PT0E-20410

Portable Gas Monitor

GX-3R(MED specification)
Operating Manual(PT0-164)

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 ............................................................................................................................................ 4
1-1. Introduction ............................................................................................................................................ 4
1-2. Intended use .......................................................................................................................................... 4
1-3. DANGER, WARNING, CAUTION, and NOTE ....................................................................................... 6
1-4. Checking standards and explosion-proof specifications ....................................................................... 6
2 Important Safety Information ......................................................................................................................... 7
2-1. Danger information ................................................................................................................................ 7
2-2. Warning information ............................................................................................................................... 8
2-3. Caution information ................................................................................................................................ 9
2-4. Safety information ................................................................................................................................ 11
3 Product Configuration.................................................................................................................................. 14
3-1. Main unit and standard accessories .................................................................................................... 14
Main unit .............................................................................................................................................. 14
Standard accessories.......................................................................................................................... 15
3-2. Part names and functions .................................................................................................................... 16
Main unit .............................................................................................................................................. 16
LCD display ......................................................................................................................................... 17
4 Alarm Activation ........................................................................................................................................... 18
4-1. Gas alarm activation ............................................................................................................................ 18
4-2. Fault alarm activation ........................................................................................................................... 20
5 Usage Instructions....................................................................................................................................... 21
5-1. Before using the product ...................................................................................................................... 21
5-2. Preparing startup ................................................................................................................................. 21
5-2-1. Charging the lithium ion battery................................................................................................ 21
5-3. Startup .................................................................................................................................................. 23
Turning on the power .......................................................................................................................... 23
Screen transition from powering on to displaying measurement screen ........................................... 24
5-4. Air calibration........................................................................................................................................ 27
Air calibration procedure ..................................................................................................................... 27
5-5. Gas detection ....................................................................................................................................... 28
5-5-1. Basic operating procedures ...................................................................................................... 28
5-5-2. Measurement mode .................................................................................................................. 29
5-6. Turning off the power ........................................................................................................................... 31
6 Setting Procedure ........................................................................................................................................ 32
6-1. Display mode ....................................................................................................................................... 32
6-1-1. Displaying display mode ........................................................................................................... 32
6-1-2. Display mode display details .................................................................................................... 32
6-2. Display mode settings .......................................................................................................................... 34
6-2-1. Clearing PEAK value display .................................................................................................... 34
6-2-2. Combustible gas conversion setting ........................................................................................ 35
6-2-3. Long-life battery setting ............................................................................................................ 37
6-2-4. Calibration data display ............................................................................................................ 38
6-2-5. Bump data display .................................................................................................................... 39
6-2-5. Alarm setpoint display............................................................................................................... 40
6-3. User mode ............................................................................................................................................ 41
6-3-1. Displaying user mode ............................................................................................................... 41
6-3-2. User mode settings ................................................................................................................... 42
6-4. User mode settings .............................................................................................................................. 44
6-4-1. Bump test .................................................................................................................................. 44
6-4-2. Calibration ................................................................................................................................. 44
6-4-3. Calibration expiration date setting ............................................................................................ 44
6-4-4. Bump test setting ...................................................................................................................... 47
6-4-5. Alarm setpoint setting ............................................................................................................... 52

2 / 91

6-4-6. Lunch break: ON/OFF .............................................................................................................. 54
6-4-7. Confirmation beep setting ........................................................................................................ 55
6-4-8. LCD lighting time setting .......................................................................................................... 57
6-4-9. Key tone: ON/OFF .................................................................................................................... 57
6-4-10. Display mode item display: ON/OFF ...................................................................................... 58
6-4-11. Date and time setting .............................................................................................................. 58
6-4-12. User password setting ............................................................................................................ 59
6-4-13. ROM/SUM display .................................................................................................................. 60
7 Maintenance ................................................................................................................................................ 61
7-1. Maintenance intervals and maintenance items ................................................................................... 61
Maintenance service ........................................................................................................................... 62
7-2. Calibration ............................................................................................................................................ 63
7-2-1. Preparation for calibration ........................................................................................................ 63
7-2-2. Calibration setting menu ........................................................................................................... 65
7-2-3. Air calibration ............................................................................................................................ 66
7-2-4. Auto calibration ......................................................................................................................... 67
7-2-5. Switch from AUTO calibration to measurement start screen ................................................... 69
7-2-6. Auto calibration cylinder setting ................................................................................................ 70
7-2-7. Auto calibration gas concentration selection ............................................................................ 71
7-3. Bump test ............................................................................................................................................. 72
7-3-1. Perform bump test (BUMP TEST) .................................................................................................... 72
7-3-2. Switching from bump test (BUMP TEST) to measurement start screen .......................................... 73
7-4. Cleaning instructions ............................................................................................................................ 74
7-5. Parts replacement ................................................................................................................................ 75
7-5-1. Periodic replacement parts ....................................................................................................... 75
7-5-2. Filter replacement ..................................................................................................................... 76
8 Storage and Disposal .................................................................................................................................. 79
8-1. Procedures for storage or when not in use for extended periods ....................................................... 79
8-2. Procedures for use after storage ......................................................................................................... 79
8-3. Product disposal................................................................................................................................... 80
9 Troubleshooting ........................................................................................................................................... 81
9-1. Product abnormalities .......................................................................................................................... 81
9-2. Reading abnormalities ......................................................................................................................... 83
10 Product Specifications ................................................................................................................................. 84
10-1. Specifications list ............................................................................................................................... 84
10-2. Accessory list ..................................................................................................................................... 87
11 Appendix ...................................................................................................................................................... 88
Data logger function .................................................................................................................................... 88
100 %LEL = ppm conversion list ................................................................................................................. 90
Limited Warranty and Limitation Liability .................................................................................................... 91

3 / 911
1Product Overview

1-1. Introduction
Thank you for your purchase of the GX-3R MED specification Portable Gas Monitor (“product”
hereinafter). First, please confirm that the model number of the product you purchased matches the model
number of the product covered by this manual.
The product should be used only by fully-trained personnel.
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 ourcertified service engineers. Please contact RIKEN KEIKI.
This manual describes how to use the product and provides product specifications. Make sure you haveread and fully understood the contents of this manual before using the product. This applies both to firsttime users 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 three types of sensors to enable detection of four
different gas types using a single unit.
The product comes in several different types, depending on the combinations of detection target gases.
Check the specifications 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.

