SDM-3R may diagnose an abnormal value when connected to
the SDM-3R docking station. In such a case, please set this setting to 30 days or less.

63 /121

6 Setting Procedure

6-4. User mode settings<Operation selection after bump test expiration>
This selects the operation after the bump test expiration date display.

1

Press the AIR button to select “BUMP SETTING”, then press the MODE
button.
The bump setting menu is displayed.

2

Press the AIR button to select “BUMP
EXPIRED”, then press the MODE button.
You can select the operation after bump test
expiration.

3

Press the AIR button to select theoperation after bump test expiration.
Pressing the AIR button displays the following
operations after bump test expiration:
・ CONFIRM TO USER:
Action depends on the operation.
Press the AIR button to proceed tomeasurement mode. Press the MODE
button to proceed to Bump test cylinder
setting.
・ CANT USE: Measurement mode is not available.
Press the MODE button or after 6
seconds without any operation toproceed to Bump test cylinder setting.
・ NO EFFECT: Action depends on the operation.
After the indication that calibration
has expired, press the MODE button
to proced to Bump test cylinder setting.
After 6 seconds without any operation,
proceed to measurement mode
automatically.
The default setting is “CONFIRM TO USER”.

4

BUMP INTERVALBUMP EXPIREDBUMP CHECK GASBUMP SETTING

Press the MODE button.
“END” appears and the display returns to the bump
test setting menu.

64 /121

CONFIRM TO USE
BUMP EXPIRED

6 Setting Procedure

6-4. User mode settings<Bump test gas selection>
Allows you to select the gas for which bump test expiration date is to be checked.

1

Press the AIR button to select “BUMP SETTING”, then press the MODE
button.
The bump setting menu is displayed.

2

Press the AIR button to select “BUMPCHECK GAS”, then press the MODE
button.
Allows you to select the gas for which bump test
expiration date is to be checked.

3

Press the AIR button to select thebump test gas.
Pressing the AIR button lets you select the gas forwhich bump test expiration date is to be checked.
・ ALL GAS: All sensors
・ 4GAS: All sensors other than the fourth slot
The default setting is “ALL GAS”.

4

BUMP EXPIREDBUMP CHECK GASESCAPEBUMP SETTING

Press the MODE button.
“END” appears and the display returns to the bump
test setting menu.

65 /121

ALL GAS
BUMP CHECK GAS

6 Setting Procedure

6-4. User mode settings

6-4-5. Man down alarm settingThis section describes “Man down alarm: ON/OFF”, “Panic alarm: ON/OFF”, and “Man down alarm time
setting”.

NOTE Once setting is complete, press the AIR button to select “ESCAPE”, then press the MODE button.
The display returns to the user mode menu.

<Man down alarm setting menu>
1

Press the AIR button on the user modemenu to select “MAN DOWN”, thenpress the MODE button.
The man down alarm menu screen is displayed.

2

Press the AIR button to select therequired setting, then press the MODE
button.

Setting item
MAN DOWNPANICMAN DOWN TIMEESCAPELCD display

MAN DOWNPANICMAN DOWN TIMEMAN DOWN MENUBUMP SETTINGMAN DOWN
ALARM SETTING
USER MODEMAN DOWNPANICMAN DOWN TIMEMAN DOWN MENU

Reference page
<Man down alarm: ON/OFF> P. 66<Panic alarm: ON/OFF> P. 67<Man down alarm time setting> P. 67<Man down alarm: ON/OFF>This lets you enable and disable the man down alarm.

1

Press the AIR button to select “MANDOWN”, then press the MODE button.

2

Press the AIR button to select ON or
OFF for the man down alarm, thenpress the MODE button.
Pressing the AIR button lets you select ON or OFF
for the man down alarm. The default setting is “OFF”.
“END” appears and the display returns to the man
down alarm menu.

66 /121

MAN DOWNPANICMAN DOWN TIMEMAN DOWN MENUON
MAN DOWN

6 Setting Procedure

6-4. User mode settings<Panic alarm: ON/OFF>This lets you enable and disable the panic alarm.

1

Press the AIR button to select“PANIC”, then press the MODE button.

2

MAN DOWNPANICMAN DOWN TIMEMAN DOWN MENU

Press the AIR button to select ON or
OFF for the panic alarm, then press the
MODE button.
Pressing the AIR button lets you select ON or OFF
for the panic alarm. The default setting is “OFF”.

ON
PANIC

“END” appears and the display returns to the man
down alarm menu.

<Man down alarm time setting>This lets you set the time before a man down alarm is triggered.

NOTE Set each alarm time within the following range:
10 seconds ≤ prealarm 1 ≤ prealarm 2 ≤ main alarm ≤ 240 seconds

1

Press the AIR button to select “MANDOWN TIME”, then press the MODE
button.

2

Press the AIR button to select the time
for man down prealarm 1, then press
the MODE button.
Pressing the AIR button lets you select the time forprealarm 1 in the range of 10 to prealarm 2 setting
time. The default setting is “60 SEC”.

3

Press the AIR button to select the time
for man down prealarm 2, then press
the MODE button.
Pressing the AIR button lets you select the time forprealarm 2 in the range of prealarm 1 setting time tomain alarm setting time. The default setting is “75
SEC”.

4

Press the AIR button to select the time
for man down main alarm, then press
the MODE button.
Pressing the AIR button lets you select the time formain alarm in the range of prealarm 2 setting time to
240 seconds. The default setting is “90 SEC”.
“END” appears and the display returns to the man
down alarm menu.
67 /121PANIC
MAN DOWN TIMEESCAPEMAN DOWN MENUSECWARNING 1 TIMESECWARNING 2 TIME

SEC
ALARM TIME

6 Setting Procedure

6-4. User mode settings

6-4-6. Alarm setpoint settingThis section describes the settings for the first to third alarm setpoints, STEL alarm setpoint, and TWA
alarm setpoint and how to restore the default settings.

<Alarm setpoint setting>
Alarm setpoints can be set in one-digit units.
Detection target gas
Combustible gas (HC/CH4)
Carbon monoxide (CO)Hydrogen sulfide (H2S）
Sulfur dioxide (SO2)
Nitrogen dioxide (NO2)
Hydrogen cyanide (HCN)
Phosphine (PH3)Ammonia (NH3)
Carbon dioxide (CO2)[vol%]Carbon dioxide (CO2)[ppm]Detection target gas
Oxygen (O2)

1 digit
1 %LEL1 ppm
0.1 ppm
0.05 ppm
0.05 ppm
0.1 ppm
0.01 ppm
0.5 ppm
0.01 vol%20 ppm
1 digit
0.1 vol%Lower limit
1 %LEL(Recommended range 10%LEL or more)
12 ppm(Recommended range 25ppm or more)
0.5 ppm(Recommended range 1.0ppm or more)
0.25 ppm(Recommended range 1.00ppm or more)
0.50 ppm
0.9 ppm
0.05 ppm
8.0 ppm
0.20 vol%1,000 ppm
First/second alarm
Lower limit
Upper limit
0.0 %
20.0 %

Upper limit
60 %LEL
2,000 ppm
200.0 ppm
100.00 ppm
20.00 ppm
30.0 ppm
20.00 ppm
400.0 ppm
8.00 vol%10,000 ppm

Third alarm
Lower limit
Upper limit
21.8 %
40.0 %NOTE

 Set the alarm setpoints as follows:First alarm ≤ second alarm ≤ third alarm (first alarm ≥ second alarm for oxygen) Use alarm settings within the range commensurate with the performance of the equipment. Setting
alarm setpoints below the recommended range may cause false alarms.

1

Press the AIR button on the user modemenu to select “ALARM SETTING”,
then press the MODE button.
The combustible sensor selection screen isdisplayed.

2

Press the AIR button to select the gas
type, then press the MODE button.
Pressing the AIR button alternately displays thedetection target gas and the alarm setpoint reset
screen (page 69).
Pressing the MODE button displays the first alarm
setpoint (WARNING) setting screen.

3

Press the AIR button to select anumerical value for the first alarm
setpoint, then press the MODE button.
The second alarm setpoint (ALARM) setting screen
is displayed.

68 /121

MAN DOWN
ALARM SETTINGLUNCH BREAK
USER MODE

6 Setting Procedure

46-4. User mode settings

Press the AIR button to select thesecond alarm setpoint numericalvalue, then press the MODE button.
The third alarm setpoint (ALARM H) setting screen isdisplayed.

5

Press the AIR button to select thethird alarm setpoint numerical value,then press the MODE button.
For toxic gases, the STEL and TWA setting screensare displayed after the above steps. Set these in thesame way.
“END” appears and the alarm setpoint reset screen
appears.

NOTE

 For information on how to reset settings, see “<Resetting alarm setpoints>” on page 69. The alarm
setpoint reset screen may not appear if the product is not set correctly. If this occurs, contact Riken
Keiki.
 For more information on alarm setpoints, see “4 Alarm Activation” on page 20.
4<Resetting alarm setpoints>
This restores alarm setpoints to their default settings.

1

Press the AIR button on the user
mode menu to select “ALARM
SETTING”, then press the MODE
button.

MAN DOWN
ALARM SETTINGLUNCH BREAK
USER MODE

The combustible sensor selection screen isdisplayed.

2

Press the AIR button several
times.
The alarm setpoint reset screen is displayed.

3

Press the MODE
button.
The alarm setpoint reset
setting screen is displayed.
To cancel resetting, press
the AIR button.

4

RESET ALARM-P ?

RESET ALARM-P ?

YESRESET ALARM-PNO
RESET ALARM-P

Press the MODE
button.

ARE YOU SURE ?
NORESET ALARM-P

The alarm setpoint reset
confirmation screen isdisplayed.

69 /121

6 Setting Procedure

56-4. User mode settings

Press the MODE
button.

ARE YOU SURE ?

“END” appears and thedisplay returns to the user
mode menu.

YES
RESET ALARM-P

70 /121

6 Setting Procedure

6-4. User mode settings

6-4-7. Lunch break: ON/OFF
This lets you enable and disable the lunch break function. The lunch break function retains the TWA andPEAK values from the last time the power was turned off and loads them to continue measurement thenext time the power is turned on.

1

Press the AIR button on the user modemenu to select “LUNCH BREAK”, thenpress the MODE button.
The lunch break setting screen is displayed.

2

Press the AIR button to select ON or
OFF for the lunch break function.
Pressing the AIR button lets you select ON or OFF
for the lunch break function. The default setting is“OFF”.

3

ALARM SETTINGLUNCH BREAK
CONFIRMATIONUSER MODEOFF
LUNCH BREAK

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

NOTE

 When the lunch break setting is enabled, a confirmation screen is displayed asking the user whether
to retain the TWA and PEAK values from the last time the power was turned off and continue
measurement or to reset the values when the power is turned on.

6-4-8. Confirmation beep settingThis function provides an audible indication of whether the product is operating normally.
The buzzer sounds at preset intervals while measurement is underway. The following functions can also be
operated with "BUMP / CAL", "ALM ALRT" and "B / C / ALM”.
1. BUMP/CAL・Starts operation when calibration deadline setting is ON and or calibration is expired, or bump deadline
setting is ON and bump is expired.
・Once the operation is starts, it does not stop until all loaded gases are calibrated or bumped.
(Except H2 cancellation)・Every interval setting time The LED lights up for about one second.
2. ALM ALRT・Starts operation when a gas alarm is issued. (Including minus sensor failure)・Once the operation is starts, it does not stop until all loaded gases are calibrated or bumped.
(Except H2 cancellation)・Every interval setting time The LED lights up for about one second.
3. B/C/ALM
・Starts operation when calibration deadline setting is ON and or calibration is expired, or bump deadline
setting is ON and bump is expired.
・Once the operation is starts, it does not stop until all loaded gases are calibrated or bumped.
(Except H2 cancellation)・Every interval setting time The LED lights up for about one second.

