PT0E-2101

Portable Gas Detector
GX-Force
Operating Manual(PT0-210)

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

Contents
1 Product Overview ........................................................................................................................................... 4
1-1 Introduction ............................................................................................................................................... 4
1-2 Intended use ............................................................................................................................................. 5
1-3 Checking the detection target gases and product type............................................................................ 5
1-4 DANGER, WARNING, CAUTION, and NOTE ......................................................................................... 6
1-5 Checking standards and explosion-proof specifications .......................................................................... 7
2 Important Safety Information .......................................................................................................................... 8
2-1 Danger information ................................................................................................................................... 8
2-2 Warnings ................................................................................................................................................... 9
2-3 Precautions .............................................................................................................................................10
2-4 Safety information...................................................................................................................................12
3 Product Configuration ................................................................................................................................... 15
3-1 Main unit and accessories ......................................................................................................................15
3-1-1 Main unit ......................................................................................................................................... 15
3-1-2 Accessories ..................................................................................................................................... 16
3-1-3 Optional accessories ...................................................................................................................... 16
3-2 Part names and functions .......................................................................................................................18
3-2-1 Main unit ......................................................................................................................................... 18
3-2-2 LCD display .................................................................................................................................... 20
4 Alarm Activation ............................................................................................................................................ 21
4-1 Gas alarm types .....................................................................................................................................21
4-2 Gas alarm setpoints................................................................................................................................21
4-3 Gas alarm patterns .................................................................................................................................22
4-4 Fault alarm patterns................................................................................................................................24
5 Usage Instructions ........................................................................................................................................ 25
5-1 Usage note .............................................................................................................................................25
5-2 Preparations for startup ..........................................................................................................................25
5-2-1 Charging the lithium ion battery ...................................................................................................... 26
5-3 Startup procedure ...................................................................................................................................28
5-3-1 Turning on the power ...................................................................................................................... 28
5-3-2 Screen transition from powering on to measurement mode .......................................................... 29
5-4 Fresh air adjustment ...............................................................................................................................32
5-5 Gas detection..........................................................................................................................................33
5-5-1 Basic operating flow ....................................................................................................................... 34
5-5-2 Measurement mode ........................................................................................................................ 35
5-5-3 Snap log recording ......................................................................................................................... 37
5-6 Turning off the power ..............................................................................................................................38
6 Setting Procedure ......................................................................................................................................... 39
6-1 Display mode ..........................................................................................................................................39
6-1-1 Switching to display mode .............................................................................................................. 39
6-1-2 Contents displayed in display mode ............................................................................................... 40
6-2 Display mode settings ............................................................................................................................42
6-2-1 Light on/off ...................................................................................................................................... 42
6-2-2 Clearing PEAK value display .......................................................................................................... 42
6-2-3 Combustible gas conversion setting .............................................................................................. 43
6-2-4 Adjustment data display.................................................................................................................. 46
6-2-5 Bump test data display ................................................................................................................... 47
6-2-6 Snap log data display ..................................................................................................................... 48
6-2-7 Alarm setpoint display ..................................................................................................................... 49
6-3 User mode ..............................................................................................................................................50
6-3-1 Switching to user mode .................................................................................................................. 50
6-3-2 User mode setting items ................................................................................................................. 51
6-4 User mode settings .................................................................................................................................53
6-4-1 Bump test ........................................................................................................................................ 53
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Contents