4 / 91

Check the name plate on the product to identify the TYPE of the product you have and the gases to be
detected from the TYPE. The TYPE is listed after the model number.
If the gas to be detected is a combustible gas, the calibration gas, Isobutane (HC) or Methane (CH4), is
printed on the left side of the QR code.

TYPE
GX-3R(EX TYPE A)
146010001RN / 1903
銘板印字例
i-C4H10:LEL=1.3vol%Sample of the name plate
Back of the product

Calibration gas for the
combustible gas sensor
For Isobutane：i-C4H10
For Methane：CH4<List of detection target gases (installed sensor models) by type>
Detection target gases (installed sensor models)
CarbonCombustible
HydrogenCarbonTYPE
monoxide/hydrogen
Oxygengas
sulfidemonoxide(ESR-X13P)<HC or CH4>
sulfide(ESR-A13i) (ESR-A13P)(NCR-6309)(ESR-A1DP)TYPE ATYPE BTYPE CTYPE CHTYPE D
TYPE E
TYPE F
TYPE FH
TYPE GTYPE ITYPE IH
TYPE K
TYPE LTYPE P
*2
















Carbonmonoxide(ESR-A1CP)
*1





















*1 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.)*2 ATEX / IECEx specifications only

5 / 91

1-3. 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 fatal or
serious injury to persons or serious damage to property.

WARNING

This indicates situations in which improper handling may result in serious
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.

1-4. 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

6 / 91

2
2

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.

7 / 912-2. Warning information
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• Never 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.
Battery level check• Check the battery level before using the product. The battery may be depleted when the product isused for the first time or after extended periods without use. Charge the battery 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 the battery 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.
• 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 orconnect the suction pump unit RP-3R (sold separately) to detect the atmosphere from the outsideof the confined 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.

8 / 91

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.
Continuous use environment:-20 °C to +50 °C
Temporary use environment:-40 °C to +60 °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 productmay affect readings. If walkie-talkies or other radio wave transmitting devices are used, thesemust be used away from the product where they do not affect operation.
‧
Do not use the product near devices that emit strong electromagnetic radiation (highfrequency 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.
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, thesensor 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.

9 / 91

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 explosion-proof,
waterproof, dustproof, and gas detection performance.
‧ Do not use the product while charging it.
• Do not poke the buzzer sound opening 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 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 in anenvironment similar to the usage location before performing air calibration in fresh air.
‧ When wiping the product clean, do not splash water on it or use organic solvents like alcohol andbenzine. Doing so may discolor or damage the surfaces of the product.
‧ After a period of extended storage, be sure to perform calibration before resuming use. For
information on readjustment including calibration, please contact RIKEN KEIKI.

10 / 912-4. Safety information
Necessary information for explosion proof construction of Model GX-3R.

Overview
The GX-3R can measure up to 4 gases using 3 sensors.
The GX-3R measures the combustible gases (LEL), oxygen (O2), hydrogen sulfide (H2S), and carbon
monoxide (CO).
This model displays measurement results on an LCD and issue gas alarms (via LED and buzzer) as
needed.
Gas sampling is by diffusion. The model does not have internal suction pumps.

Power sources
The GX-3R draws power from an integrated rechargeable Li-ion battery that is not user-replaceable.
A dedicated AC adapter is used for recharging the Li-ion battery.
<ATEX/IECEx specification>
Explosion proof
Intrinsically safe explosion-proof construction and flame-proof enclosures
structure
Specification for safety
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 17.0050X
・ ATEX ： DEKRA 17 ATEX 0103X
・ IEC 60079-0:2017
・ EN IEC 60079-0:2018
・ IEC 60079-1:2014-06 ・ EN60079-1:2014
・ EN60079-11:2012
・ IEC 60079-11:2011
・ EN50303:2000

SPECIFIC CONDITIONS OF USEWhen the portable gas monitor is equipped with thermo catalytic gas sensor model NCR-6309 in typeof protection 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.

11 / 91

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.

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

12 / 91

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

13 / 913
3

Product Configuration

3-1. Main unit and standard accessories
Open the box and packaging and inspect the product and accessories.
If anything is missing, contact RIKEN KEIKI.

Main unit
For detailed information on the names and functions of product parts and the LCD display, see “3-2. Part
names and functions” on page 16.

GX-3R main unit

14 / 91

Standard accessories
AC adapter
×1

Rubber protection
cover
×1
Protects the productfrom impact if it is hit
by something or
dropped.

Alligator clip
×1
Allows attaching the
product to a pocket.
* ATEX/IECEx
specification only

Calibration adapter(simple type)
×1
Used to perform gas
calibration and bumptest.
* ATEX/IECEx
specification only

Hand strap
×1

15 / 913-2. Part names and functions
This section describes the names and functions of the various parts of the main unit and 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.
Turns the power on and off. This button is also used to confirm
settings in setting mode.

(1)

LCD display(2)

POWER/MODE button(3)

AIR button(4)

Alarm LED arrays

Performs air calibration in measurement mode. This button is
also used to select settings in setting mode.
The lamps flash red when an alarm occurs.

(5)

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

(6)
(7)

Buzzer sound opening
Battery charging contact

Emits operating and alarm sounds. (Do not block.)
Contact for connecting the charger (EPU15-102-L6)(8)

Sensors

Sensors are installed for detecting individual gases.

CAUTION• Do not poke the buzzer sound opening 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 LCD display. Doing so will impair waterproof and dustproof
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 adjustment of
the internal pressure of the product, which may result in malfunctions.

16 / 91

NOTE• In this operating manual, buttons that have multiple functions are described as follows in theoperational procedures:
Example: “POWER/MODE button” is described as follows:• POWER button when turning the power on and off• MODE button when confirming settings

LCD display
(2)
(1)
(3)

(4)

(5)

(6)

(7)

(1)
(2)
(3)
(4)
(5)
(6)
(7)

Name
Operation status
display
Clock display
Combustible gas
concentration
Oxygen concentration
Carbon monoxide
concentration
Hydrogen sulfide
concentration
Battery level icon

Main function
Indicates the operation status. Blinks when normal.
Displays the time.
Displays gas concentrations as numerical readouts.
The concentration readout is updated every 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 battery levels. See NOTE below for a guide to battery
level indications.