71 /121

6 Setting Procedure

6-4. User mode settings<Confirmation beep setting menu>
1

Press the AIR button on the user modemenu to select “CONFIRMATION”, thenpress the MODE button.
The confirmation beep menu screen is displayed.

2

Press the AIR button to select therequired setting, then press the MODE
button.

Setting item
BEEP SELECTBEEP INTERVALESCAPELCD display

BEEP SELECTBEEP INTERVALESCAPECONFIRMATIONLUNCH BREAK
CONFIRMATIONAUTO BACKLIGHT
USER MODE
BEEP SELECTBEEP INTERVALESCAPECONFIRMATION
Reference page
<Beep operation setting> P. 72<Beep interval setting> P. 72

NOTE

 Once setting is complete, press the AIR button to select “ESCAPE”, then press the MODE button.
The display returns to the user mode menu.

<Beep operation setting>This lets you set the confirmation beep operation.

1

Press the AIR button to select “BEEPSELECT”, then press the MODE button.
The beep operation selection screen is displayed.
However, if you change the setting, the operations of"BUMP / CAL", "ALARM ALERT" and "BUMP / CAL /ALARM" will stop.

2

Press the AIR button.
Pressing the AIR button displays the following
screens in sequence:・ “OFF”
・ “LED”
・ “BUZZER”
・ “LED+BUZZER”
・ “BUMP/CAL”
・ “ALARM ALERT”
・ “BUMP/CAL/ALARM”
The default setting is “OFF”.

3

BEEP SELECTBEEP INTERVALESCAPECONFIRMATION

Press the MODE button.
“END” appears and the display returns to theconfirmation beep setting menu.

<Beep interval setting>This lets you set the interval between confirmation beeps.

72 /121OFF
BEEP SELECT

6 Setting Procedure

1

6-4. User mode settings

Press the AIR button to select “BEEPINTERVAL”, then press the MODE
button.
The beep interval setting screen is displayed.

2

Press the AIR button.
Pressing the AIR button lets you select the beep
interval from a choice of 0.5 minutes and from 1 to 99
minutes. The default setting is “5 MIN”.

3

BEEP SELECTBEEP INTERVALESCAPECONFIRMATION

Press the MODE button.
“END” appears and the display returns to theconfirmation beep setting menu.

73 /121MIN
BEEP INTERVAL

6 Setting Procedure

6-4. User mode settings

6-4-9. Automatic backlight: ON/OFF
This enables and disables the function to automatically illuminate the backlight on the LCD display.
When enabled, the backlight will automatically go on in dark locations.

1

Press the AIR button on the user modemenu to select “AUTO BACKLIGHT”,
then press the MODE button.
The backlight setting screen is displayed.

2

Press the AIR button to select ON or
OFF for the backlight.
Pressing the AIR button lets you select ON or OFF
for the backlight. The default setting is “ON”.

3

CONFIRMATIONAUTO BACKLIGHTBACKLIGHT TIME
USER MODE

OFF
AUTO BACKLIGHT

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

6-4-10. Backlight lighting time settingThis lets you set the duration for which the LCD backlight remains lit.

1

Press the AIR button on the user modemenu to select “BACKLIGHT TIME”,
then press the MODE button.
The backlight lighting time setting screen isdisplayed.

2

Press the AIR button to select thebacklight lighting time.
Pressing the AIR button lets you select a backlight
lighting time of OFF or 1 to 255 seconds.
The default setting is “30 SEC”.

3

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

74 /121

AUTO BACKLIGHTBACKLIGHT TIMEKEY TONEUSER MODESEC
BACKLIGHT TIME

6 Setting Procedure

6-4. User mode settings

6-4-11. Key tone: ON/OFF
This enables and disables the key operation tone.

1

Press the AIR button on the user modemenu to select “KEY TONE”, thenpress the MODE button.
The key tone setting screen is displayed.

2

Press the AIR button to select ON or
OFF for the key tone.
Pressing the AIR button lets you select ON or OFF
for the key tone. The default setting is “ON”.

3

BACKLIGHT TIMEKEY TONED MODE SETTING
USER MODEON
KEY TONE

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

6-4-12. Display mode item display: ON/OFF
This lets you set whether the display mode items that can be set are displayed or hidden.
When set to OFF, the following items are not displayed in display mode:・ Combustible gas conversion setting
・ Long-life battery setting
・ LCD inversion setting
・ LCD background inversion
・ Bluetooth setting
・ Buzzer volume adjustment function
・ Display language change

1Press the AIR button on the user modemenu to select “D MODE SETTING”,
then press the MODE button.
The display mode item display setting screen isdisplayed.

2

Press the AIR button to select ON or
OFF for the display mode item display.
Pressing the AIR button lets you select ON or OFF
for the display mode item display.
The items listed above will not be displayed if this is
set to “OFF”.
The default setting is “ON”.

3

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

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KEY TONED MODE SETTINGDATEUSER MODEON
D MODE SETTING

6 Setting Procedure

6-4. User mode settings

6-4-13. CO2 sensor unit selection
This lets you select the units used with the CO2 sensor.
This setting is displayed only on models that detect CO2.

1

Press the AIR button on the user modemenu to select “IR UNIT SELECT”, thenpress the MODE button.
The CO2 sensor unit selection screen is displayed.

2

Press the AIR button to select the unit
for the CO2 sensor.
Pressing the AIR button displays the following
screens alternately:・ vol%・ ppm

3

D MODE SETTING
IR UNIT SELECT
CO2AIR SETTING
USER MODE

IR UNIT SELECT

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

6-4-14. CO2 sensor air calibration: ON/OFF
This sets whether or not the CO2 sensor is subject to air calibration. Setting to ON calibrates the CO2
sensor when air calibration is performed.
This is displayed only on models that detect CO2.

1

Press the AIR button on the user modemenu to select “CO2AIR SETTING”,
then press the MODE button.
The CO2 sensor air calibration setting screen isdisplayed.

2

Press the AIR button to select ON or
OFF for CO2 sensor air calibration.
Pressing the AIR button lets you select ON or OFF
for the CO2 sensor air calibration.
The default setting is “OFF”.

3

IR UNIT SELECT
CO2AIR SETTINGDATEUSER MODE

ON
CO2AIR SETTING

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

NOTE
This may not be displayed depending on the setting and connection status.
CO2 sensor connected normally: Displayed
CO2 sensor not connected normally or set to a sensor other than CO2 sensor: Not displayed

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6 Setting Procedure

6-4. User mode settings

6-4-15. Date and time settingThis sets the date and time for the internal clock.

1

Press the AIR button on the user modemenu to select “DATE”, then press the
MODE button.
The date and time setting screen is displayed.
The item currently blinking can be set.

2

Press the AIR button to select therequired setting item, then press the
MODE button.
Set the date and time in the sequence year -> month-> day -> hour -> minute.
・ YYYY (year)
・ MM (month)・ DD (day)・ 0:00 (time)

CO2AIR SETTINGDATEDATE FORMAT
USER MODEYYYY/MM/DD
DATE

Press the MODE button after setting the “minute”
item. “END” appears and the display returns to theuser mode menu.

6-4-16. Date format settingThis lets you select one of three different date formats.

1

Press the AIR button on the user modemenu to select “DATE FORMAT”, thenpress the MODE button.
The date format setting screen is displayed.

2

Press the AIR button to select thedesired format.
The following formats are available:
・ “YYYY/MM/DD” (year/month/day)・ “DD/MM/YYYY” (day/month/year)
・ “MM/DD/YYYY” (month/day/year)
The default setting is “ “MM/DD/YYYY” for
ATEX/IECEx specification.

3

DATE
DATE FORMATLANGUAGE
USER MODE

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

77 /121YYYY/MM/DD
DATE FORMAT

6 Setting Procedure

6-4. User mode settings

6-4-17. Language settingThis lets you select one of thirteen different languages for the LCD display.

1

Press the AIR button on the user modemenu to select “LANGUAGE”, thenpress the MODE button.
The language setting screen is displayed.

2

Press the AIR button to select thedesired language.
The following languages are available:
・ ENGLISH
・ JAPANESE・ ITALIAN
・ SPANISH
・ GERMAN・ FRENCH
・ PORTUGUESE・ RUSSIAN
・ VIETNAMESE・ POLISH
・ TURKISH
・ ROMANIAN・ CZECH
The default setting is “ENGLISH” for ATEX/IECEx
specification.

3

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

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DATE FORMATLANGUAGE
USER PASSWORD
USER MODE

6 Setting Procedure

6-4. User mode settings

6-4-18. User password settingThis lets you set a password for accessing user mode. The password can be set as a four-digit number inthe range 0000 to 9999.

1

Press the AIR button on the user modemenu to select “USER PASSWORD”,
then press the MODE button.
The password can be enabled or disabled on theuser mode password setting screen.

2

LANGUAGE
USER PASSWORD
ROM/SUM
USER MODE

Press the AIR button to select “ON”,
then press the MODE button.
The password input screen is displayed.
The default setting is “0000”.
The password can be set as a four-digit number inthe range 0000 to 9999.

3

OFFUSER PASSWORD

Press the AIR button to select anumber from 0 to 9, then press the
MODE button.
The number is input as the first digit of the password
and the second digit blinks.

USER PASSWORD

Press the MODE button after entering the final digit.
“END” appears and the display returns to the user
mode menu.

<Accessing user mode when password-protected>
1With the power turned off, press the
AIR button and POWER button at thesame time.
Release the buttons when the buzzer blips.
The password input screen is displayed.

2Enter the preset password.
Press the AIR button to select the number for thecurrently selected digit, then press the MODE button
to confirm.

The user mode menu is displayed once thepassword has been correctly entered.
If the password entered is incorrect, an error isdisplayed. The display switches to “Screen transition
from powering on to displaying measurement screen”
in “5-3. Startup”.

79 /121PASSWORD

BUMP TESTGAS CALBUMP SETTING
USER MODE

6 Setting Procedure

6-4. User mode settings

6-4-19. ROM/SUM display
This displays the program number and SUM value of the product.
* This is not normally used by the user.

1

Press the AIR button on the user modemenu to select “ROM/SUM”, then press
the MODE button.
The ROM/SUM screen is displayed.

The following information is displayed alternately on
the ROM/SUM screen.
・ “ROM/SUM MAIN”
・ “ROM/SUM SENSOR”
・ “ROM/SUM IR SENS”* Only on models with CO2 sensor
・ “BLUETOOTH”

2

USER PASSWORD
ROM/SUM
RADIO STANDARD
USER MODE

ROM/SUM MAIN

Press the MODE button.
“END” appears and the display returns to the user
mode menu.

6-4-20. Bluetooth authentication display
This lets you check Bluetooth authentication.

1

Press the AIR button on the user modemenu to select “RADIO STANDARD”,
then press the MODE button.
Bluetooth authentication is displayed.

ROM/SUM
RADIO STANDARD
START MEASURE
USER MODE

The authentication code is displayed in thearea.

RADIO STANDARD
2Press the MODE button.
“END” appears and the display returns to the user
mode menu.

NOTE
This is not displayed on certain models.
Bluetooth equipped:
Displayed
Bluetooth not equipped: Not displayed

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7 Maintenance7-1. Maintenance intervals and maintenance items

7
7

Maintenance

The product is an important safety and disaster-prevention device.
Maintain the product at regular intervals to ensure performance and improve disaster-prevention andsafety reliability.