6-4-2 Gas adjustment............................................................................................................................... 53
6-4-3 Adjustment expiration setting ......................................................................................................... 53
6-4-4 Bump test setting ............................................................................................................................ 57
6-4-5 Alarm setpoint setting ..................................................................................................................... 65
6-4-6 Lunch break on/off .......................................................................................................................... 68
6-4-7 Confirmation beep setting............................................................................................................... 69
6-4-8 LCD lighting time setting................................................................................................................. 72
6-4-9 Key operation tone on/off ............................................................................................................... 72
6-4-10 Display mode item display on/off .................................................................................................. 73
6-4-11 Zero suppression on/off ................................................................................................................ 74
6-4-12 Zero follower on/off ....................................................................................................................... 75
6-4-13 Date and time setting .................................................................................................................... 76
6-4-14 Password setting .......................................................................................................................... 76
6-4-15 ROM/SUM display ........................................................................................................................ 77
7 Maintenance ................................................................................................................................................. 78
7-1 Maintenance intervals and items ............................................................................................................78
7-1-1 Maintenance service ....................................................................................................................... 79
7-2 Gas adjustment ......................................................................................................................................80
7-2-1 Preparation for gas adjustment ...................................................................................................... 80
7-2-2 Gas adjustment setting ................................................................................................................... 82
7-2-3 Fresh air adjustment ....................................................................................................................... 84
7-2-4 AUTO adjustment ........................................................................................................................... 85
7-2-5 AUTO adjustment setting ................................................................................................................ 88
7-3 Bump test................................................................................................................................................91
7-3-1 Performing bump test ..................................................................................................................... 91
7-4 Cleaning procedure ................................................................................................................................93
7-5 Parts replacement ..................................................................................................................................94
7-5-1 Periodic replacement parts ............................................................................................................. 94
7-5-2 Filter replacement ........................................................................................................................... 95
8 Storage and Disposal ................................................................................................................................... 97
8-1 Procedures for storage or when not in use for extended periods ..........................................................97
8-2 Procedures for use after storage ............................................................................................................97
8-3 Product disposal .....................................................................................................................................98
9 Troubleshooting ............................................................................................................................................ 99
9-1 Product abnormalities .............................................................................................................................99
9-2 Reading abnormalities ..........................................................................................................................102
10 Product Specifications .............................................................................................................................. 103
10-1 Specifications list ................................................................................................................................103
10-1-1 Common specifications .............................................................................................................. 103
10-1-2 Individual sensor specifications .................................................................................................. 105
10-2 Accessory list ......................................................................................................................................107
11 Appendix ................................................................................................................................................... 108
11-1 Data logger function............................................................................................................................10811-2 Methane gas sensitivity and response when using supplied or optional sampling probes ...............10911-3 100 %LEL = ppm conversion list ........................................................................................................ 110
11-4 Product warranty ................................................................................................................................. 111
11-5 Sensor warranty .................................................................................................................................. 111

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1 Product Overview

1-1 Introduction1

1

Product Overview

1-1 Introduction
Thank you for your purchase of the GX-Force Portable Gas Monitor (“the product” hereinafter).
Before using the product, confirm that this operating manual covers the model you purchased.
The product should be used only by fully-trained personnel.
The maintenance procedures described in this manual should be performed only by fully-trained
personnel. Any maintenance procedure not described in this manual must be performed by Riken Keiki or
our certified service engineers. Please contact Riken Keiki.
This manual describes how to use the product and provides product specifications. Make sure you haveread and fully 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 handy place so that you can refer to it at any time.
Refer to the corresponding optional product manual when using the following optional product:
 SW-GX-Force Data Logger Management Program Software Operating Manual (PT0E-214)
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.

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1 Product Overview

1-2 Intended use

1-2 Intended use
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 atmosphere and issues
an alarm when preset alarm concentrations are reached, thereby alerting users to the hazards of
explosion, gas poisoning, and oxygen deficiency.
The product can be equipped with up to three types of sensors to enable detection of up to four different
gas types with a single unit.

1-3 Checking the detection target gases and product type
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 type and detection target gas can be checked on the nameplate affixed to the side of the product.
The type is indicated by the suffix to the product model printed on the nameplate.
“H” (gas type is isobutane (HC)) or “M” (gas type is methane (CH4)) printed to the left of the QR code.

Product type

Example nameplate

2010
2018

Combustible gas sensor gas type・ Isobutane (HC): H
・ Methane (CH4): M

Side of the product<List of detection target gases (installed sensor models) by type>
Detection target gases (installed sensor models)
Combustible
CarbonHydrogenCarbonCarbonType
gas
Oxygenmonoxide/hydrogensulfidemonoxidemonoxidesulfideHC or CH4 (ESR-X13P)(ESR-A13i) (ESR-A13P) (ESR-A1CP)*(ESR-A1DP)(NCR-6309)
Type A〇〇〇
Type B〇〇〇
Type C〇〇〇Type CH〇〇〇
Type D〇〇* The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce hydrogen interference. Thisfunction 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 hydrogen interference and may indicate a higher carbon monoxide
concentration than actual.)

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1 Product Overview

1-4 DANGER, WARNING, CAUTION, and NOTE

1-4 DANGER, WARNING, CAUTION, and NOTEThis operating manual uses the following categories to indicate potential damage/hazards if the user
disregards the information provided and uses the product incorrectly:

DANGER

This indicates situations in which improper handling may result in fatal or
serious injury or significant property damage.

WARNING

This indicates situations in which improper handling may result in serious
injury or significant property damage.

CAUTION

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

Additionally, usage recommendations are indicated as follows:

NOTE

This indicates items that will be helpful to know when using the product.

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1 Product Overview

1-5 Checking standards and explosion-proof specifications

1-5 Checking standards and explosion-proof specifications
The product specifications will vary depending on the specific standards and explosion-proof certification.
Check the actual product specifications before use. For CE/UKCA marking models, refer to the‘Declaration of Conformity’ at the end of this operating manual.
Check the affixed nameplate for product specifications.