NOTE• Approximate battery levels are indicated as follows:
Sufficient
Low
Needs charging.
The battery icon will blink if battery levels drop even further.
• 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 “6-4-3. Calibration expiration date setting” on page 44.
• If the long-life battery function is enabled, “L” is displayed in the upper
left of the LCD.
• “M” is displayed in the upper left of the LCD when user mode is selected.

17 / 91

4

Alarm Activation

4

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 < M OVER alarm < OVER alarm < integrated alarm point < TWA
alarm < STEL alarm<Default settings>
Item

Measuredgas

Measurement
range
Service range
Minimum
resolution

Combustible gas
HC or CH4

O2

CO

H2S

0 to 100 %LEL

0 to 25 %0 to 500 ppm

0 to 30 ppm-

25 to 40 %500 to 2,000 ppm

30 to 200 ppm

1 %LEL

0.1 %

1 ppm

0.1 ppm

L: 19.5 %LL: 18.0 %H: 23.5 %OVER alarm:40.0%
MOVER alarm：-1.0vol%

1st alarm:
25 ppm
2nd alarm: 50 ppm
3rd alarm:
1,200 ppm
TWA alarm: 25 ppm
STEL alarm: 200 ppm
OVER alarm:2,000 ppm
MOVER alarm：-50ppm

1st alarm:
5.0 ppm
2nd alarm:
30.0 ppm
3rd alarm:
100.0 ppm
TWA alarm: 1.0 ppm
STEL alarm: 5.0 ppm
OVER alarm: 200.0 ppm
MOVER alarm：-10.0ppm

1st alarm:
10 %LEL
2nd alarm: 25 %LEL
3rd alarm:
50 %LEL(General
OVER alarm: 100 %LEL
ATEX/IECEx
specification) MOVER alarm：-10%LEL

Alarm
setpoint

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 “6-4-5. Alarm setpoint setting” on page 52. (For items with“-” shown, the setpoint cannot be changed.)• M OVER alarm (minus sensor failure) is issued 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.

18 / 91

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

First
alarm
Repeatedalternatestrong andweak beeps
at about 1second
intervals:“Beep, beep”

Alarm LEDarray
flashing

Repeated
flashing at
about 1second
intervals

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

Vibration

Third
TWA
alarm
alarm
Repeated
Repeatedalternate
alternatestrong andstrong andweak beeps
weak beeps
at about 1at about 0.5second
secondintervals:
intervals:“Beep, beep, “Beep, beep”
beep, beep”
Repeated
Repeated
flashing at
flashing at
about 1about 0.5second
secondintervals
intervals
Vibration when alarm occurs

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

STEL
alarm
Repeatedalternatestrong andweak beeps
at about 1second
intervals:“Beep, beep”
Repeated
flashing at
about 1second
intervals

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

M OVERalarm
Repeatedintermittent
beeps atabout 1second
intervals:“Beep, beep”
Repeated
flashing at
about 1second
intervals
None

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

Reset

Third alarm
setpoint
First alarm
setpoint
Second alarm
setpoint

Third alarm
setpoint
Second alarm
setpoint
First alarm
setpoint

0

0

Time

Time

Alarm lamp
BuzzerAlarm lamp
Buzzer<Gas alarm display>

If a gas alarm occurs, the alarm type is indicated at the bottom of the screen, and the corresponding gas
concentration display blinks.
If the detection range is exceeded (over scale), “OVER” blinks at the bottom of the screen and “∩∩∩”blinks in the gas concentration display area.

Display example
Alarm
type
LCD
display

First
alarm
“WARNING”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.

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

Secondalarm“ALARM”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.

Third
alarm
“ALARM H”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.

TWA
alarm
“TWA”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.

19 / 91

STEL
alarm“STEL”
appears at
the bottom of
the screen,
and the gas
concentration
value blinks.

OVER
alarm
“OVER”
appears at
the bottom of
the screen,and “∩∩∩”
blinks in thegasconcentration
value displayarea.

M OVERalarm“M OVER”
appears at
the bottom of
the screen,and “”
blinks in thegasconcentration
value display
area.

WARNING• A gas alarm indicates the presence of extreme danger. The user must take appropriate action after
taking appropriate steps to ensure safety.

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.

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 abnormality, clock abnormality, battery voltage abnormality, and sensor
abnormality.
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:

System abnormality

Clock abnormality

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 “

20 / 91

9

Troubleshooting” on page 81.

55

Usage 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 have been altered from an external device, be sure to confirm that thesettings have been altered correctly.

5-2-1. Charging the lithium ion battery
Before using the product for the first time or if battery levels of the lithium ion battery are low, charge using
the provided charger, as described below.

DANGER• Charge the battery using the provided charger in a safe place.
• Charge the battery at ambient temperatures between 0 °C and 40 °C.

21 / 91CAUTION• Be sure to turn off the power for the product before charging the battery.
• Do not use the product while charging the battery. The measurements obtained will not be correct.
Additionally, doing so will degrade the 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.
• The main unit may get hot during charging. This does not indicate 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 it is 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.

<Charging the lithium ion battery>1

Insert the DC plug of thecharger into the battery
charging contact of themain unit.

DC plug

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.

22 / 915-3. Startup
When the power is turned on, various settings including date and time and alarm setpoints are displayed,
and then the measuring mode screen is displayed.

Turning on the power
Hold down the POWER button (for atleast 3 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 product vibrates.
Before using the product, check that these operations function correctly.

23 / 91

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 )Calibration expiration datedisplay screen

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

Battery level/alarm patterndisplay

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 andthen the measurement
screen is displayed.

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 63.
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.

24 / 91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 72.
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 measurementmode after 6 seconds when there is no action.
• With models that detect combustible gases, the screen shown on the rightmay be displayed with the buzzer sounding and lamp flashing after thebattery level and alarm pattern are displayed. When the screen shown atright is displayed, the alarm is automatically cleared by pressing the
MODE button or after 5 seconds.
• The screen shown at right is displayed when the combustible sensor is poisoned by silicone
compounds, halides, or other substances. When the screen shown on the right is displayed, thecombustible 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 27.