7-1. Maintenance intervals and maintenance items
The following items should be maintained regularly before using the product:・ Daily maintenance: Perform maintenance before commencing work.
・ Monthly maintenance: Perform maintenance by testing the alarms once a month.
・ Regular maintenance: Perform maintenance at least once a year (ideally, at least once every six
months).
Maintenance details

Daily
maintenance

Monthly
maintenanceRegularmaintenanceBattery level

Check to confirm that battery levels are adequate.







Concentration
display

Check to confirm that the concentration readout is
0 (or 20.9 % for oxygen meter) after drawing in
fresh air. If the readout is not 0, check to confirm
that that no interference gases are present, thenperform air calibration.







Main unit
operation

Check the LCD display to confirm that the readout
is not faulty.







FilterCheck to confirm that the filter is not dirty.







Alarm test

Test the alarm and check to confirm that the alarm
LED arrays, buzzer, and vibrator all operatecorrectly.

‒





‒

‒



‒

‒



Maintenance
item

Span
adjustment

Perform span adjustment using a calibration gas.

Gas alarm
check

Check the gas alarm with a calibration gas.

WARNING If an abnormality is discovered in the product, contact Riken Keiki immediately.

NOTE Span adjustment requires dedicated tools and preparation of a calibration gas. Always contact
Riken Keiki for span adjustment.
 The built-in sensors have finite service lives and must be replaced regularly.
 If the sensors cannot be calibrated using span adjustment, the readings are not restored after air
calibration, or the readings fluctuate, the sensors are at the end of their life. Contact Riken Keiki for
replacement.

81 /121

7 Maintenance7-1. Maintenance intervals and maintenance items

Maintenance service
Riken Keiki provides services related to regular maintenance including
span adjustment, as well as other adjustments and maintenance.
Preparing calibration gas requires the use of dedicated tools, such as gas cylinders of the specified
concentration and gas sampling bags.
Our certified service engineers have expert knowledge of the dedicated tools used for these services,along with expertise in products. Please take advantage of the Riken Keiki maintenance service tomaintain safe operation of the product.
The maintenance service covers the following main aspects. Please contact Riken Keiki for more
information.

<Main maintenance service details>
Battery level
check

Checking battery levels

Concentration
display check

Checks to confirm that the concentration readout is 0 (or 20.9 % for oxygen meter)using a zero gas.
Air calibration (zero adjustment) is performed if the reading is not zero.

Filter check

Checks the dust filter for contamination and clogging.
The filter is replaced if dirty or clogged.

Alarm test

Tests the alarm to check to confirm that the alarm LEDs, buzzer, and vibrator all
operate correctly.

Spanadjustment

Performs span adjustment using a calibration gas.

Gas alarm
check

Checks the gas alarm using a calibration gas.
 Checking alarms (confirming alarm activation when alarm setpoint isreached) Checking delay time (checking delay time until alarm activation)
 Checks the buzzer, LEDs, vibrator, and concentration display. (Checks
operation for each of the three-step alarms.)

Product
cleaning andrepair(visualinspection)

Checks the exterior of the product for dirt and damage; cleans and repairs any
prominent problem areas.
Parts are replaced if cracked or damaged.

Product
operation check

Operates the buttons to check function operations and parameters.

Consumablepart
replacement

Replaces degraded components such as sensors and filters.

82 /121

7 Maintenance7-2. Calibration

7-2. Calibration
The product can be calibrated using automatic calibration with preset gas concentrations in addition to air
calibration.
Span adjustment requires dedicated tools and a calibration gas. Contact Riken Keiki.

CAUTION Do not use lighter gas to check the sensitivity of the product. Constituents in the lighter gas may
degrade sensor performance.
 When equipped with a carbon dioxide (CO2) sensor, it may show a high indication immediately
after energization due to the characteristics of the sensor
You Warm it up for about 10 to 20 minutes and use it after instructions are stable.
 When an ammonia (NH3) sensor is installed, the indication may rise temporarily immediately after
the sensor is energized due to its characteristics. When replacing the battery before it runs out,
please wait at least 10 minutes before turning the power back on. Also. When the sensor is replaced,
the battery is replaced because it is dead, or the battery is removed and has not been used for along period of time, turn the power back on after 120 minutes or more.

7-2-1. Preparation for calibration
This section describes how to calibrate the product using calibration adapter (simple type).

<Required equipment/materials>






Calibration gas
Gas sampling bag
Calibration adapter (simple type) *ATEX/IECEx specification is shipped with this parts.
Pump<Recommended calibration gas concentrations>*
Detection target gas

Sensor model

Calibration gas

Calibration gas
concentration

Combustible gas (HC)NCR-6309

Isobutane (i-C4H10)

50 %LEL (0.7 vol%)Combustible gas (CH4)

NCR-6309

Methane (CH4)

50 %LEL (2.2 vol%)Hydrogen sulfide (H2S）

ESR-A1DP or
ESR-A13i

Hydrogen sulfide (H2S）

25.0 ppm

Oxygen (O2)ESR-X13P

Oxygen (O2)
N2 diluted

12.0 %

Carbon monoxide (CO)ESR-A1DP or
ESR-A1CP or
ESR-A13P

Carbon monoxide (CO)50 ppmCarbon monoxide (CO)ESR-A1CP

Hydrogen (H2)
air diluted

500 ppm

Sulfur dioxide (SO2)ESR-A13D

Sulfur dioxide (SO2)
N2 diluted

8.00 ppm

Nitrogen dioxide (NO2)ESR-A13D

Nitrogen dioxide (NO2)
air diluted

4.80 ppm

83 /121

7 Maintenance7-2. Calibration
Hydrogen cyanide(HCN)

8.0 ppm

Phosphine (PH3)(substitute gas)

0.5 ppm(PH3 concentration x
conversion factor = HCNconcentration)

Hydrogen cyanide (HCN)ESR-A13D

Phosphine (PH3)

ESR-A13D2

Phosphine (PH3)0.50 ppm

Ammonia (NH3)

ESR-B134

Ammonia (NH3)40.0 ppm

Carbon dioxide (CO2)

IRR-0409

Carbon dioxide (CO2)

2.5 vol%

Nitrogen99.999%Carbon dioxide (CO2)

IRR-0433

Carbon dioxide (CO2)5,000 ppm

Nitrogen99.999%* The same applies to bump test gas.



NOTE
Do not perform gas calibration and bump test using the conversion gas, even when using the combustible
gas conversion function. Gas calibration and bump tests should always be performed using the calibration
gases listed in the table above.

<Gas supply method>
Attach a calibration adapter (simple type) to the product, connect the gas sampling bag as shown in
the figure below to introduce gas at a flow rate of 250 mL/min, and wait 60 seconds (120 seconds forammonia (NH3) sensor) after the reading increases before calibrating.
Gassampling bag

GAS
OUT

GAS
IN

Pump

250mL/min

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7 Maintenance7-2. Calibration

WARNING
Calibration gas
The calibration gas is a hazardous gas (e.g., combustible gas, toxic gas, oxygen deficiency).
Handle the gas and related jigs and tools with due care.
Gas sampling bag
Use different gas sampling bags for each gas type and concentration to ensure accurate
calibration.
Calibration location
 Do not calibrate in a confined space.
 Do not calibrate in locations where gases such as silicone and spray can gases are used.
 Calibrate indoors at normal temperatures with no significant fluctuations (within ±5 °C).
Carbon monoxide sensor (ESR-A1CP) calibration
 The carbon monoxide sensor with hydrogen interference correction function (ESR-A1CP) must be
calibrated separately for carbon monoxide and hydrogen.
 The carbon monoxide and hydrogen used for calibration must each be a single gas. Calibration
can be performed using a gas mixture, but correct span adjustment will not be achieved, andconcentration readings will be inaccurate.
 If hydrogen sensitivity is not calibrated, carbon monoxide readings may be slightly higher or lower
than actual concentrations when measured in environments where hydrogen is also present.
Hydrogen cyanide sensor (ESR-A13D) calibration
 Use a calibration gas that contains hydrogen cyanide diluted with air or phosphine diluted withnitrogen or air as a standard gas. Calibration can be performed with gases containing othercomponents, but they cannot be calibrated to the correct sensitivity and will not give accurate
concentration readings.
 When performing calibration with substitute gas (PH3), remove the interference gas removal filter(CF-A13D-2). For details on how to remove the filter, see Section 7-5-2, "Filter replacement".
 When calibrating with substitute gas (PH3), calculate the value of thecalibration gas concentration by multiplying the PH3 concentration by
the conversion factor (PH3 concentration x conversion factor = HCNconcentration). The conversion factor is printed on the side of thesensor to the right of the sensor model. For removal of the sensor, refer
to Section 7-5-2, "Filter replacement".
Conversion Factor Print Image(Example: 14)

CAUTION When supplying gas, leave the GAS OUT side open and discharge the supplied gas to a safe
place, or connect the gas sampling bag to the GAS OUT side to recover the supplied gas.
 If it is used and stored for a long time in a dry environment, the hydrogen gas sensitivity calibration
may not be possible. If FAIL SENSOR is displayed at the time of hydrogen gas sensitivity
calibration, release the main body overnight or more in an environment with sufficient humidity.
Please install again and perform gas calibration again. However, if CO gas sensitivity calibration
can not be performed, please contact your dealer or our nearest sales office for sensor
replacement.

NOTE RP-3R (option) or SDM-3R (option) can also be used for calibration in addition to the methods
described above.
To use RP-3R (option), the pump mode should be set to Low mode.

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7 Maintenance7-2. Calibration

7-2-2. Calibration setting menu
This section describes “Air calibration”, “Auto calibration concentration setting”, “Auto calibration cylinder
setting”, “Auto calibration”, and “CO2 zero calibration”.

1

Press the AIR button on the user modemenu to select “GAS CAL”, then press
the MODE button.
The calibration menu screen is displayed.

2

Press the AIR button to select therequired setting, then press the MODE
button.

Setting item

AIR CALBUMP TESTGAS CALBUMP SETTING
USER MODE

AIR CAL
CO2 ZERO CAL
AUTO CALGAS CAL

LCD display

Reference page

AIR CAL
CO2 ZERO CAL
AUTO CALGAS CAL“7-2-3. Air calibration” P.87

CO2 ZERO CAL* Displayed only on models that
detect CO2.
May not be displayed if the CO2
sensor is not connected
correctly.

“7-2-4. CO2 zero calibration” P. 89“7-2-5. Auto calibration” P.90
“7-2-6. Switch from AUTO calibration
to measurement start screen” P.91
“7-2-7. Auto calibration cylinder
setting” P. 92“7-2-8. Auto calibration gas
concentration selection” P. 93

AUTO CALESCAPENOTE

 Once setting is complete, press the AIR button to select “ESCAPE”, then press the MODE button.
The display returns to the user mode menu.

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7 Maintenance7-2. Calibration

7-2-3. Air calibration
WARNING When air calibration is performed in the atmosphere, check the atmosphere for freshness before
starting. The presence of interference gases will make it impossible to perform zero adjustment
correctly and potentially result in hazardous conditions in the event of actual gas leaks.