Typeexamination
certificate
marking

Ex marking
CE marking
UKCA marking

Typical nameplate for Japan EX specifications

Typical nameplate for ATEX/UKEX/IECEx
specifications

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2 Important Safety Information

2-1 Danger information

22

Important Safety
Information

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

2-1 Danger information
DANGER
Explosion-proofing Do not modify or alter the circuits or configuration.
 When measuring oxygen concentrations, measure only mixtures of air andcombustible gas or toxic gas.
Do not use the oxygen sensor to detect leaks of combustible or toxic gases.
 When using the product in hazardous areas, the following precautions must be
observed to safeguard against static electricity hazards:① Wear anti-static clothing and conductive shoes (anti-static work shoes).
② When using the product indoors, stand on a conductive work floor (with aleakage resistance of 10 MΩ or less).
Main unit The ratings are as follows:
Power supply battery pack (BP-Force):
3.6 V DC, 200 mAh
Battery charging contact allowable voltage: 6.0 V DC (with SELV power supply only)
Ambient temperature:-20 °C - +60 °C(Ambient temperature refers to the temperature range in which the explosion-proof performancecan be maintained. It does not refer to the temperature range in which product performance isguaranteed. For information on the operating temperature range, refer to ‘10-1 Specifications list’.)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.

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2 Important Safety Information

2-2 Warnings

2-2 Warnings
WARNING
If an abnormality occurs
 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. Contact with theelectrolyte inside the sensor may result in skin inflammation. Contact with eyes may result inblindness. Contact with clothing may result in discoloration or damage to the fabric.
If contact occurs, rinse the area immediately with plenty of water.
 Do not use any gas other than nitrogen as the balance gas when adjusting the oxygen sensor.
Fresh air adjustment in surrounding 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
 A gas alarm indicates an extreme hazard. The user must take appropriate action after taking
appropriate steps to ensure safety.
Battery level check Check battery levels 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, turnoff the power and promptly charge the battery in a safe place.
Miscellaneous Do not dispose of the product into fire.
 Do not attempt to wash the product, either in a washing machine or an ultrasonic cleaning machine.
 Do not block the buzzer sound opening. Doing so will muffle or silence the audible warning.
 There is a danger that oxygen-deficient air or other gases may be discharged from enclosed
locations. Never lean over or look inside openings.

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2 Important Safety Information

2-3 Precautions

2-3 Precautions
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 it may be splashed with oil, chemicals, or other liquids.
・ 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 gas inlet or buzzer
sound opening.
 The gas inlet and outlet are not waterproof. Take care to prevent water such as rainwater fromentering these parts. Failure to do so may prevent gas detection.
 If the product has been exposed to water or dirt, remove any remaining water and dirt, and adjustas specified to confirm that it operates correctly.
 Do not use the product in locations outside the operating temperature range.
・ The operating temperature range for the product is as follows. Avoid using the product attemperatures outside the operating range.
Continuous use environment: -20 °C - +50 °C
Temporary use environment: -40 °C - +60 °C
・ Fully charge the battery before using the product on the lower temperature side of thetemporary
use environment temperature range (-40 °C - -20 °C).
・ Avoid using for extended periods in locations exposed to direct sunlight.
・ Avoid storing the product inside parked vehicles in hot weather.
 To prevent condensation within the product, adhere to the operating humidity range and avoid use
under conditions in which condensation may form.
Condensation forming inside the product may cause clogging or gas adsorption, which may prevent
accurate gas detection. In addition to the usage environment, carefully monitor the temperature andhumidity of the sampling point to prevent condensation forming inside the product.
 Do not use walkie-talkies near the product.
・ Radio waves from walkie-talkies or other radio wave transmitting devices near the product may
affect readings. If walkie-talkies or other radio wave transmitting devices are used, these must be
used away from the product where they do not affect operation.
・ Avoid using the product close to devices that emit strong electromagnetic radiation (e.g., highfrequency or high voltage devices).
 Keep the product away from magnetic fields.
 Magnetic fields may cause the product to fail or malfunction. If the product does not operatecorrectly, use it away from magnetic fields.
 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-concentration sulfides, or high-concentration 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 productto suck in fresh air afterward. Confirm that the reading returns to normal and is stabilized.
 The combustible gas sensor (%LEL) in the product may cause readings to rise for gases like argon,carbon dioxide, and nitrogen.
 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 adjusting the oxygen sensor.
Otherwise, oxygen reading errors will increase, preventing accurate measurement.