25 / 91

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. If no button is pressed for five seconds, the measurement data is automaticallyretained.
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 47.
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 44.
Date and time
Displays the date and time. The date and time can be set by following the instructions described in“6-4. User mode settings” on page 44.
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.
Battery level/alarm pattern
Displays the battery level (voltage) and alarm pattern setting (AL-L <self-latching>) on the screen.
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.
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.
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.
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 on 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.
Not displayed on models where CO and H2S are not included in the detection target gases.
TWA alarm setpoint (TWA and STEL are displayed only on 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.

26 / 91

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 start-up, 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 in an

NOTE• When using the combustible gas conversion function with the long-life battery setting ON, in principle, theindicated 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 isrecommended to use the product with the long-life battery setting OFF.

Air calibration procedure1

Hold down the AIR button on themeasurement mode 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.

2

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

27 / 91

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. If interference gases are present, it will not be possible to calibrate the product correctly,
resulting in danger if actual gas leaks occur.
• 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 the battery 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.

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<Gas alarm state><Fault alarm state>(Self-latching <reset after recovery
to normal state>)(Self-latching <reset after turning
off the power>)

Measuredvalue
Blinking

28 / 91

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

Combustible gas(%LEL)

OxygenCarbonmonoxideHydrogensulfideDisplay 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 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 you press the MODE button.
• 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.

29 / 91• 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: richConcentration display: H2• Sensitivity may be reduced temporarily if the carbon monoxide sensor comes into contact with gas
at concentrations exceeding its measurement range. If the sensor has come into contact with highconcentration gas, be sure to allow it to stand in fresh air and perform air cleaning.
• Sensitivity may be reduced temporarily if the hydrogen sulfide (H2S) sensor comes into contact withgas at concentrations exceeding its measurement range. If the sensor has come into contact withhigh-concentration gas, be sure to allow it to stand in fresh air and perform air cleaning.
• 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.

30 / 91

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 off the power.

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.

Power-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.

31 / 91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 (or minimum
oxygen concentration) detected
since the power was turned on.

32 / 91

LCD display

Reference page
Hold down the
AIR button tojump to the PEAK
value clearing
screen on page34.

Screen notation(Setting item)

STEL(STEL display)* Displays only CO and
H2S.

TWA
(TWA display)* Displays only CO andH2S.

HC GAS(Combustible gas
conversion seting)

Display contents
Displays the STEL value since thepower was turned on.
The STEL value refers to the sumof 15 pieces of average value
data for measured values over a
period of 60 seconds divided by
15.
The value is refreshed every 60
seconds.
Displays the TWA value since thepower was turned on.
The TWA value refers to theintegrated average value of
measured values over a period of
60 seconds divided by 480.
The value is refreshed every 60
seconds.

LCD display

Reference page

-----

-----

Selects the conversion gas fromthe list of gases preregistered in
the product.

Press the AIR
button to jump to
the setting screen
on page 35.

Enables/disables the long-lifebattery setting.

Press the AIR
button to jump to
the setting screen
on page 37.

Displays the calibrated gas type
and the calibration date.

Press the AIR
button to jump to
the display screen
on page 38.

BUMP DATA(Bump data display)

Displays the bump test gas type
and the test date.

Press the AIR
button to jump to
the display screen
on page 39.

DATE
Date, time, andtemperature display

Displays the date, time, andtemperature.

* Displayed only on models
that detect combustible
gases

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

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

ALARM-PT(Alarm setpoint
display)

Displays various alarm setpoints.

-----

Press the AIR
button to jump to
the confirmation
screen on page
40.

NOTE
• 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 gas conversion setting) 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.

33 / 91

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.

3

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

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

34 / 91

6-2-2. Combustible gas conversion setting
Combustible gas measurements can be displayed as a concentration converted to a gas registered in the
product.
The following combustible gases can be converted:<Conversion gas list>
Gas conversion
Conversion gas

Gas name
displayed

CH4

i-C4H10

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

CH4
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 rightmay be displayed with the buzzer sounding and lamp flashing after the
power is turned on or calibration is performed. When the screen shown atright is displayed, the alarm is automatically cleared by pressing the
MODE button or after 5 seconds.
• The screen shown at right is displayed when the combustible sensor is poisoned by silicone
compounds, halides, or other substances. When the screen shown on the right is displayed, thecombustible 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.

35 / 91

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 to 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 "1-2. Intended use" and confirm whether the gas can be read or not in the"Conversion gas list" in "6-2-2. Combustible gas conversion setting.” Even if a combustible 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 the conversion gas, the gases with "×" in the"Conversion when the conversion is restricted" column of the "Conversion gas list" do not affect theindicated 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

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

2

Press the AIR button several times todisplay 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

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

36 / 91

6-2-3. Long-life battery settingThis enables/disables the long-life battery 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 the long-life battery setting is enabled, no minus sensor alarm will be issued for the combustible
gas sensor.
• The “L” lights up at the top of the screen when the long-life battery setting 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

Press the MODE button on the measurement screen several times todisplay the LONG.BATT screen.

2

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.

37 / 91

6-2-4. Calibration data display
This displays 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 to select “YES” or “NO”.
Pressing the AIR button cycles the display through “CH4” → “O2” → “H2S” → “CO” in sequence.

3

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

38 / 91

6-2-5. Bump data display
This displays the bump test date.

NOTE• Bump data is not displayed if the bump test expiration date setting is disabled in user mode.
• After the gas calibration, the date is updated automatically.

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

2 Press the AIR button to select “YES” or “NO”.
Pressing the AIR button cycles the display through “CH4” → “O2” → “H2S” → “CO” → “CO2” → ...

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

39 / 91

6-2-5. Alarm setpoint display
This allows alarm setpoints to be displayed and testing of LED, buzzer, and vibrator operations.

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

1 Press the MODE button on the measurement screen several times todisplay the ALARM-PT screen.

2 Press the AIR button.
Pressing the AIR button cycles the display through “F.S.” (FULL SCALE) → “WARNING” →“ALARM” → “ALARM H” → “STEL” → “TWA” → “F.S.” (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.

40 / 91

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

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 “START”, thenpress 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
configuring 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 “6-4-12. User password setting” on page59.