CAUTION Always perform air calibration under conditions of pressure, temperature, and humidity similar to
those in the operating environment and in fresh air.
 Wait for the readout to stabilize before performing air calibration.
 By default, air calibration is not performed on the CO2 sensor. You can enable air calibration for
the CO2 sensor by setting the CO2 sensor air calibration setting to ON in user mode. For
information on how to change the setting, see “6-4-14. CO2 sensor air calibration: ON/OFF” onpege 76. Air calibration adjusts to 400 ppm. Confirm that the surrounding air is fresh. Note that the
product will not perform to standard product specifications if you perform air calibration with thissetting. If CO2 air calibration is performed successfully, the CO2 zero calibration value is deleted
and set to 400 ppm.
 If the temperature between the storage and use locations changes rapidly by 15°C or more,acclimate the sensor in the same environment as the use location for about 10 minutes (about 30
minutes for ammonia (NH3) sensors) with the power turned on, and perform air calibration in fresh
air before use.

NOTE If air calibration fails, “FAIL” appears next to the measurement for the faulty sensor together with“SENSOR”. Press the MODE button to reset the fault alarm (calibration failure). Air calibration will
not be performed for the faulty sensor and the concentration will be calculated using the value
before calibration.
 Air calibration can also be performed in measurement mode. (P. 33)
 When using the combustible gas conversion function with the long-life battery setting ON, in
principle, the indicated value may rise temporarily after power-on, and depending on the alarm
setting value, a gas alarm may be issued. Please wait about 5 minutes after power-on and perform
air calibration before use.
In particular, Toluene, Xylene, N-nonane, or Methyl isobutyl ketone tend to rise comparatively, so it
is recommended to use the product with the long-life battery setting OFF.

1

Press the AIR button to select “AIRCAL”, then press the MODE button.
The air calibration screen is displayed.

2

Hold down the AIR button.

87 /121

AIR CAL
CO2 ZERO CAL
AUTO CALGAS CAL

7 Maintenance7-2. Calibration

Air calibration is performed.
HOLD AIR KEY
AIR CAL

3

Release the button when “RELEASE” isdisplayed.

ADJUSTING ZERORELEASE“PASS” is displayed if air calibration was successful.

PASS
AIR CAL

The current concentration after air calibration
appears. The display returns to the calibration menu
screen.
“FAIL” is displayed if calibration was unsuccessful.
“END” appears and the display returns to thecalibration menu screen.

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7 Maintenance7-2. Calibration

7-2-4. CO2 zero calibration
WARNING Use high purity air or nitrogen for zero calibration of the carbon dioxide sensor.

1

Press the AIR button to select “CO2ZERO CAL”, then press the MODE
button.
The CO2 zero calibration screen is displayed.

2

CO2 ZERO CAL
AUTO CALESCAPEGAS CAL

After introducing high purity air or
nitrogen push the MODE button after
60 seconds.
CO2 ZERO CAL

CO2 zero calibration is performed.

ADJUSTING
CO2 ZERO CAL“PASS” is displayed if CO2 zero calibration was
successful.

PASS
CO2 ZERO CAL

The current concentration after CO2 zero calibration
appears. The display returns to the calibration menu
screen.
“FAIL” is displayed if calibration was unsuccessful.
“END” appears and the display returns to thecalibration menu screen.

NOTE

CO2 ZERO CAL

 If air calibration of the CO2 sensor is enabled in user mode, the CO2 zero calibration value is deleted
and set to 400 ppm when air calibration is successful.
 If CO2 air calibration is performed successfully, the 400 ppm calibration value is deleted and set to
0 ppm.

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7 Maintenance7-2. Calibration

7-2-5. Auto calibration
This calibrates for each gas at the specified concentration.

WARNING When calibrating the hydrogen cyanide sensor (ESR-A13D) with substitute gas (phosphine), remove
the interference gas removal filter (CF-A13D-2) and perform calibration. For details on how to
replace the filter, refer to Section 7-5-2, "Filter replacement".

1

Press the AIR button to select “AUTO
CAL”, then press the MODE button.

2

CO2 ZERO CAL
AUTO CALESCAPEGAS CAL

Select the cylinder for calibration, thenpress the MODE button.
For information on cylinder settings, see “7-2-7. Autocalibration cylinder setting” on page 92.

3

Introduce the calibration gas, wait 60 seconds,
and then press the MODE button.

Auto calibration is performed.

ADJUSTING
AUTO CAL“PASS” is displayed if air calibration was successful.
“FAIL” is displayed if calibration was unsuccessful.

PASS
AUTO CAL

The concentration after auto calibration is displayed.

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7 Maintenance7-2. Calibration

DISP MAX SPAN

Moves to the measurement start screen.

WARNING For models with a combustible gas sensor installed, the screen shown
READ GAS
on the right may be displayed after auto calibration. When the screen
LIST IN
shown on the right is displayed, the alarm is automatically cleared by
MANUALpressing the MODE button or after 5 seconds.
 The screen shown on the right is displayed when the combustible gas sensor is poisoned bysilicone compounds, halides, or other substances. When the screen shown on the right isdisplayed, the combustible gas conversion function can be used only for the gas types marked with
"" in the "Conversion when conversion is restricted" column in the "Conversion gas list" section of"6-2-2. Combustible gas conversion setting.” If you wish to continue to use the combustible gas
conversion function for gas types marked with "×", please contact Riken Keiki.

NOTE If a CO2 sensor is installed, always perform CO2 zero calibration before auto calibration.
Air calibration → CO2 zero calibration → auto calibration
 For gases other than CO2, air calibration must always be performed before auto calibration.

7-2-6. Switch from AUTO calibration to measurement start
screenIn this section, it explains about switchment from AUTO calibration to measurement start screen.

1

Press the AIR button and select “AUTOCAL” and press the MODE button.
AUTO calibration screen is displayed.

2

Press the AIR button and select “STARTMEASURE”.

3

Press the MODE button.

CO2 ZERO CAL
AUTO CALESCAPEGAS CAL

START MEASURE
The LCD lights up completely and will move to themeasurement start screen.

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7 Maintenance7-2. Calibration

7-2-7. Auto calibration cylinder settingThis section describes how to set gas groups (cylinders) for calibration. Five gas cylinders can be set as A
to E.

1

Press the AIR button to select “AUTO
CAL”, then press the MODE button.
The auto calibration screen is displayed.

2

CO2 ZERO CAL
AUTO CALESCAPEGAS CAL

Press the AIR button.
Pressing the AIR button displays the gas type andconcentration for cylinders A to E in sequence.

3

Select “CYL SETTING”, then press the
MODE button.
CYL SETTING

4

Press the AIR button.
Pressing the AIR button displays the detection target
gas in sequence.
Pressing the AIR button once more displays“ESCAPE” and returns the display to the screen in
Step 1.

5

Press the MODE button on the sensor
selection screen for changing cylinder
settings.
The cylinder setting change screen is displayed.

6

Press the AIR button to select acylinder from A to E, then press the
MODE button.
“END” appears and the display returns to thecalibration menu screen.

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7 Maintenance7-2. Calibration

7-2-8. Auto calibration gas concentration selection
This section describes how to select the auto calibration gas concentration for the sensors installed.
Calibration gas concentration can be set in one-digit units within the setting range.
<Calibration gas concentration setting range>
Detection target
Sensor model
Calibration gas
gas

1 digit

Lower limit

Upper limit

Combustible gas(HC)

NCR-6309

Isobutane (iC4H10)

1 %LEL

1 %LEL

75 %LEL

Combustible gas(CH4)

NCR-6309

Methane (CH4)

1 %LEL

1 %LEL

75 %LEL

Hydrogen sulfide(H2S）

ESR-A1DP or
ESR-A13i

Hydrogen sulfide(H2S）

0.1 ppm

0.5 ppm

200.0 ppm

Oxygen (O2)ESR-X13P

Oxygen (O2)0.1 vol%

0.0 vol%

18.0 vol%Carbon monoxide(CO)

ESR-A1DP or
ESR-A1CP* or
ESR-A13P

Carbon monoxide
(CO)

1 ppm

12 ppm

2,000 ppm

Carbon monoxide(CO)

ESR-A1CP*

Hydrogen (H2)**

1 ppm

25 ppm

2,000 ppm

Sulfur dioxide(SO2)

ESR-A13D

Sulfur dioxide(SO2)0.05 ppm

0.25 ppm

100.00 ppm

Nitrogen dioxide(NO2)

ESR-A13D

Nitrogen dioxide(NO2)0.05 ppm

0.50 ppm

20.00 ppm

Hydrogen cyanide(HCN)***ESR-A13D

Hydrogencyanide (HCN)

0.1 ppm

0.9 ppm

30.0 ppm

Phosphine (PH3)

ESR-A13D2

Phosphine (PH3)0.01 ppm

0.05 ppm

20.00 ppm

Ammonia (NH3)

ESR-B134

Ammonia (NH3)0.5 ppm

8.0 ppm

400.0 ppm

Carbon dioxide(CO2)

IRR-0409

Carbon dioxide(CO2)0.01 vol%0.20 vol%4.00 vol%Carbon dioxide(CO2)

IRR-0433

Carbon dioxide(CO2)

20 ppm

1,000 ppm

10,000 ppm* CO(-H2) calibration should be performed using single gas and not as a mixture of CO and H2.
** Hydrogen must be calibrated in the range 10 °C to 30 °C.
*** When calibrating the hydrogen cyanide sensor with PH3 (substitute gas), refer to "7-2-1. Preparation
for calibration" for calibration gas concentration values. The sensor must be calibrated in the range of
10°C to 30°C

1

Press the AIR button to select “AUTO
CAL”, then press the MODE button.
The auto calibration screen is displayed.

2

Press the AIR button.
Pressing the AIR button displays the concentrations forcylinders A to E in sequence.

93 /121

CO2 ZERO CAL
AUTO CALESCAPEGAS CAL

7 Maintenance3

7-3. Bump test

Select “SETTING CAL-P”, then press the
MODE button.
SETTING CAL-P

4

Press the AIR button to select thecalibration gas type.
Pressing the AIR button displays the detection target
gas in sequence.
Pressing the AIR button once more displays “ESCAPE”
and returns the display to the screen in Step 1.

5

Press the MODE button on the sensor
selection screen for changing calibration
gas concentrations.
The calibration concentration change screen isdisplayed.

6

Press the AIR button to select thecalibration concentration, then press the
MODE button.
“END” appears and the display returns to the calibration
menu screen.

7-3. Bump test
The product includes a function for performing a bump test (function check).

7-3-1. Perform bump test (BUMP TEST)
A bump test can be performed for gas types selected from cylinders A to E. Prepare a bump test gas in
the same way as for the calibration gas (P. 83).

WARNING When performing a bump test of the hydrogen cyanide sensor (ESR-A13D) with an substitute gas(phosphine), remove the interference gas removal filter (CF-A13D-2) and perform calibration. See
Section 7-5-2 "Filter Replacement" for filter replacement. For information on the concentration of thebump test gas, refer to "7-2-1 Preparation for calibration".

1

Press the AIR button on the user
mode menu to select “BUMP TEST”,
then press the MODE button.
The bump test screen is displayed.

2

Press the AIR button to select thecylinder for the bump test.

Cylinders A to E are displayed in sequence.
Pressing the AIR button once more displays“ESCAPE” and returns the display to the screen in
Step 1.
94 /121

BUMP TESTGAS CALBUMP SETTING
USER MODE

7 Maintenance3

7-3-1. Perform bump test (BUMP TEST)

Press the MODE button on the screen
displaying the cylinder.
Introduce the gas for the bump test.
The bump test is performed.

If calibration is specified to be performed after abump test fails,
calibration will be automatically performed if thebump test fails.

After the bump test and calibration are completed,the bump test results (left), calibration results (right)
are displayed together with the readings at thebump test and after calibration.