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2 Important Safety Information

2-3 Precautions

CAUTIONBe 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.
 An abnormality alarm may be triggered if the product is subjected to strong impact. If this occurs,
turn the power off and then back on again, then perform a bump test to confirm that the productfunctions correctly before use.
 The impact resistance of the product is not a guarantee against damage or failure. Dropping the
product may affect readings. We recommend performing inspection including gas adjustment if it
has been dropped.
 Do not use the product while charging it.
 Do not prod the buzzer sound opening with sharp objects. Doing so may result in ingress of wateror 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.
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 fresh air adjustment under conditions of pressure, temperature, and humidity similar
to those in the operating environment and in fresh air.
 Wait for the reading to stabilize before performing fresh air adjustment.
 If there is a temperature difference of 15 °C or more between the storage and usage locations,allow the product to stand and acclimatize for about 10 minutes in an environment similar to theusage location before turning on the power and performing fresh air adjustment 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.
 Even if you do not intend to use the product for extended periods, turn the power on at least once
every six months to check that the pump operates normally and gas is sucked in (by running the
product for approximately three minutes). Grease inside the pump motor may solidify and prevent
operation if the product is not operated for extended periods.
 After a period of extended storage, be sure to perform gas adjustment before resuming use. For
information on readjustment including gas adjustment, please contact Riken Keiki.

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2 Important Safety Information

2-4 Safety information

2-4 Safety information
Observe the following points to ensure performance as an explosion-proof product:
Product overview
 The GX-Force can be equipped with up to three types of sensors to detect up to four different gas types.
 The GX-Force can be used to detect combustible gases (%LEL), oxygen (O2), hydrogen sulfide (H2S),
and carbon monoxide (CO).
 Measurement results are displayed on the LCD. Gas alarms are indicated by LEDs and the buzzer
based on the settings.
Power source The GX-Force is powered by an internal rechargeable lithium ion battery. (The rechargeable battery
cannot be replaced by the customer.) Charge the battery using the dedicated AC adapter, an IEC 60950 certified SELV power supply, or IEC
62368-1 certified ES1 power supply.
 Make sure that the maximum voltage from the charger does not exceed 6.0 V DC.

<Japan EX specifications>
Explosion-proof construction:

Intrinsically safe explosion-proof construction, flame-proof
enclosure
Explosion-proof class:
Ex da ia IIC Ta Ga
Ambient temperature*:-20 °C - +60 °C
Ambient temperature (when charging): +10 °C - +40 °C
Ratings:
Power supply: 3.6 V DC, 200 mA
Battery pack (BP-Force)
Battery charging contact allowable voltage: 6.0 V DC
Complies with the following guidelines: JNIOSH-TR-46-1:2020
JNIOSH-TR-46-2:2018* Ambient temperature refers to the temperature range in which the explosion-proof performance can be
maintained. It does not refer to the temperature range in which product performance is guaranteed.
For information on the operating temperature range, refer to ‘10-1 Specifications list’.

DANGER Charge the battery using the provided charger in a safe place.
 Charge the battery at ambient temperatures between +10 °C and +40 °C.

WARNING Do not modify or alter the circuits or configuration.
 Do not disassemble or modify the product.
 In this product, only the NCR-6309 combustible gas sensor has a flame-proof enclosure.
 This product is an explosion-proof product. Do not disassemble or modify any parts other thanthose specified.
(This includes the prohibition of repairs to flame-proof joints.)
 This product contains a sensor with a flame-proof enclosure. Explosion-proof performance may be
impaired if not assembled as specified. When replacing the filter, use the dedicated components
and mount correctly with the correct torque.
 If the housing becomes damaged, stop using the product and have it repaired.
 Do not use with the sensor exposed to ultraviolet light or insufficiently shaded.

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2 Important Safety Information

2-4 Safety information

 Do not charge in hazardous areas.
 Charge the battery using the dedicated AC adapter, an IEC 60950 certified SELV power supply, or
IEC 62368-1 certified ES1 power supply.
 When measuring oxygen concentrations, use the product only to detect leaks of mixtures of air andcombustible gas or toxic gas.
 When carrying and using the product in hazardous areas, the following general precautions must be
observed to safeguard against static electricity hazards:① Wear anti-static clothing and conductive shoes (anti-static work shoes).
② When using the product indoors, stand on a conductive work floor (with a leakage resistance of
10 MΩ or less).

<ATEX/UKEX/IECEx specifications>
Explosion-proof
construction

Intrinsically safe explosion-proof construction, flame-proof enclosure

Explosion-proofclass

Ex da ia IIC T4 Ga
II 1 G Ex da ia IIC T4 Ga

Ambient
temperature
Ambient
temperature(when charging)Electrical
specifications

Certificate
numbers
Applicablestandards-20 °C - +60 °C+10 °C - +40 °C
・ BP-Force is specified for the rechargeable lithium ion battery.
・ Uses one Panasonic NCR18650GA.
・ Charge the battery using the dedicated AC adapter, an IEC 60950 certified SELV
power supply, or IEC 62368-1 certified ES1 power supply.
Make sure that the maximum voltage from the charger does not exceed 6.0 V DC.
・ IECEx: IECEx DNV 22.0029X
・ ATEX: DNV 22 ATEX 05201X
・UK Type Examination Certificate: DNV 22 UKEX 55041X• IEC 60079-0:2017• EN IEC 60079-0:2018
・BS EN IEC 60079-0:2018• IEC 60079-1:2014-06 • EN 60079-1:2014
・BS EN 60079-1:2014• EN 60079-11:2012• IEC 60079-11:2011
・BS EN 60079-11:2012