41 / 91

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

LCD display

Reference
page

BUMP (Bump test)

P. 44

GAS CAL (Calibration)

P. 44

CAL SET (Calibration expiration date setting)

P. 44* Displayed on ATEX/IECEx specification only

BUMP SET (Bump test setting)

P. 47

ALARM-PT (Alarm setpoint setting)

P. 52

LUNCH (Lunch break: ON/OFF)

P. 54

BEEP (Confirmation beep setting)

P. 55

BL TIME (LCD lighting time setting)

P. 57

KEY TONE (Key tone: ON/OFF)P. 57

DISP SET (Display mode item display: ON/OFF)

P. 58

42 / 91

Screen display (setting item)

LCD display

Reference
page

DATE (Date and time setting)

P. 58

PASSWORD (Password setting)

P. 59

ROM/SUM (ROM/SUM display)

P. 60

START (Measurement start)

43 / 91

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 72.

6-4-2. Calibration
The product’s GAS CAL mode allows automatic calibration (AUTO CAL) using preset gas concentrationsin 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 63.

6-4-3. Calibration expiration date settingThis section describes “Calibration expiration date: ON/OFF”, “Calibration expiration date interval”, and“Operation after calibration date expired”.
* 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 SET”, then press
the MODE button.
The calibration expiration date setting menu screen
is displayed.

2

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

44 / 91

Setting item

LCD display

CAL RMDR<Calibration expiration date: ON/OFF>P. 45

CAL INT<Calibration expiration date interval>
P. 46

CAL EXPD<Operation after calibration dateexpired> P. 46

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

1

Press the AIR button to select “CALRMDR”, then press the MODE button.
The calibration expiration date ON/OFF selection isdisplayed.

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. The default
setting is “ON”.
* ATEX/IECEx specification only

3

Reference page

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

45 / 91<Calibration expiration date interval>
This lets you select the number of days until the calibration expires.

1

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

2

Press the AIR button to select the
number of days for calibration
expiration.
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 “CAL
EXPD”, then press the MODE button.

2

Press the AIR button to select theoperation after the calibration date has
expired.
Pressing the AIR button displays the following
operations after calibration date expiration.
・ CONFIRM: 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”.

3

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

46 / 91

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

<Bump test setting menu>
1

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

2

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

Setting item

LCD display

Reference page

SETTINGS<Bump time selection>P.48<Bump tolerance selection>P.48<Calibration time selection after bumptest>P.49<Calibration after bump test:
ON/OFF>P.49

BUMP.RMDR<Bump test expiration date display:
ON/OFF>P.50

BUMP INT<Bump expiration date interval
selection>P.50

BUMP.EXPD<Operation setting after bump test
expiration>P.51

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.

47 / 91

<Bump time selection>
This sets the time for introducing the test gas.

1

Press the AIR button to select“SETTINGS”, 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

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

4

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“SETTINGS”, then press the MODE
button.
The bump test setting menu is displayed.

2

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

3

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” %.

4

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

48 / 91<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“SETTINGS”, then press the MODE
button.
The bump test setting menu is displayed.

2

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

3

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”.

4

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“SETTINGS”, then press the MODE
button.
The bump test setting menu is displayed.

2

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 fails.

3

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

4

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

49 / 91

<Bump test expiration date display: ON/OFF>This selects the notification for bump test expiration.

1

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

2

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”.

3

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

<Bump 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
INT”, then press the MODE button.
You can select the number of days until the bump
test expiration date.

2

Press the AIR button to select thebump test expiration date interval.
Pressing the AIR button lets you select the bump test
expiration date interval from 0 to 365 days. The
default setting is “30” days.

3

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.

50 / 91

<Operation setting after bump test expiration>
This selects the operation after the bump test expiration date display.

1

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

2

Press the AIR button to select theoperation after bump test expiration
operation confirmation.
Pressing the AIR button displays the following
operations after bump test expiration:
Pressing the AIR button displays the following
operations after calibration date expiration.
・ CONFIRM: 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”.

3

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

51 / 91

6-4-5. 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 using one-digit units.
Detection target gas

1 digitCombustible gas (HC/CH4)

1 %LEL

Carbon monoxide (CO)1 ppm

Hydrogen sulfide (H2S）

0.1 ppm

Detection target gas

1 digitOxygen (O2)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)First/second alarm
Lower limit
Upper limit
0.0 %
20.0 %

Upper limit
60 %LEL
2,000 ppm
200.0 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-PT”, thenpress the MODE button.

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 53).
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 isdisplayed.

4

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 gas, the STEL and TWA setting screens are
displayed after the above steps. Set these in the

52 / 91

same way.
“END” appears and the alarm setpoint reset screen
appears.

NOTE• For information on how to reset settings, see “Resetting alarm setpoints” on page 53. 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 18.

<Resetting alarm setpoints>
This restores alarm setpoints to their default settings.

1

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

2

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

3

Press the MODE button.
The alarm setpoint reset confirmation screen is displayed.

To cancel resetting, press the AIR button.

4

Press the MODE button.

The alarm setpoint reset confirmation screen is displayed.

5

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

53 / 91

6-4-6. Lunch break: ON/OFF
This lets you enable and disable the lunch break function. The lunch break function retains 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”, then press
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

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 userwhether to retain the TWA and PEAK values from the last time the power was turned off andcontinue measurement or to reset the values when the power is turned on.

54 / 91

6-4-7. 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.

<Confirmation beep setting menu>
1

Press the AIR button on the user modemenu to select “BEEP”, then press 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

LCD display

Reference page

<Beep operation setting>

BEEP SEL

P. 56

BEEP INT<Beep interval setting> P. 56

ESCAPE

55 / 91

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 “BEEPSEL”, then press the MODE button.
The beep operation selection screen is displayed.
However, if you change the setting, the operations of"BUMP / CAL", "ALM ALRT" and "B / C / ALM" will
stop.

2

Press the AIR button.
Pressing the AIR button displays the following
screens in sequence:
・ OFF
・ LED (LED lights only)
・ BUZZER (buzzer only)
・ LED+BUZZ (LED and buzzer)
・ BUMP/CAL・ ALARM ALRT・ B/C/ALM
The default setting is “OFF”.

3

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.

1

Press the AIR button to select “BEEP
INT”, 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” minutes.

3

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

56 / 91

6-4-8. LCD lighting time settingThis lets you set the duration for which the LCD display remains lit.

1

Press the AIR button on the user modemenu to select “BL 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.

6-4-9. Key tone: ON/OFF
This enables/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

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

57 / 91

6-4-10. Display mode item display: ON/OFF
This lets you set whether display mode items that can be set are displayed or hidden.
When set to OFF, items such as “HC GAS” (combustible gas conversion setting) are not displayed indisplay mode.