“P”: Passed, “F”: Failed

3(Only those calibrated are displayed.)

Press the MODE button.
“END” appears and the display returns to themeasurement start screen.

CAUTION For models with a combustible gas sensor installed, the screen shown on
READ GAS
the right may be displayed if calibration is performed after a bump test
LIST IN
failure. When the screen shown on the right is displayed, the alarm is
MANUAL
automatically cleared by pressing the MODE button or after 5 seconds.
 The screen shown on the right is displayed when the combustible gas sensor is poisoned bysilicone compounds, halides, or other substances. When the screen shown on the right isdisplayed, the combustible gas conversion function can be used only for the gas types marked with
"" in the "Conversion when conversion is restricted" column in the "Conversion gas list" section of"6-2-2. Combustible gas conversion setting.” If you wish to continue to use the combustible gas
conversion function for gas types marked with "×", please contact Riken Keiki.

95 /121

7 Maintenance

7-3-2. Switching from bump test (BUMP TEST) to measurement start screen

7-3-2. Switching from bump test (BUMP TEST) tomeasurement start screen
This section explains how to switch from bump test screen to measurement start screen.

1

Press

the

AIR

buttonandselect“BUMP”, then press the MODE button.
The bump test screen is displayed.

2

Press the AIR“START” button.

3

Press the MODE button.

buttonand

BUMP TESTGAS CALBUMP SETTING
USER MODE

press

START MEASURE
The LCD lights up completely and will move to themeasurement start screen.

7-4. Cleaning instructions
Clean the product if it becomes excessively dirty. Be sure to turn off the power before cleaning, and wipe
clean using a rag or cloth soaked in water and firmly wrung out. Do not clean using water, organic
solvents or commercially available cleaners for cleaning, as these may cause the product to malfunction.

CAUTION When wiping the product clean, do not splash water on it or use organic solvents like alcohol andbenzine or commercially available cleaners. These may discolor or damage the surface of the
product, or cause the sensors to malfunction.

NOTE

 Water may remain in the buzzer sound opening or grooves after the product has got wet. Remove
any moisture as follows:① Wipe away moisture on the product thoroughly using a dry towel or cloth.
② Hold the product firmly and shake it about ten times with the buzzer sound opening facing
downward.
③ Wipe away moisture escaping from the inside thoroughly using a towel or cloth.
④ Place the product on a dry towel or cloth and allow it to stand at room temperature.

96 /121

7 Maintenance7-5. Parts replacement

7-5. Parts replacement
7-5-1. Periodic replacement parts
The consumable parts of the product are listed below. Consumable parts should be replaced using therecommended replacement intervals as a guide.

<Recommended replacement parts list>
Name

Recommended
check interval

Recommended
replacement
interval

Quantity(itemsper unit)

Combustible gas sensor(NCR-6309)

6 months

3 years

1*

O2 sensor (ESR-X13P)

6 months

3 years1*

CO/H2S sensor(ESR-A1DP)

6 months

3 years

1*

CO sensor (ESR-A13P)

6 months

3 years

1*

CO sensor (ESR-A1CP)

6 months

3 years

1*

H2S sensor (ESR-A13i)

6 months

3 years

1*

SO2 sensor (ESR-A13D)

6 months

3 years

1*

NO2 sensor (ESR-A13D)

6 months

3 years

1*

HCN sensor (ESR-A13D)

6 months

3 years

1*

PH3 sensor (ESR-A13D2)

6 months

3 years

1*

NH3 sensor (ESR-B134)

6 months

1 year1*

CO2 sensor (IRR-0409)

6 months

5 years

1*

CO2 sensor (IRR-0433)

6 months

5 years1*

Before and afteruse

6 months or whencontaminated1

Interference gas removal
filter3 months

6 months

1

Interference gas removal
filter3 months

6 months

1

Interference gas removal
filter3 months

6 months

1

Interference gas removal
filter3 months

6 months

1

Interference gas removal
filter3 months

6 months

1

Interference gas removal
filter3 months

6 months

1

Interference gas removal
filter3 months

6 months

1

Dust filter

97 /121

Remarks

Part No.: 4777 9344 90
10-sheet set
For combustible gas sensor(NCR-6309)
Part No.: 4777 9315 90
5-sheet set
For CO/H2S sensor(ESR-A1DP)
Part No.: 4777 9314 10
5-sheet set
For CO sensor(ESR-A1CP, ESR-A13P)
Part No.: 4777 9316 60
5-sheet set
For H2S and PH3 sensor(ESR-A13i, ESR-A13D2)
Part No.: 4777 9317 30
5-sheet set
For NO2 sensor (ESR-A13D)
Part No.: 4777 9318 10
5-sheet unit
For SO2 (ESR-A13D)
Part No.: 4777 9569 10
5-sheet unit
For HCN sensor (ESRA13D)
Part No.: 4777 9372 10
5-sheet unit

7 MaintenanceInterference gas removal
filter

7-5. Parts replacement

3 months

6 months

1

Rubber seals-

3 to 6 years

1 set

BUL-3R-

Approx. 500
charging/discharging
cycles1

For NH3 sensor(ESR-B134)
Part No.: 4777 9417 70
5-sheet unit*
When using rechargeable
battery unit (BUL-3R)
Part No.: 4777 16**A functional check by a qualified service engineer is required after replacement. To ensure safety and thestable operation of the product, request checking by a qualified service engineer. Contact Riken Keiki torequest checking.

NOTE The above replacement intervals are guidelines only. Replacement intervals may vary depending on
actual operating conditions. These intervals do not constitute warranty periods. Replacement
intervals may vary depending on the results of regular maintenance.

98 /121

7 Maintenance7-5. Parts replacement

7-5-2. Filter replacement
The dust filter and interference gas removal filters are consumables. Check the extent of contamination
and replace them regularly.

<Dust filter replacement procedure>
1

Loosen the two screws on theunderside of the main unit andrelease the two tabs.

ScrewsSensor cap

Dust filter2

Detach the sensor cap and replace thedust filter with a new one.

3

Reattach the sensor cap and press it
until the two tabs click into place.

4

Tighten the screws to secure the filter
cap.

Tabs

The screws should be tightened with a torque of 15
to 16 N∙cm.

WARNING Install the dust filter correctly. Product performance cannot be guaranteed if it is misaligned.
 Replace the filter every six months. Replace the filter whenever it becomes contaminated even if it
is less than six months.
 When replacing the dust filter or sensor filters, follow the procedure described in “Filter
replacement”, tighten the screws securely, and make sure that the two tabs on the sensor cap aresecurely engaged. If the screws are loose or the tabs of the sensor cap are not securely engaged,
foreign matter may get inside the product. Foreign matter may also get in if even minute particles
are caught between the contact surfaces.
 Do not damage the rubber seal.
 To maintain performance, we recommend replacing all of the rubber seals every three to six years,
regardless of condition.
 Be sure to use only dust filters and interference gas removal filters specifically intended for use
with the product. Use of non-approved parts may adversely affect gas detection performance andallow water to get inside the product.

99 /121

7 Maintenance7-5. Parts replacement<Interference gas removal filter replacement>1

2

Loosen the two screws
on the underside of themain unit and release thetwo tabs.
Remove the sensor cap,
dust filter and individual
sensor filters insequence, and replace
the individual sensor
filters.

3

Reseat the dust filter in
its original position.

4

Reattach the sensor cap
and press it until the twotabs click into place.

5

ネジScrewsSensor cap

Dust filter
Tabs

Interference gas
removal filter

Sensor coverSensorTighten the screws tosecure the filter cap.

The screws should be tightenedwith a torque of 15 to 16 N∙cm.

WARNING Install the individual interference gas removal filters correctly. If they are misaligned, gas may leak,preventing correct detection.
 Install the dust filter correctly. Product performance cannot be guaranteed if it is misaligned.
 Replace the filter every six months. Replace the filter whenever it becomes contaminated even if it
is less than six months.
 When replacing the dust filter or individual interference gas removal filters, follow the proceduredescribed in “Filter replacement”, tighten the screws securely, and make sure that the two tabs on
the sensor cap are securely engaged. If the screws are loose or the tabs of the sensor cap are notsecurely engaged, foreign matter may get inside the product. Foreign matter may also get in ifeven minute particles are caught between the contact surfaces.
 Do not damage the rubber seal.
 To maintain performance, we recommend replacing all of the rubber seals every three to six years,
regardless of condition.
 Be sure to use only dust filters and interference gas removal filters specifically intended for use
with the product. Use of non-approved parts may adversely affect gas detection performance andallow water to get inside the product.
 Use only the dedicated interference gas removal filter for each sensor. Otherwise gas may not be
detected correctly.

100 /121

8 Storage and Disposal

8-1. Procedures for storage or when not in use for extended periods

88Storage and Disposal

8-1. Procedures for storage or when not in use forextended periods
The product must be stored in the following environment:
・ In a dark location at normal temperature and humidity away from direct sunlight・ In a location free of gases, solvents, and vapors
Store the product in its shipping carton if this has been retained.
If the shipping carton is not available, store away from dust and dirt.

CAUTION The product must always be stored with the lithium ion battery unit attached. The productconstantly draws power for the sensors and clock even when the power is turned off. The sensors
may be damaged or the clock may become offset if there is no power supply.
 When an ammonia (NH3) sensor is installed, the indication may rise temporarily immediately after
the sensor is energized due to its characteristics. When replacing the battery before it runs out,
please wait at least 10 minutes before turning the power back on. Also. When the sensor is replaced,
the battery is replaced because it is dead, or the battery is removed and has not been used for along period of time, turn the power back on after 120 minutes or more.

NOTE If the product is not used for extended periods (three months or more), it should be stored with thelithium ion battery fully charged. Charge the battery every six months until it is fully charged.
 If the lithium ion battery is stored on its own, we recommend storing after it is discharged until thebattery level icon shows one bar.
 The date and time setting may be reset if the product is stored for extended periods with the battery
level icon showing one bar.

101 /121

8 Storage and Disposal

8-2. Procedures for use after storage

8-2. Procedures for use after storage
Perform calibration if the product is used again after a period in storage.

CAUTION
 Contact Riken Keiki to request readjustment and calibration.
 If there is a temperature difference of 15 °C or more between the storage and usage locations, turnon the power and allow the product to stand for about 10 minutes in a similar environment to theusage location to acclimatize before performing air calibration in fresh air.

8-3. Product disposal
Dispose of the product as industrial waste (incombustible) in accordance with local regulations.

WARNING Never attempt to disassemble electrochemical type sensors, as they contain electrolyte.
Electrolyte may cause inflammation if it comes into contact with the skin and may cause blindness
if it comes into contact with the eyes. Electrolyte may discolor or decompose clothing if it comes
into contact with clothing.
If contact occurs, rinse the area immediately with plenty of water.
 Dispose of dry batteries in accordance with procedure specified by the local authority.
 If the temperature between the storage and use locations changes rapidly by 15°C or more,acclimate the sensor in the same environment as the use location for about 10 minutes (about 30
minutes for ammonia (NH3) sensors) with the power turned on, and perform air calibration in fresh
air before use.

<Disposal in EU member states>
When disposing of the product in an EU member state, separate the batteries as specified.
The battery removed from the lithium ion battery unit (BUL-3R) must be handled in accordance with wastesorting and collection or recycling systems stipulated by the regulations of EU member states.

NOTE
Crossed-out recycle dustbin mark
 This pictogram is affixed to products which contain batteries that fall under
EU Battery Directive 2006/66/EC. Such batteries need to be disposed of as
specified by the latest directive. This pictogram indicates that the batteries
need to be separated from ordinary waste and disposed of appropriately.