WARNING Do not disassemble or modify the product.
 Only the NCR-6309 combustible gas sensor has a flame-proof construction in the product.
 The product is an explosion-proof device. Do not disassemble or modify components other thanthose stipulated.
 The product incorporates a flame-proof construction sensor. Explosion-proof performance may be
impaired if it has not been assembled as specified. When replacing the filter, mount the specified
parts using the correct torque.
 If the casing is damaged, stop using the product. Have it repaired before resuming use.
 Do not use the product with the sensors inadequately shielded or exposed to ultraviolet light.
 Do not charge in hazardous areas.
 Charge the battery using the dedicated AC adapter, an IEC 60950 certified SELV power supply, or
IEC 62368-1 certified ES1 power supply.

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2 Important Safety Information

Product code
INST. No.

2-4 Safety information

00

0

000

0000

00

A

B

C

D

E

A: Year of manufacture (0 - 9)
B: Month of manufacture (1 - 9 for Jan. - Sep.; XYZ for Oct., Nov., Dec.)
C: Manufacturing lot
D: Serial number
E: Factory code

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

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3 Product Configuration

3-1 Main unit and accessories

3

3

Product Configuration

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

3-1-1 Main unit
For detailed information on the names and functions of product parts and the LCD display, refer to ‘3-2
Part names and functions’.

GX-Force main unit

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3 Product Configuration

3-1 Main unit and accessories

3-1-2 Accessories<Japan EX specifications>
AC adapter
×1

Tapered nozzle
×1

Hand strap
×1

Product
warranty

Warranty

Operating
Manual< ATEX/UKEX/IECEx specifications>
Product warranty

Sensor warranty

Operating Manual

3-1-3 Optional accessories
AC adapter
×1

Tapered nozzle
×1

Hand strap
×1

Belt clip
×1

・ Includes two screws for attachment to therear of the main unit.

Gas sampling rod
Gas sampling tube
×1 each・ The gas sampling rod and gas samplingtube are used together.

Float-type gas collector
×1・ The tube is about 8 m long.

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3 Product Configuration

3-1 Main unit and accessories

Two-stage gas
sampling rod
×1

・ The sampling rod length is as follows:
Total length: Approx. 70 cm
Reduced length: Approx. 40 cm

USB cable
Type-A - Type-C
×1

・ For connecting to the PC when using thedata logger management program
・ The cable is 1 m long.

Data logger
management program
CD- ROM(SW-GX-Force)
×1
Various filters, etc.

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3 Product Configuration

3-2 Part names and functions

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

3-2-1 Main unit

(4)

(9)

(5)

(6)
(10)
(1)

(4)

(3)

(2)
(7)

(11)
(12)

(8)

Name

Main function(1)

LCD display

Displays the gas concentration and other information.

(2)

POWER/MODE button

Turns the power on and off.
Used to confirm settings when in display mode and user mode(3)

AIR button

Performs fresh air adjustment in measurement mode.
Used to select functions when in display mode and user mode

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3 Product Configuration

3-2 Part names and functions

Name

Main function(4)

Alarm LED arrays

Flashes in red when an alarm occurs.
The LEDs on the left and right also flash red if measurement is
not currently underway.

(5)

Light

Lights up when the light is turned on.

(6)

Filter caseContains a dust filter.
(Do not open except when inspecting or replacing the filter.)(7)

Buzzer sound opening

Emits operating and alarm sounds. (Do not block.)(8)

USB protective coverDetach the cover to connect the AC adapter when charging.
Connect a USB cable to connect to a PC.

(9)

Gas inlet

Connector for attaching tapered nozzle(10)

Gas outlet

Outlet for gas drawn in (Do not block.)(11)

Strap holes(two locations)

Holes for attaching the hand strap. There are two holes on eachside (left and right).

(12)Charging indicator lamp

Lights up in green when the charger is connected, and lights up inorange when charging starts.
Lights up in green once charging is completed.

CAUTION Do not prod the buzzer sound opening with sharp objects. Doing so may result in ingress of wateror 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 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 block the gas outlet or subject it to force.
 Before using the gas sampling rod and various gas sampling tubes, check to confirm that the tubes
are free of damage and provide appropriate flow rates.
 Use of the gas sampling rod and various gas sampling tubes will create a response delay of up to
three seconds per meter of flow length.