1

Press the AIR button on the user modemenu to select “DISP SET”, 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 default setting
is “ON”.

3

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

6-4-11. Date and time settingThis sets the date and time of 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.
Press the MODE button after setting the “minute”
item. “END” appears and the display returns to theuser mode menu.

58 / 91

6-4-12. User password settingThis lets you protect access to user mode using a password. The password can be set as a four-digit
number in the range 0000 to 9999.

1

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

2

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

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.
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”.

59 / 91

6-4-13. 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.
・ MAIN ROM
・ SENS. ROM

2

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

60 / 91

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
item

Maintenance details

Daily
maintenance

Monthly
maintenanceRegularmaintenanceBattery level

Check to confirm that battery levels areadequate.

Concentration
display

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







Main unit
operation

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







FilterCheck to confirm that the filter is not dirty.







Alarm test

Test the alarm and check to confirm that thealarm LED arrays, buzzer, and vibrator all
operate correctly.

-





-

-



-

-



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.

61 / 91

Maintenance service
RIKEN KEIKI provides services related to regular maintenanceincluding span adjustment, as well as other adjustments andmaintenance.
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 includes the following main aspects. Please contact RIKEN KEIKI for more
information.

<Main maintenance service details>
Battery level
check
Concentration
display check
Filter check
Alarm test

Checks battery levels.
Checks to confirm that the concentration readout is 0 (or 20.9 % for oxygen meter)using a zero gas.
Zero calibration (zero adjustment) is performed if the reading is not zero.
Checks the dust filter for contamination and clogging.
The filter is replaced if dirty or clogged.
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)
Product
operation check
Consumablepart
replacement

Checks the exterior of the product for dirt and damage; cleans and repairs any
prominent problem areas.
Parts are replaced if cracked or damaged.
Operates the buttons to check function operations and parameters.
Replaces degraded components such as sensors and filters.

62 / 91

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.

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 ESRA13i

Hydrogen sulfide (H2S）

25.0 ppm

Oxygen (O2)ESR-X13P

Oxygen (O2)
Nitrogen diluted

12.0 %

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

Carbon monoxide (CO)50 ppmHydrogen (H2)
air diluted* Hydrogen must be calibrated in the range 10 °C to 30 °C.
* The same applies to bump test gas.
Carbon monoxide (CO)ESR-A1CP

500 ppm

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.

63 / 91

<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 after the reading
increases before calibrating.
ガス袋
Gas sampling
bag

GAS
OUT

GAS
IN

Pump

250mL/minWARNING
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 used 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 orlower than the actual concentrations when measured in environments where hydrogen is alsot

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.

64 / 91

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

LCD display

Reference page

AIR CAL“7-2-3. Air calibration” (P. 66)

AUTO CAL“7-2-4. Auto calibration” (P. 67)“7-2-6. Auto calibration cylinder
setting” (P. 70)“
7-2-7. Auto calibration gas
concentration selection” (P. 71)

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.

65 / 91

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.

NOTE• If air calibration fails, “FAIL” appears next to the measurement for the faulty sensor together with“AIR CAL”. 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. 27)• 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.

66 / 91

3

Release the button when “RELEASE” isdisplayed.
Air calibration is performed.

“PASS” is displayed if air calibration was successful.

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.

7-2-4. Auto calibration
This calibrates for each gas at the specified concentration.

1

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

2

Select the cylinder
for calibration, thenpress the MODE
button.
For information on cylinder
settings, see “7-2-6. Autocalibration cylinder setting”
on page 70.

3

Introduce thecalibration gas, wait
60 seconds, andthen press the
MODE button.

Auto calibration is performed.

67 / 91“PASS” is displayed if auto calibration was
successful.
“FAIL” is displayed if calibration was unsuccessful.

The concentration after auto calibration is displayed.

Moves to the measurement start screen.

CAUTION• Air calibration must always be performed before auto calibration.
• For models with a combustible gas sensor installed, the screen shown on
the right may be displayed after auto calibration. When the screen shownat right is displayed, the alarm is automatically cleared by pressing the
MODE button or after 5 seconds.
• The screen shown at right is displayed when the combustible sensor is poisoned by silicone
compounds, halides, or other substances. When the screen shown on the right is displayed, thecombustible 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• Air calibration must always be performed before auto calibration.

68 / 91

7-2-5. 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“START”, then press the MODE
button.
The LCD lights up completely and will move to themeasurement start screen.

69 / 91

7-2-6. Auto calibration cylinder settingThis section describes how to set gas groups (cylinders) for calibration. Five 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

Press the AIR button and select “CYL
SEL”, then press the MODE button.
Pressing the AIR button displays the gas type andconcentration for cylinders A to E in sequence.

3

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.

4

Press the MODE button on the sensor
selection screen for changing cylinder
settings.

5

Press the AIR button to select acylinder from A to E, then press the
MODE button.
“END” appears and the display returns to thescreen shown in the step 3 returns automatically..

70 / 91

7-2-7. Auto calibration gas concentration selection
This section describes how to select the calibration gas concentration for the individual sensors.
Calibration gas concentration can be set in one-digit units within the setting range.
<Calibration gas concentration setting range>
Detection target gas
Combustible gas (HC)
Combustible gas (CH4)
Hydrogen sulfide (H2S）
Oxygen (O2)
Carbon monoxide (CO)Carbon monoxide (CO)Sensor model
NCR-6309
NCR-6309
ESR-A1DP or
ESR-A13i
ESR-X13P
ESR-A1DP, ESRA1CP, or ESRA13P
ESR-A1CP

Calibration gas
Isobutane (i-C4H10)
Methane (CH4)
Hydrogen sulfide(H2S）
Oxygen (O2)

1 digit
1 %LEL
1 %LEL

Lower limit
1 %LEL
1 %LEL

Upper limit
75 %LEL
75 %LEL0.1 ppm

0.5 ppm

200.0 ppm

0.1 vol%

0.0 vol%

18.0 vol%Carbon monoxide
(CO)

1 ppm

12 ppm

2,000 ppm

Hydrogen (H2)1 ppm

25 ppm

2,000 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 from 10 °C to 30 °C.

1Press the AIR button to select “AUTO
CAL”, then press the MODE button.
The auto calibration screen is displayed.