102 /121

9 Troubleshooting

9-1. Product abnormalities

99TroubleshootingThis troubleshooting chapter does not cover the causes of all possible product malfunctions. It provides
brief explanations to assist in determining the causes of common problems.
If you encounter symptoms not addressed here or if problems persist even after taking corrective action,
contact Riken Keiki.

9-1. Product abnormalities
Symptoms<Screen display>

Cause

ActionThe POWER button waspressed for too short or too
long a time.

Charge the battery in a safe place at ambient
temperatures between 0 °C and +40 °C.Or
replace it with a new battery.
To turn on the power, hold down the POWER
button until the buzzer blips, and then release thebutton.

Abnormal operation

Disturbances due to sudden
static electricity noise, etc.

Turn off the power once, and then turn it back onagain.

Low battery voltage
alarm indication<FAIL BATTERY>

Battery levels are low.

Turn off the power, and charge the battery in asafe place at ambient temperatures between 0 °C
and +40 °C.

The power turns off
immediately when it
is turned on.
<TURN OFF>

Battery levels are low.

Turn off the power, and charge the battery in asafe place at ambient temperatures between 0 °C
and +40 °C.

The product is notsurrounded by fresh air.

Provide fresh air.

The sensor sensitivity has
degraded.

Contact Riken Keiki to request sensor
replacement.

The bump test gas
concentration setting differsfrom the concentration of thebump test gas supplied.

Check to confirm that the bump test gas
concentration setting matches the concentrationof the bump test gas supplied.

The sensor sensitivity has
degraded.

Contact Riken Keiki to request sensor
replacement.

The battery is depleted.
The power cannot
be turned on.

Air calibration is notpossible.
<FAIL SENSOR>

Bump testing is notpossible.

103 /121

9 Troubleshooting

Span adjustment is
not possible.
<FAIL SENSOR>

Symptoms<Screen display>

9-1. Product abnormalities
The calibration gas
concentration setting differsfrom the concentration of thecalibration gas supplied.

Check to confirm that the calibration gas
concentration setting matches the concentrationof the gas supplied.

Indication value decrease
due to a dry environment.
(only for ESR-A1CP H2)

Allow the unit to stand overnight or more in anenvironment with sufficient humidity and thenperform gas calibration again.

The sensor sensitivity has
degraded.

Contact Riken Keiki to request sensor
replacement.

Cause

ActionA sensorabnormality is
indicated inmeasurement
mode.
<FAIL SENSOR>

The sensor sensitivity has
degraded.

System abnormality<FAIL SYSTEM>

A circuit abnormality
occurred in the main unit.

Error No. 000

Internal ROM abnormality

Error No. 010

Internal RAM abnormality

Error No. 021

Internal FRAM abnormality

Error No. 031

FLASH abnormality

Error No. 080

Acceleration sensor
abnormality

Error No. 081

PCB abnormality

Error No. 082

Temperature sensor
abnormality

Error No. 083

Bluetooth fault

Clock abnormality<FAIL CLOCK>
Cannot access usermode.
The charge LED
flashes alternately
green and orange.

Contact Riken Keiki to request sensor
replacement.
(If “FAIL” appears in place of a measured value
when the power is turned on, press the MODE
button to reset the alarm. The gas sensors otherthan the faulty sensor can still be used.)Contact Riken Keiki for repair.

Internal clock abnormality

Set the date and time. (P. 77)
If this symptom occurs frequently, the internal
clock may be faulty and must be replaced.
Contact Riken Keiki.

Forgot user mode password.

Contact Riken Keiki.

The temperature is outside
the allowable charging
temperature range.

Charge at ambient temperatures between 0 °C
and +40 °C.

104 /121

9 Troubleshooting

9-2. Reading abnormalities

9-2. Reading abnormalities
Symptoms<Screen display>

Cause

ActionSensor drift

The reading rises(or drops) andremains
unchanged.

Perform air calibration.

Presence of interference
gases

Slow leakage

Environmental fluctuations

A gas alarm istriggered eventhough there is no
problem in themeasuring
environment.

Presence of interference
gases

Effects of noise

It is difficult to completely eliminate the effects ofinterference gases. Contact Riken Keiki for
information on countermeasures, such as
interference gas removal filters.
There may be a very small leakage (slowleakage) of the detection target gas. Leaving thisunresolved may lead to dangerous situations.
Take the same action as for gas alarms.
Perform air calibration.
It is difficult to completely eliminate the effects ofinterference gases. Contact Riken Keiki for
information on countermeasures, such as
interference gas removal filters.
Turn off the power once, and then turn it back onagain (restart). If similar symptoms recur
frequently, take appropriate measures to address
the noise source.

Dust filter clogging

Replace the dust filter.

The sensor sensitivity has
degraded.

Contact Riken Keiki to request sensor
replacement.

Slow response

105 /121

10 Product Specifications

10-1. Specifications list

1010

Product Specifications

10-1. Specifications list
<Common specifications>Concentration
display
Detection method
Displays
Display languages
Buzzer volume
Gas alarm
indication
Gas alarm patternFault alarm/self
diagnosis
Fault alarmindication
Fault alarm pattern
Panic alarmindication
Panic alarm pattern
Man down alarmindication
Man down alarm
pattern
Transmission
specifications
Power source
Continuous
operating time
Operating pressure
range
Construction
Explosion-proof
construction:
Explosion-proof
class

LCD digital (full dot)
Diffusion type
Clock, battery level, operation status
Japanese/English/French/Spanish/Portuguese/German/Italian/Russian/Vietnamese/Polish/Turkish/Romanian/Czech
Approx. 95 dB (mean value at 30 cm)
Gas alarm: Lamp flashing, continuous modulating buzzer sounding, gasconcentration display blinking, vibration
Self-latching
System abnormality, sensor abnormality, battery voltage drop, calibration failure
Lamp flashing, intermittent buzzer sounding, detail display
Self-latching
Prealarm: Lamp flashing, intermittent buzzer sounding (prealarm)
Main alarm: Lamp flashing, continuous modulating buzzer sounding
Self-latching
Prealarm: Lamp flashing, intermittent buzzer sounding (prealarm)
Main alarm: Lamp flashing, continuous modulating buzzer sounding
Self-latching
IrDA (for data logger), BLE
Dedicated lithium ion battery unit (BUL-3R)
BUL-3R: Approx. 25 hours (with long-life battery off, no CO2 sensor, 25 °C,
no alarm, no lighting)Approx. 16 hours (with long-life battery off, with CO2 sensor, 25 °C,
no alarm, no lighting)
80 kPa to 120 kPa (80 kPa to 110 kPa for explosion-proof range)
Dust-proof, splash-proof construction equivalent to IP68, drop resistant to 7 m
ATEX/IECEx specification:
Intrinsically safe explosion-proof construction and flame-proof enclosures
ATEX
ll 1 G Ex da ia llC T4 Ga / l M1 Ex da ia l Ma ( With combustible gas sensor)
ll 1 G Ex ia llC T4 Ga / l M1 Ex ia l Ma ( No combustible gas sensor)
IECEx
Ex da ia llC T4 Ga / Ex da ia l Ma ( With combustible gas sensor)
Ex ia llC T4 Ga / Ex ia l Ma ( No combustible gas sensor)
106 /121

10 Product Specifications

10-1. Specifications list

External
dimensions

With BUL-3R: Approx. 73 mm (W) × 65 mm (H) × 26 mm (D) (excluding
projections)

WeightWith BUL-3R: Approx. 120 g

107 /121

10 Product Specifications

10-1. Specifications list

<Individual sensor specifications>
Item

Detection
target gas

Combustible gas
Methan (CH4)＊

Isobutane (i-C4H10)*

NCR-6309
0 %LEL to 100 %LEL (1.3 vol%)0 %LEL to 100 %LEL (4.4 vol%)1 %LEL
1st alarm: 10 %LEL
Alarm setpoints
2nd alarm: 25 %LEL
(ATEX/IECEx
3rd alarm: 50 %LEL
specification)
OVER alarm: 100 %LEL
New ceramic type
Detection principle
Temporary use environment:-40 °C to +60 °C (no sudden changes)
Operating temperatureContinuous use environment: -20 °C to +50 °C (no sudden changes)
range
Temporary use environment:
0 %RH to 95 %RH (no condensation)
Operating humidity
Continuous use environment: 10 %RH to 90 %RH (no condensation)
range* The factory default setting is either CH4 or HC (specified in the order).
Sensor model
Detection range
1 digit

Item

Detection
target gas

Sensor model
Measurement range(ATEX/IECEx
specification)
Service range(ATEX/IECEx
specification)
1 digit
Alarm setpoints(ATEX/IECEx
specification)
Detection principle
Operating temperature
range
Operating humidity
range

Carbon monoxide(CO)Oxygen (O2)ESR-X13P

Hydrogen sulfide(H2S）

ESR-A1DP

0 to 25.0 %0 to 500 ppm

0 to 100.0 ppm

25.1 to 40.0 %501 to 2,000 ppm

100.1 to 200.0 ppm

0.1 %

1 ppm
0.1 ppm
1st alarm: 25 ppm
1st alarm: 5.0 ppm
L alarm: 19.5 %2nd alarm: 50 ppm
2nd alarm: 30.0 ppm
LL alarm: 18.0 %3rd alarm: 1,200 ppm
3rd alarm: 100.0 ppm
H alarm: 23.5 %TWA alarm: 25 ppm
TWA alarm: 1.0 ppm
OVER alarm: 40.0 %STEL alarm: 200 ppm
STEL alarm: 5.0 ppm
OVER alarm: 2,000 ppm OVER alarm: 200.0 ppm
Electrochemical typeTemporary use environment:-40 °C to +60 °C (no sudden changes)
Continuous use environment: -20 °C to +50 °C (no sudden changes)
Temporary use environment:
0 %RH to 95 %RH (no condensation)
Continuous use environment: 10 %RH to 90 %RH (no condensation)

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10 Product Specifications

Item

Detection
target gas

Sensor model
Measurement range(ATEX/IECEx
specification)
Service range(ATEX/IECEx
specification)
1 digit10-1. Specifications list

Oxygen (O2)

Carbon monoxide(CO)*Hydrogen sulfide(H2S）

ESR-A13P

ESR-A1CPESR-A13i

0 to 25.0 %0 to 500 ppm

0 to 100.0 ppm

25.1 to 40.0 %501 to 2,000 ppm

100.1 to 200.0 ppm

1 ppm
0.1 ppm
1st alarm: 25 ppm
1st alarm: 5.0 ppm
L alarm: 19.5 %2nd alarm: 50 ppm
2nd alarm: 30.0 ppm
Alarm setpoints
LL alarm: 18.0 %3rd alarm: 1,200 ppm
3rd alarm: 100.0 ppm(ATEX/IECEx
H alarm: 23.5 %TWA alarm: 25 ppm
TWA alarm: 1.0 ppm
specification)
OVER alarm: 40.0 %STEL alarm: 200 ppm
STEL alarm: 5.0 ppm
OVER alarm: 2,000 ppm OVER alarm: 200.0 ppm
Electrochemical type
Detection principle
Temporary use environment:-40 °C to +60 °C (no sudden changes)
Operating temperatureContinuous use environment: -20 °C to +50 °C (no sudden changes)
range
Temporary use environment:
0 %RH to 95 %RH (no condensation)
Operating humidity
Continuous use environment: 10 %RH to 90 %RH (no condensation)
range*The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce interference due tohydrogen. This function works for hydrogen concentrations up to 2,000 ppm. (However, if used in anenvironment exceeding 40°C for more than 15 minutes, it may be affected by hydrogen interference andmay indicate a higher carbon monoxide concentration than actual.)