NOTE
 In this operating manual, the POWER/MODE button is described as follows:・ When turning power on/off: POWER button
MODE button
・ When confirming settings:

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3 Product Configuration

3-2 Part names and functions

3-2-2 LCD display
(2)
(1)

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

(3)

(4)

(5)

(6)

(7)

(8)

Name
Operating status icon
Clock display
Combustible gas
concentration
Oxygen concentration
Carbon monoxide
concentration
Hydrogen sulfide
concentration

Main function
Indicates the product operating status. Blinks when normal.
Displays the time.
Displays gas concentrations.
The concentration reading is updated every five seconds for
combustible gases.
The concentration reading is updated every second for gases otherthan combustible gases.

(7)

Battery level icon

Indicates battery levels.
See NOTE below for a guide to battery level indications.

(8)

Pump operating status
icon

Indicates suction status. Rotates when normal.

NOTE
 Approximate battery levels are indicated as follows:: Sufficient: Low: Needs charging
The battery level icon will blink if the battery level drops even further.
 If the bump test expiration display setting is enabled, [✔] is displayedin the upper left of the LCD until the bump test expiration date. For
information on the bump test expiration display setting, refer to ‘6-4-4
Bump test setting’.

 [M] is displayed in the upper left of the LCD when user mode isselected.

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4 Alarm Activation

4-1 Gas alarm types

4

4

Alarm Activation

4-1 Gas 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 < TWA alarm < STEL alarm

4-2 Gas alarm setpoints
The default settings for gas alarm setpoints are as shown in the following table:<Default settings>
Item

Targetgas

Combustible gas
HC or CH4

O2

CO

H2S

Display range(Resolution)

0 - 100 %LEL

0.0 - 40.0 %0 - 2,000 ppm

0.0 - 200.0 ppm

Detection
range(Japan EX
specifications)0 - 100 %LEL

0.0 - 25.0 %0 - 500 ppm

0.0 - 30.0 ppm

1 %LEL

0.1 %

1 ppm

0.1 ppm

1st alarm: 10 %LEL
L: 19.5 %Alarm
2nd alarm: 50 %LEL
LL: 18.0 %setpoints
3rd alarm: 50 %LEL
H: 25.0 %(Japan EX
OVER alarm: 100 %LEL OVER alarm: 40.0 %specifications)
MOVER alarm: -10 %LEL MOVER alarm: -1.0 %1st alarm: 25 ppm
2nd alarm: 50 ppm
3rd alarm: 50 ppm
TWA alarm: 25 ppm
STEL alarm: 200 ppm
OVER alarm: 2,000 ppm
MOVER alarm: -50 ppm

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

Alarm
1st alarm: 10 %LEL
L: 19.5 %setpoints
2nd alarm: 25 %LEL
LL: 18.0 %H: 23.5 %(ATEX/UKEX/ 3rd alarm: 50 %LEL
OVER
alarm:100%LEL
OVER alarm: 40.0 %IECEx
specifications) MOVER alarm: -10 %LEL MOVER alarm: -1.0 %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: -50 ppm

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: -10.0 ppm

Minimum
resolution

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4 Alarm Activation

4-3 Gas alarm patterns

NOTE The default settings for gas alarm setpoints are as shown in the table on the previous page.
 The alarm setpoints indicated for the first alarm (WARNING), second alarm (ALARM), third alarm(ALARM H), TWA and STEL alarm in the table on the previous page can be changed. For
information on how to change the alarm setpoints, refer to ‘6-4-5 Alarm setpoint setting’.
 The M OVER alarm (negative sensor failure) occurs when the zero point drifts to the negative side.

4-3 Gas alarm patterns<Gas alarm buzzer sounding and lamp flashing patterns>
When a gas alarm occurs, the user is notified by the buzzer sounding, the alarm LED array flashing, andvibration.
The individual operations are as follows:
Second
Third
STEL
OVER
M OVER
Alarm type First alarm
TWA alarm
alarm
alarm
alarm
alarm
alarm
Buzzersounding
Approx.
1-second
interval“Beep,
beep”
Alarm LEDarray
flashing
Vibration

Approx.
0.5-second
interval“Beep,
beep, beep,
beep”

Approx.
0.5-second
interval“Beep,
beep, beep,
beep”

Approx.
1-second
interval“Beep,
beep”

Approx.
1-second
interval“Beep,
beep”

Approx.
0.5-second
interval“Beep,
beep, beep,
beep”

Approx.
1-second
interval“Beep, beep”

Approx.
0.5-second
interval

Approx.
1-second
interval

Repeated flashing
Approx.
1-second
interval

Approx.
0.5-second
interval

Approx.
0.5-second
interval

Approx.
1-second
interval

Approx.
1-second
interval

Vibration when alarm occurs

For gases other than oxygen: Alarm pattern (H-HH-HHH): 1-second interval: 0.5-second interval