2

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

3

Press the AIR button to select thecalibration gas type.
Pressing the AIR button displays the detection target
gas in sequence.

4

Pressing the AIR button once more
displays “ESCAPE” and returns thedisplay to the screen in Step 1.
Press the MODE button on the sensor
selection screen for changing
calibration gas concentrations.
The calibration concentration change screen isdisplayed.

5

Press the AIR button to select thecalibration concentration, then press
the MODE button.
“END” appears and the display returns to thescreen shown in the step 3 returns automatically..

71 / 91

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. 63).

1

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

2

Press the AIR button
to select the cylinder
for the bump test,
then press the MODE
button.
Introduce the gas for thebump test.
The bump test is performed.
If calibration is specified to be performed after abump test fails, calibration will be automatically
performed if the bump 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 the bump
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.

72 / 91CAUTION• For models with a combustible gas sensor installed, the screen shown on
the right may be displayed if calibration is performed after a bump test
failure. When the screen shown at right is displayed, the alarm is
automatically cleared by pressing the MODE button or after 5 seconds.
• The screen shown at right is displayed when the combustible sensor is poisoned by silicone
compounds, halides, or other substances. When the screen shown on the right is displayed, thecombustible 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.

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

2

Press the AIR buttonand press “START”
button.

3

Press the MODE button.

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

73 / 91

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.

74 / 91

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>
Recommended
check interval

Recommended
replacement
interval

Quantity

6 months

3 years1*

6 months

3 years1*

6 months

3 years1*

6 months
6 months
6 months
Before andafter use

3 years
3 years
3 years
6 months orwhen contaminated1
1
1

Interference gas
removal filter

3 months

6 months

1

Interference gas
removal filter

3 months

6 months

1

Interference gas
removal filter

3 months

6 months

1

Interference gas
removal filter

3 months

6 months

1

Rubber seals-

3 to 6 years

1 set

*
*
*
Part No.: 4777 9343 10
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 sensor (ESR-A13i)
Part No.: 4777 9317 30
5-sheet set*

Battery-

Approx. 500
charging/discharging
cycles1

Name
Combustible gas
sensor (NCR-6309)
O2 sensor (ESR-X13P)
CO/H2S sensor(ESR-A1DP)
CO sensor (ESR-A13P)
CO sensor (ESR-A1CP)H2S sensor (ESR-A13i)
Dust filter

1Remarks** 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.

75 / 91

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

2

Loosen the two screws on theunderside of the main unit and release
the two tabs.
Detach the sensor cap and replace thedust filter with a new one.

ScrewsSensor cap

Dust filter
Tabs

3

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

4

Tighten the screws to secure thesensor cap.

76 / 91

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 interference gas removal filters, follow the procedure described in“Filter replacement”, tighten the screws securely, and make sure that the two tabs on the filter cap
are securely 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 minuteparticles 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 (GX-3R). Use of non-approved parts may adversely affect gas detection
performance and allow water to get inside the product.

<Interference gas removal filter replacement>12

3

Loosen the two screws
on the underside of themain unit and release thetwo tabs.
Remove the sensor cap,
dust filter, andinterference gas removal
filters in sequence, andreplace the interferencegas removal filters.

ScrewsSensor cap

Dust filter
Tabs
Intereference gas
removal filter
Interference gas
removal filter

Reseat the dust filter in
its original position.

4

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

5

Tighten the screws tosecure the sensor cap.

SensorSensor coverSensorSensor77 / 91

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 “Interference gas removal filter replacement”, tighten the screws securely, and makesure that the two tabs on the sensor cap are securely engaged. If the screws are loose or the tabsof 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 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 (GX-3R). Use of non-approved parts may adversely affect gas detection
performance and allow water to get inside the product.
• Use only the dedicated interference gas removal filter for each sensor. Otherwise gas may not be
detected correctly.

78 / 9188

Storage 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.

NOTE• If the product is not to be used for extended periods, we recommend storing after the battery isdischarged until the battery level icon shows one bar. Storing while fully charged may reduce
battery life and accelerate battery deterioration.

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 gas 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.

79 / 91

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 batteries inaccordance with procedures specified by local authorities.

<Disposal in EU member states>
When disposing of the product in an EU member state, separate the battery as specified.
The battery removed from the lithium ion battery unit must be handled in accordance with waste sortingand 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.

80 / 919
9TroubleshootingThis 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 battery is depleted.

Charge the battery in a safe place at ambient
temperatures between 0 °C and +40 °C.

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

To turn on the power, press the POWER button
until the buzzer blips, and then release the button.

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 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 power cannot
be turned on.

Air calibration is notpossible.
<FAIL SENSOR>

Bump testing is notpossible.

81 / 91

Span adjustment is
not possible.
<FAIL SENSOR>

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.

Symptoms<Screen display>
A sensorabnormality is
indicated inmeasurement
mode.
<FAIL SENSOR>
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. 081

PCB abnormality

Error No. 082

Temperature sensor
abnormality

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

Cause

ActionThe sensor sensitivity has
degraded.

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. 58)
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.

82 / 91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.

Slow response

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.
They may be a very small leakage (slow leakage)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.

83 / 9110
10

Product Specifications

10-1. Specifications list
<Common specifications>Concentration
display

LCD digital (7 segments + 14 segments + icons)

Detection method

Diffusion type

Displays

Clock, battery level, operation status

Buzzer volume

Approx. 95 dB (mean value at 30 cm)

Gas alarm
indication

Lamp flashing, continuous modulating buzzer sounding, gas concentration
display blinking, vibration

Gas alarm pattern

Self-latching

Fault alarm/self
diagnosis

System abnormality, sensor abnormality, battery voltage drop, calibration failure

Fault alarmindication

Lamp flashing, intermittent buzzer sounding, detail display

Fault alarm pattern

Self-latchingTransmission
specifications

IrDA (for data logger)

Power source

Lithium ion battery

Continuous
operating time

Approx. 40 hours (long-life battery mode ON, 25 °C, no alarm, no lighting)Approx. 25 hours (long-life battery mode OFF, 25 °C, no alarm, no lighting)Operatingtemperature range

Temporary use environment: -40 °C to +60 °C (no sudden changes)
Continuous use environment: -20 °C to +50 °C (no sudden changes)