Detection
target gas
Sensor model
Measurement range
Service range
1 digit
Item

Alarm setpoints

Detection principle
Operating temperature
range
Operating humidity
range

0.1 %

Carbon dioxide (CO2)
IRR-0409
IRR-0433
0 to 5.00 vol%0 to 10,000 ppm
5.01 to 10.00 vol%0.01 vol%20 ppm
1st alarm: 0.50 vol%1st alarm: 5,000 ppm
2nd alarm: 3.00 vol%2nd alarm: 5,000 ppm
3rd alarm: 3.00 vol%3rd alarm: 5,000 ppm
TWA alarm: 0.50 vol%
TWA alarm: 5,000 ppm
STEL alarm: 3.00 vol%OVER alarm: 10,000 ppm
OVER alarm: 10.00 vol%Non-dispersive infrared absorption method (NDIR)
Temporary use environment:-40 °C to +60 °C (no sudden changes)
Continuous use environment: -20 °C to +50 °C (no sudden changes)
Temporary use environment:
0 %RH to 95 %RH (no condensation)
Continuous use environment: 10 %RH to 90 %RH (no condensation)

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10 Product Specifications

Item

Detection
target gas

Sensor model
Measurement range
Service range
1 digit
Alarm setpoints(ATEX/IECEx
specification)
Detection principle
Operating temperature
range
Operating humidity
range

Item

Detection
target gas

10-1. Specifications list

Sulfur dioxide (SO2)

Nitrogen dioxide (NO2)ESR-A13D
ESR-A13D
0 to 20.00 ppm
0 to 20.00 ppm
20.05 to 100.00 ppm
0.05 ppm
0.05 ppm
1st alarm: 2.00 ppm
1st alarm: 2.00 ppm
2nd alarm: 5.00 ppm
2nd alarm: 4.00 ppm
3rd alarm: 100.00 ppm
3rd alarm: 20.00 ppm
TWA alarm: 2.00 ppm
TWA alarm: 0.50 ppm
STEL alarm: 5.00 ppm
STEL alarm: 1.00 ppm
OVER alarm: 100.00 ppm
OVER alarm: 20.00 ppm
Electrochemical typeTemporary use environment:-40 °C to +60 °C (no sudden changes)
Continuous use environment: -20 °C to +50 °C (no sudden changes)
Temporary use environment:
0 %RH to 95 %RH (no condensation)
Continuous use environment: 10 %RH to 90 %RH (no condensation)

Hydrogen cyanide (HCN)

Phosphine (PH3)

ESR-A13D
ESR-A13D20
to 20.00 ppm
0 to 30.0 ppm*
0.01
ppm
0.1 ppm
1st alarm: 10.0 ppm
1st alarm: 0.30 ppm
2nd alarm: 20.0 ppm
2nd alarm: 0.60 ppm
Alarm setpoints
3rd alarm: 30.0 ppm
3rd alarm: 1.00 ppm(ATEX/IECEx
TWA alarm: 0.9 ppm
TWA alarm: 0.30 ppm
specification)
STEL alarm: 4.5 ppm
STEL alarm: 1.00 ppm
OVER alarm: 30.0 ppm
OVER alarm: 20.00 ppm
Electrochemical type
Detection principle
Temporary use environment:
Temporary use environment:-20 °C to +60 °C-40 °C to +60 °C(no sudden changes)(no sudden changes)
Operating temperatureContinuous use nvironment:
Continuous use nvironment:
range-20 °C to +50 °C-20 °C to +50 °C(no sudden changes)(no sudden changes)
Temporary use environment:
0 %RH to 95 %RH (no condensation)
Operating humidity
Continuous use environment: 10 %RH to 90 %RH (no condensation)
range* The HCN sensor displays 0.0 to 0.2 ppm as 0.0 ppm.
Sensor model
Measurement range
Service range
1 digit110 /121

10 Product Specifications

Item

Detection
target gas

Sensor model
Display range
Detection range
Resolution
Alarm setpoints(ATEX/IECEx
specification)
Detection principle
Operating temperature
range

Operating humidity
range

10-1. Specifications list

Ammonia (NH3)
ESR-B134
0 to 400.0 ppm
0 to 300.0 ppm
0.5 ppm
1st alarm: 25.0 ppm
2nd alarm: 35.0 ppm
3rd alarm: 35.0 ppm
TWA alarm: 25.0 ppm
STEL alarm: 35.0 ppm
OVER alarm: 400.0 ppm
Electrochemical typeTemporary use environment:-30 °C to +50 °C(no sudden changes)
Continuous use nvironment:-20 °C to +50 °C(no sudden changes)
Temporary use environment:
0 %RH to 95 %RH (nocondensation)
Continuous use environment:
10 %RH to 90 %RH (nocondensation)

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10 Product Specifications

10-2. Accessory list

10-2. Accessory list
Standard accessories (ATEX/IECEx specification)
Part nameHand strap
Rubber protection cover
Ultra-slim alligator clip (with attachment screw)
AC adapter (In case of BUL-3R)
EU-PLUG (In case of BUL-3R)
Calibration adapter (simple type)Part number
0888 0605 90
4777 4175 00
4777 9203 102594 0898 30
2594 0933 60
4777 9370 70<Optional items (sold separately)>
Part nameBelt clip (with attachment screw)
Ultra-slim alligator clip (with attachment screw)
Belt assembly (with attachment fixture and screw)
Filter unit set (for ESR-A1DP) 5-sheet set
Filter unit set (for NCR-6309) 5-sheet set
Filter unit set (for ESR-A1CP, ESR-A13P) 5-sheet set
Filter unit set (for ESR-A13i, ESR-A13D2) 5-sheet set
Filter unit set (for ESR-A13D, NO2 sensor) 5-sheet set
Filter unit set (for ESR-A13D, SO2 sensor) 5-sheet set
Filter unit set (for ESR-B134) 5-sheet set
Dust filter 10-sheet set
Protective film 5-sheet set
Leather caseHeat-resistant case (not explosion-proof)
Manual suction kit (with sampling rod)
Manual suction kit (with 8m float-type tube)
Manual suction kit(with weighted 30 m tube)
BUL-3R + accessories
BUL-3R + accessories
AC adapter
AU plug
EU plug
UK plugCalibration adapter (simple type)
Calibration adapter
Charging cradle (BC-3R)
Charging cradle wall-mounting fixture
5-unit charging cable w/o AC adapter (cable length: 22.5cm)
5-unit charging cable w/o AC adapter (cable length: 60cm)
5-unit charging cable w/o AC adapter (cable length: 120cm)
Data logger management program (SW-GX-3R(EX))

Part No.
4777 9202 40
4777 9203 104777 9293 30
4777 9314 104777 9315 904777 9316 60
4777 9317 304777 9318 104777 9569 104777 9417 704777 9344 90
4777 9296 50
4777 4258 70
4777 4260 80
4777 9297 204777 9299 70
4777 9300 30
4777 9277 40
4777 9281 00
2594 0898 30
2594 0932 90
2594 0933 60
2594 0934 30
4777 9370 704777 9312 70
BC-3R 00
4777 4337 50
4777 9329 704777 9319 80
4777 9333 20
9811 0870 60

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11 Appendix

Data logger function

11
11

Appendix

Data logger function
The product is equipped with a data logger function that records measurement results and events such as
gas alarms, fault alarms, and calibration.

NOTE

 The data logger management program (sold separetely) is required to check data recorded using
the data logger function. Contact Riken Keiki for more information.

The data logger provides the following five functions:(1) Interval trend

Records the changes in measured concentration from when the power is turned on until it is turned off.
For combustible gases, carbon monoxide, and hydrogen sulfide, the average value, peak value, and peakvalue detection time are recorded; for oxygen, the average value, minimum value, minimum value
detection time, peak value, and peak value detection time are recorded.
Records data for the 3,600 most recent items.
If the number of items exceeds 3,600, the oldest data will be overwritten by the latest data.
If overwriting is disabled, recording stops when 3,600 is exceeded.
If 3,600 items are recorded for a single measurement, the oldest data will not be overwritten, andrecording will stop even if overwriting is enabled.
* However, if the maximum recording time is exceeded, the oldest data will be deleted even before
reaching 3,600.
The maximum recording times corresponding to different intervals are as follows:
10 seconds 20 seconds 30 seconds
1 minute
3 minutes
Interval

5 minutes

Maximum
10 hours
20 hours
30 hours
60 hours 180 hours 300 hours
recording time
* The standard interval is 5 minutes.
The interval can be set using the Data Logger Management Program (sold separately).

10 minutes
600 hours(2) Alarm trend

When an alarm is triggered, this function records the changes in measured concentration for 30 minutes
before and after the alarm occurred (one hour in total).
Alarm trend records peak values (minimum values for oxygen) over 5-second periods at 5-second
intervals.
Records data for the eight most recent items.
If the number of items exceeds eight, the oldest data will be overwritten by the latest data.

(3) Alarm event

Records alarm occurrences as events.
This function records the time the alarm was triggered, the measurement target gas, and the type of alarm
event.
Records the 100 most recent events.
If the number of events exceeds 100, the oldest data will be overwritten by the latest data.

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11 Appendix

Data logger function(4) Trouble event
Records fault alarm occurrences as events.
This function records the time when the fault alarm was triggered, the measurement target gas, device
information, and the type of trouble event.
Records the 100 most recent events.
If the number of events exceeds 100, the oldest data will be overwritten by the latest data.

(5) Calibration history
Records data when calibration is performed.
This function records calibration time, concentration values before and after calibration, and calibration
errors.
Records data for the 100 most recent calibrations.
If the number of calibrations exceeds 100, the oldest data will be overwritten by the latest data.

NOTE Communication mode starts automatically if the infrared communication port of the product ispositioned where IrDA communication is available while the date and time or battery level/gas alarm
pattern are displayed after the power is turned on. You can also enter communication mode bypressing the AIR and POWER buttons at the same time with the infrared communication port of the
product positioned where IrDA communication is available.
 A fault alarm will be triggered if no communication connection can be confirmed for a preset
duration in communication mode. If this occurs, either repeat the communication connection or turnoff the power for the product.