None

For oxygen: Alarm pattern (L-LL-H): 1-second interval: 0.5-second interval
Reset

Reset

0

Repeatedintermittent
beeps

Repeated alternating loud and soft beeps

0Time
Alarm lamp
BuzzerTime
Alarm lamp
BuzzerNOTE
 If the alarm silence function is enabled (the default setting), you can stop only the buzzer sound bypressing the MODE button when a gas alarm is triggered. The buzzer will sound once again if a
new gas alarm is triggered after you stop the first buzzer. This function can be enabled/disabled in
the optional data logger management program (SW-GX-Force).
 If the alarm silence function is disabled, the buzzer sound will not stop when a gas alarm istriggered.
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4 Alarm Activation

4-3 Gas alarm patterns<Gas alarm display>
If a gas alarm occurs, the alarm type is indicated at the bottom of the screen and the corresponding gas
concentration, gas name, and unit displays blink. If the detection range is exceeded (over scale), [OVER]
appears at the bottom of the screen and [∩∩∩] blinks in the gas concentration display area.

Display example: Methane (CH4) concentration: 10 %LEL first alarm triggered
Alarm
type

First alarm

LCD Gas
Display concentration
blinks.

Screendisplay:[WARNING]

Secondalarm

Third alarm

TWA alarm

STEL alarm

OVER alarm

M OVER
alarm

Gas
concentration
blinks.

Gas
concentration
blinks.

Gas
concentration
blinks.

Gas
concentration
blinks.

[∩∩∩] blinks
in gasconcentration
value display
area.

[UUU] blinks
in gasconcentration
value display
area.

Screendisplay:[ALARM]

Screendisplay:[ALARM H]

Screendisplay:[TWA]

Screendisplay:[STEL]

Screendisplay:[OVER]

Screendisplay:[M OVER]WARNING A gas alarm indicates the presence of extreme danger. The user must take appropriate action after
taking appropriate steps to ensure safety.

NOTE
 The alarm pattern can be checked using an alarm test in display mode. Note, however, that the gas
concentration value will not blink in alarm tests.

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4 Alarm Activation

4-4 Fault alarm patterns

4-4 Fault alarm patterns
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, sensor
abnormality, pump abnormality, and low flow rate 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

Pump abnormality

Low flow rate 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), refer to ‘9 Troubleshooting’.

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5 Usage Instructions

5-1 Usage note

5

5

Usage Instructions

5-1 Usage note
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 Preparations for startup
Check the following before starting gas detection: The type and specifications of the particular product being used Gas alarm setpoints
 Confirm that the filters are present inside the product and are not contaminated or clogged.
 Confirm that the battery level is sufficient.
 Confirm that the pump is operating normally. (Check that a low flow rate alarm occurs when the gas
inlet is blocked with a finger.)

NOTE For information on the product type and specifications, refer to ‘1-3 Checking the detection target
gases and product type’ and ‘1-5 Checking standards and explosion-proof specifications’.
 For information on the product gas alarm setpoint default settings, refer to ‘4-2 Gas alarm
setpoints’.
 For information on the low flow rate alarm and how to reset it, refer to ‘4-4 Fault alarm patterns’.
 If the settings for the product have been altered from an external device, be sure to confirm that thesettings have been altered correctly.
 Protective film is attached to the LCD display on the product to protect it against scratching during
shipping.
Be sure to peel off this protective film before using the product. Explosion-proofing cannot be
guaranteed if the protective film is left attached.

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5 Usage Instructions

5-2 Preparations for startup

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

DANGER Charge in a location free of hazards.
 Charge the battery using the dedicated AC adapter, an IEC 60950 certified SELV power supply, or
IEC 62368-1 certified ES1 power supply.
 Charge the battery at ambient temperatures between +10 °C and +40 °C.

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.
 Using a charger other than the dedicated charger may result in slow charging or other charging
problems.

<Charging the lithium ion battery>
1

Open the USB protective cover on the
product.

2

Insert the charger plug into the USB
Type-C connector of the main unit.

USB protective
cover

Plug

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5 Usage Instructions3

5-2 Preparations for startup

Plug the charger into the outlet.
When the charger is connected, the charging
indicator lamp lights up in green. Whencharging starts, the lamp lights up in orange.
(Full charge requires about 10 hours at
maximum.)
Once charging is completed, the charging
indicator lamp lights up in green.

Charging indicatorlamp

4

When charging is complete, unplug the charger
from the outlet and close the USB protective
cover.
Press the USB protective cover securely into place.

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5 Usage Instructions

5-3 Startup procedure

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

5-3-1 Turning on the power1

Hold down the POWER button (for at least
three seconds) until the buzzer blips.
The power turns on.

The entire LCD display lights up.

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

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5 Usage Instructions

5-3 Startup procedure

5-3-2 Screen transition from powering on to measurement mode
When the power is turned on, the LCD display changes automatically as shown below, then the productswitches to measurement mode.
<Display examples: Default settings> (Approx. 40 seconds)

Maintenance notification
display screen* Displayed with Japan EX
specifications only

Gas adjustment expiration
display screen* Displayed with
ATEX/UKEX/IECEx
specifications only

Date and time display

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 mode
The buzzer blips twice andthe product switches tomeasurement mode.