Operating humidity
range

Temporary use environment: 0 %RH to 95 %RH (no condensation)
Continuous use environment: 10 %RH to 90 %RH (no condensation)

Operating pressure
range

80 kPa to 120 kPa (80 kPa to 110 kPa for explosion-proof range)

Construction
Explosion-proof
construction

Dustproof, splash-proof construction equivalent to IP66/68 (2 m, 1 h);
drop resistant to 7 m
ATEX/IECEx specification:
Intrinsically safe explosion-proof construction and flame-proof enclosures

84 / 91

Explosion-proof
class

ATEX
II 1 G Ex da ia IIC T4 Ga / I M1 Ex da ia I Ma ( With combustible gas sensor)
II 1 G Ex ia IIC T4 Ga / I M1 Ex ia I Ma ( No combustible gas sensor)
IECEx
Ex da ia IIC T4 Ga / Ex da ia I Ma ( With combustible gas sensor)
Ex ia IIC T4 Ga / Ex ia I Ma ( No combustible gas sensor)

External
dimensions

Approx. 58 mm (W) × 65 mm (H) × 26 mm (D) (excluding projections)

WeightApproximately 100 g

85 / 91

<Individual sensor specifications>Combustible gas
Isobutane (i-C4H10)*
Methane (CH4)*
NCR-6309
Sensor model
0 to 100 %LEL (1.3 vol%)0 to 100 %LEL (4.4 vol%)Detection range
1 %LEL
1 digit
1st alarm: 10 %LEL
2nd alarm: 25 %LEL
Alarm setpoint(ATEX/IECEx specification)
3rd alarm: 50 %LEL
OVER alarm: 100 %LEL
New ceramic type
Detection principle* The factory default setting is either CH4 or HC (specified in the order).
Item

Detection
target gas

Item

Detection
target gas

Sensor model
Measuring range(ATEX/IECEx specification)

Service range(ATEX/IECEx specification)

1 digit

Alarm setpoint(ATEX/IECEx specification)

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

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 %L: 19.5 %LL: 18.0 %H: 23.5 %OVER alarm: 40.0 %1 ppm
1st：25 ppm
2nd：50 ppm
3rd：1200 ppm
TWAalarm：25 ppm
STELalarm：200 ppm
OVERalarm：2000 ppm
Electrochemical type

0.1 ppm
1st：5.0 ppm
2nd：30.0 ppm
3rd：100.0 ppm
TWAalarm：1.0 ppm
STELalarm：5.0 ppm
OVERalarm：200.0 ppm

Carbon monoxide(CO)

Carbon monoxide(CO)*Hydrogen sulfide(H2S）

ESR-A13P

ESR-A1CPESR-A13i

0 to 500 ppm

0 to 500 ppm

0 to 100.0 ppm

501 to 2,000 ppm

501 to 2,000 ppm

100.1 to 200.0 ppm

Detection principle

Item

Detection
target gas

Sensor model
Measuring range(ATEX/IECEx specification)

Service range(ATEX/IECEx specification)

Hydrogen sulfide
(H2S）

1 ppm
0.1 ppm
1st：5.0 ppm
1st：25 ppm
2nd：30.0 ppm
2nd：50 ppm
3rd：100.0 ppm
3rd：1200 ppm
Alarm setpoint(ATEX/IECEx specification)
TWAalarm：1.0 ppm
TWAalarm：25 ppm
STELalarm：5.0 ppm
STELalarm：200 ppm
OVERalarm：2000 ppm OVERalarm：200.0 ppm
Electrochemical type
Detection principle*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.)
1 digit

1 ppm
1st：25 ppm
2nd：50 ppm
3rd：1200 ppm
TWAalarm：25 ppm
STELalarm：200 ppm
OVERalarm：2000 ppm

86 / 9110-2. Accessory list
Standard accessories (ATEX/IECEx specification)
Part nameHand strap
Belt clip (with attachment screw)
Rubber protection cover
AC adapter
EU plugCalibration adapter (simple type)Part number
0888 0605 90
4777 9202 40
4777 4161 102594 0898 30
2594 0933 60
4777 9369 30<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) 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 float)
Manual suction kit (with weighted 30 m tube)
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 9343 104777 9296 50
4777 4257 00
4777 4259 40
4777 9302 80
4777 9304 20
4777 9305 00
2594 0932 90
2594 0933 60
2594 0934 30
4777 9369 30
4777 9311 00
BC-3R 00
4777 4337 50
4777 9329 704777 9319 80
4777 9333 20
9811 0870 60

87 / 91

11

Appendix

11

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 separately) 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, maximum value, and maximum 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 before reaching
3,600.
The maximum recording times corresponding to different intervals are as follows:
Interval
Maximum
recording time

10 seconds

20 seconds

30 seconds

1 minute

3 minutes

5 minutes

10 minutes

10 hours

20 hours

30 hours

60 hours

180 hours

300 hours

600 hours* The standard interval is 5 minutes.
The interval can be set using the Data Logger Management Program (sold separately).

(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.

88 / 91

(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.

89 / 91

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

23000 ppm

23000 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.

90 / 91

15,000 ppm

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, beginning on the date of shipment to the buyer.
This warranty extends only to the sale of new and unused products to the original 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.
RIKEN SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR BASED ON
CONTRACT, TORT OR 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 ofcompetent jurisdiction, 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

91 / 91

Revision or Abolition History
Edition

RevisionIssue date

0First issue2021/4/6

1

Update Declaration of Conforminty

2021/10/29

2

Error correction

2021/12/7

3
4
5

4-1 note added, 6-2-2 reading list added, 6-4-4 bump expiration dateselection changed, 6-4-5 alarm point setting lower limit changed, note
added
1-2 Intended use TYPE P added,7-2-7Change of the lower limit of thesettable range of calibration gas concentration
6-4-3 Calibration expiration date interval changed

2022/3/15
2022/5/25
2022/6/2

Notes about the combustible gas conversion function and long-ife battery
added, DoC updated
P.5 / 30 / 86 Note about ESR-A1CP added, Part number for Data logger
management program corrected
1-4 UKCA marking added, 2-4 applicable standards added, UKCA DoC
added

2023/6/28

9

UKEX and UKCA deleted, DoC updated

2024/1/10

10

2-4 specific conditions of use added, DoC updated

2024/5/31

6
7
82022/8/2

2023/9/11