114 /121

11 Appendix

100 %LEL = ppm conversion list

100 %LEL = ppm conversion list
The following table shows the standard conversion for 100 %LEL and ppm.
Standard

IEC(Default setting)ISO

MethaneCH450,000 ppm

44,000 ppm

44,000 ppm

Isobutane

i-C4H1018,000 ppm

13,000 ppm

15,000 ppm

HydrogenH2

40,000 ppm

40,000 ppm

40,000 ppm

Methanol

CH3OH

55,000 ppm

60,000 ppm

60,000 ppm

Acetylene

C2H2

15,000 ppm

23,000 ppm

23,000 ppm

Ethylene

C2H4

27,000 ppm

23,000 ppm

24,000 ppm

EthaneC2H630,000 ppm

24,000 ppm

24,000 ppm

Ethanol

C2H5OH

33,000 ppm

31,000 ppm

31,000 ppm

Propylene

C3H6

20,000 ppm

20,000 ppm

18,000 ppm

Acetone

C3H6O

21,500 ppm

25,000 ppm

25,000 ppm

PropaneC3H8

20,000 ppm

17,000 ppm

17,000 ppm

Butadiene

C4H6

11,000 ppm

14,000 ppm

14,000 ppm

Cyclopentane

C5H10

14,000 ppm

14,000 ppm

14,000 ppm

Benzene

C6H6

12,000 ppm

12,000 ppm

12,000 ppm

N-hexanen-C6H14

12,000 ppm

10,000 ppm

10,000 ppm

Toluene

C7H8

12,000 ppm

10,000 ppm

10,000 ppm

N-heptane

n-C7H16

11,000 ppm

8,500 ppm

8,000 ppm

XyleneC8H1010,000 ppm

10,000 ppm

10,000 ppm

N-nonane

n-C9H20

7,000 ppm

7,000 ppm

7,000 ppm

Ethyl acetate

EtAc

21,000 ppm

20,000 ppm

20,000 ppm

Isopropyl alcohol

IPA

20,000 ppm

20,000 ppm

20,000 ppm

Methyl ethyl ketone

MEK

18,000 ppm

15,000 ppm

15,000 ppm

Methyl methacrylate

MMA

17,000 ppm

17,000 ppm

17,000 ppm

Dimethyl ether

DME

30,000 ppm

27,000 ppm

27,000 ppm

Methyl isobutyl
ketone

MIBK

12,000 ppm

12,000 ppm

12,000 ppm

20,000 ppm
15,000 ppm
Tetrahydrofuran
THF* “IEC” is based on EN 60079-20-1: 2010 and “ISO” is based on ISO 10156: 2017.

115 /121

15,000 ppm

11 Appendix

Radio Law Certification

Radio Law Certification
This product is certified as complying with radio laws in individual countries and regions as follows.
Information related to radio law certification can be checked on the product LCD screen.
The following actions are prohibited by radio laws. The user and/or retailer may be subject to punishment if
prohibited actions are committed.
・ Use in countries or regions in which radio law certification has not been obtained・ Sale in countries or regions in which radio law certification has not been obtained・ Disassembly or modification of the product・ Removal of certification labels from the product
If this product is used aboard marine vessels, the radio laws of the country bordering the territorial waters
shall apply. In such cases, use shall be prohibited in countries or regions in which radio law certification has
not been obtained.
Check to confirm that industrial, scientific, and medical equipment (e.g., microwave ovens), on-premises
radio stations for mobile identification used in plant manufacturing lines (radio stations requiring a license),and specified low-power radio stations are not operated in the frequency band (2.4 GHz) used by thisproduct. If the product causes radio interference to a radio station for mobile identification, take measures toeliminate radio interference—for example, using the product in a different location or stopping radio
emissions.
The countries where wireless communication can be used vary with each specification. Please check thenameplate attached to the product.
Wireless specifications
Wireless
Protocol:Bluetooth Low Energy
communication
Version:Ver. 4.2
Frequency: 2,402 to 2,480 MHz
Modulation: FSK
Output:Maximum 6 dBm
Radio lawcertification(Country/region)
Radio Act
(Japan)Details
This product contains radio equipment certified to comply withtechnical standards in accordance with the Radio Act. Accordingly, aradio station license is not required when using this product.

Construction design certification number: 001-A07864
Wireless frequency: 2,402 MHz to 2,480 MHz
Maximum wireless output: 6 dBm
RE Directive(EU Countries)

We declare that this equipment complies with the basic requirementsof Directive 2014/53/EU and other relevant provisions. Connect to the
network with radio waves of frequency 2.4 GHz band and maximum
output 6dBm.
FCC compliance(United States)

This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
FCC CAUTION
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11 Appendix

Radio Law Certification
Changes or modifications not expressly approved by the party
responsible for compliance could void the user’s authority to operate
the equipment.
Note: This equipment has been tested and found to comply with thelimits for a Class A digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in acommercial environment. This equipment generates, uses, and canradiate radio frequency energy and, if not installed and used inaccordance with the instruction manual, may cause harmfulinterference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which casethe user will be required to correct the interference at his own
expense.
This equipment complies with FCC radiation exposure limits set forth
for an uncontrolled environment and meets the FCC radio frequency(RF) Exposure Guidelines. This equipment has very low levels of RFenergy that is deemed to comply without testing of specific absorption
rate (SAR).

IC compliance(Canada)This device complies with Industry Canada’s licence-exempt RSSs.
Operation is subject to the following two conditions:(1) This device may not cause interference; and(2) This device must accept any interference, including interference
that may cause undesired operation of the device.
Le présent appareil est conforme aux CNR d’Industrie Canada
applicables aux appareils radio exempts de licence. L’exploitation est
autorisée aux deux conditions suivantes :1) l’appareil ne doit pas produire de brouillage;2) l’utilisateur de l’appareil doit accepter tout brouillage radioélectriquesubi, même si le brouillage est susceptible d’en compromettre lefonctionnement.
This equipment complies with IC radiation exposure limits set forth for
an uncontrolled environment and meets RSS-102 of the IC radio
frequency (RF) Exposure rules. This equipment has very low levels of
RF energy that is deemed to comply without testing of specificabsorption rate (SAR).
Cet équipement est conforme aux limites d’exposition aux
rayonnements énoncées pour un environnement non contrôlé etrespecte les règles d’exposition aux fréquences radioélectriques (RF)CNR-102 de l’IC. Cet équipement émet une énergie RF très faible qui
est considérée comme conforme sans évaluation du débit d’absorption
spécifique (DAS).

KCC(KOREA)

Identification code: R-C-GD5-GX-3RPro_RIKEN
Compliance approval applicant: Riken Keiki Co., Ltd.
Product name: Portable Gas Monitor
Model: GX-3R Pro
Manufacturer: Riken Keiki Co., Ltd.
Country of manufacture: Japan

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11 Appendix

Radio Law Certification
Class A device (broadcast communication device for business use)
This product is a radio wave transmitting device for business use(Class A), and is intended for use in non-household locations.
Retailers and users must pay attention to this point.
A급방송통신기자재)(A이 기기는 업무용급) 전자파적합기기로서 판매자 또는 사용자는이 점을 주의하시기 바라며, 가정외의 지역에서 사용하는 것을목적으로 합니다.

IMDA(SINGAPORE)기기(업 무 용

Certification label:
Comlies with
IMDA Standards
DA107653

ANATEL(BRASIL)

MODEL：GX-3R Pro
Approval number: 01530-19-12084

・ ANATEL Resolution 680 descriptive requirements
This equipment is not entitled to protection against harmfulinterference and may not cause interference in duly authorized
systems
Este equipamento não tem direito à proteção contra interferência
prejudicial e não pode causar interferência em sistemas
devidamente autorizados
・ANATEL Web“Para consultas, visite：www.anatel.gov.br”
ACMA(AUSTRALIA)

MODEL：GX-3R Pro

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11 Appendix

SGS(TAIWAN)Radio Law Certification

Approval certification number:Dry batteries: CCAM19LP0891T2
Lithium batteries: CCAM19LP0890T0
Model: GX-3RPROIn accordance with NCC Administrative Regulations on Low PowerRadio Wave Emitting Electrical Devices:
Article 22 Any alteration of the frequency or voltage of approved
models of low power radio wave emitting electronic
devices is prohibited.
Article 14 The use of low power radio wave emitting electricaldevices shall not interfere with legally-compliant
communications or impair aircraft or maritime safety.
In the case of infringement, the use of such devices
shall be prohibited until compliance is achieved.
The aforementioned legally-compliant communications refer to radio
communications operated in accordance with the Telecommunications
Act. Low power radio wave emitting electrical devices are legallyrequired to be susceptible to interference from ISM bandcommunications.
Minsvyaz（Russia）

Радиоэлектронные средства технологии «Bluetooth»в полосе радиочастот 2400 - 2483,5 МГц смаксимальной эквивалентной изотропно
излучаемой мощностью передатчика не более
2,5 мВт.

SRRC（CHINA）

Approval certification number:Dry batteries: CMIIT ID：2020DP3197
Lithium batteries: CMIIT ID：2020DP1516
Model: GX-3RPRO
Protocol: Bluetooth Low Energy
Version: Ver. 4.2
Frequency: 2,402 to 2,480 MHz
Modulation: FSK
Output: Maximum 6 dBm

119 /121

11 Appendix
NBTC（THAI）

Radio Law Certification
This telecommunication equipment conforms to the standard or
technical requirements of NBTC.

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11 Appendix

Limited Warranty and Limitation Liability

Limited Warranty and Limitation Liability
RIKEN KEIKI CO.,LTD. (RIKEN) warrants the product to be free from defects in material and workmanshipunder normal use and service for a period of three years (one year for NH3 sensors only), beginning on thedate of shipment to the buyer. This warranty extends only to the sale of new and unused products to theoriginal buyer. RIKEN’s warranty obligation is limited, at RIKEN’s option, to repair or replacement of a defective
product that is returned to a RIKEN KEIKI Quality control center located in Japan within the warranty period.
In no event shall RIKEN’s liability hereunder exceed the purchase price actually paid by the buyer for the
Product.
This warranty does not include:a) fuses, disposable batteries or the routine replacement of parts due to the normal wear and tear of the
product arising from use;b) any product which in RIKEN’s opinion, has been misused, altered, neglected or damaged, by accident or
abnormal conditions of operation, handling or use;c) any damage or defects attributable to repair of the product by any person other than an authorized dealer,or the installation of unapproved parts on the product; or
The obligations set forth in this warranty are conditional on:a) proper storage, installation, calibration, use, maintenance and compliance with the product manual
instructions and any other applicable recommendations of RIKEN;b) the buyer promptly notifying RIKEN of any defect and, if required, promptly making the product available
for correction. No goods shall be returned to RIKEN until receipt by the buyer of shipping instructions fromRIKEN; andc) the right of RIKEN to require that the buyer provide proof of purchase such as the original invoice, bill ofsale or packing slip to establish that the product is within the warranty period.
THE BUYER AGREES THAT THIS WARRANTY IS THE BUYER’S SOLE AND EXCLUSIVE REMEDY AND
IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TOANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. RIKENSHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR BASED ON CONTRACT, TORTOR RELIANCE OR ANY OTHER THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion orlimitation of incidental or consequential damages, the limitations and exclusions of this warranty may not apply
to every buyer. If any provision of this warranty is held invalid or unenforceable by a court of competentjurisdiction, such holding will not affect the validity or enforceability of any other provision.
Contacting RIKEN KEIKI
Email us at: intdept@rikenkeiki.co.jp
Visit RIKEN KEIKI website at: https://www.rikenkeiki.com/
JAPAN: +81-3-3966-1113

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11 Appendix

Revision or Abolition History

Revision or Abolition History
Edition

RevisionIssue date

0First issue2021/4/6

1

Update Declaration of Conforminty

2021/7/21

2

Update Declaration of Conforminty

2021/10/29

3

Error correction

2021/12/7

4
5
6
7
8

4-1 note added, 6-2-2 reading list added, 6-4-4 bump expiration dateselection changed, 6-4-6 alarm point setting lower limit changed,
note added
6-4-3 Calibration expiration date interval changed,
7-2-8 Calibration gas concentration setting range Updated
7-2-8 corrections, notes about the combustible gas conversion
function and long-ife battery added, NH3 added, DoC updated
Filter for SO2 sensor changed, Note for ESR-A1CP added,
Man down alarm upper limit changed, Part number for Data Logger
Management program corrected
1-5 UKCA marking added, 2-4 applicable standards added, UKCA
DoC added

2022/3/15
2022/6/3
2022/8/1
2023/6/28
2023/9/11

9UKEX and UKCA deleted, DoC updated

2024/1/10

10

2-4 specific conditions of use added, DoC updated

2024/5/31