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5 Usage Instructions

5-3 Startup procedure

CAUTION With ATEX/UKEX/IECEx specifications, notification is given when the power is turned on if the set
adjustment expiration date has passed. The behavior differs depending on the settings.
For information on the AUTO adjustment cylinder settings, refer to ‘7-2 Gas adjustment’.
If you perform adjustment, perform after waiting at least 45 seconds after the power has been
turned on.
[CONFIRM]: Triggers a fault alarm. Press the MODE button to proceed to AUTO adjustment
cylinder settings.
[CANT.USE]: Triggers a fault alarm. Press the MODE button or wait six seconds to automaticallyproceed to AUTO adjustment cylinder settings.
[NONE]:
Notifies that adjustment has expired. Press the MODE button to proceed to AUTO
adjustment cylinder settings. If no button is pressed for six seconds, the productautomatically switches to measurement mode.
 If the set bump test expiration date has passed, notification is given when the power is turned on.
The behavior differs depending on the settings.
For information on the bump test cylinder settings, refer to ‘7-3 Bump test’.
[CONFIRM]: Triggers a fault alarm. Press the MODE button to proceed to bump test cylinder
settings.
[CANT.USE]: Triggers a fault alarm. Press the MODE button or wait six seconds to automaticallyproceed to bump test cylinder settings.
[NONE]:
Notifies that the bump test has expired. Press the MODE button to proceed tobump test cylinder settings. If no button is pressed for six seconds, the productautomatically switches to measurement mode.
 With models that detect combustible gases, the screen shown on
the right may be displayed with the buzzer sounding and LED
flashing after the battery level and alarm pattern are displayed.
If this screen is displayed, some combustible gases cannot be
converted using the combustible gas conversion function. For
information on the types of gases that cannot be converted, refer to‘6-2-3 Combustible gas conversion setting’.
If the screen shown on the right appears, the alarm can be temporarily reset by pressing the MODE
button (or after five seconds if no buttons are pressed).
Note that the screen shown on the right appears when the combustible gas sensor is placed under the
poisoning effects of silicone compounds or halides. If the screen shown on the right is displayed, theconversion function can be used only for those gas types marked “〇” in the “Conversion whenconversion is restricted” column. To continue to use the conversion function for gas types marked “×”,contact Riken Keiki.
 If a gas that cannot be converted has been set, the setting will automatically return to thecalibration gas.
 If any abnormality is detected in the sensor, [FAIL] appears in place of the measured value justbefore the product switches to measurement mode, and a sensor abnormality alarm is triggered. If
this occurs, press the MODE button to temporarily reset the sensor abnormality alarm. However,
the alarm 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 fresh air adjustment before starting gas detection. (Refer to ‘5-4 Fresh air
adjustment’.)

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5 Usage Instructions

5-3 Startup procedure

NOTE If an abnormality arises in the built-in clock, a fault alarm ([FAIL CLOCK]) 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. 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 display setting is enabled, the number of days remaining after thelast bump test date until a specified setting date is displayed when the power is turned on. For
information on the bump test expiration setting, refer to ‘6-4-4 Bump test setting’.
Maintenance notification display<Japan EX specifications>
The number of days up to one year (365 days) remaining after the last adjustment date isdisplayed. The buzzer sounds if more than one year has elapsed since the last adjustment date.
To cancel the buzzer, press the AIR button.
<ATEX/UKEX/IECEx specifications>
The number of days remaining after the last adjustment date until a specified setting date isdisplayed. For information on the adjustment expiration setting, refer to ‘6-4-3 Adjustment
expiration setting’.
Date and time
Displays the date and time. You can set the date and time following the instructions in ‘6-4-13 Dateand time setting’.
If a USB connection is detected while the time and date is displayed, the product switches tocommunication mode. The product also switches to communication mode if you press the AIR and
MODE buttons at the same time.
Battery level/alarm pattern
The battery level (voltage) and alarm pattern setting ([AL-L] (self-latching)) is displayed on thescreen.
If a USB connection is detected while the battery level and alarm pattern is displayed, the productswitches to communication mode. The product also switches to communication mode if you press
the AIR and MODE buttons at the same time.
Detection target gas name
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.
First alarm setpoint
Displays the first alarm setpoint for the detection target gas.
Second alarm setpoint
Displays the second alarm setpoint for the detection target gas.
Third alarm setpoint
Displays the third alarm setpoint for the detection target gas.
STEL alarm setpoint ([TWA] and [STEL] are displayed only 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 40hour workweek to which almost all users may be repeatedly exposed without adverse health effect.

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5 Usage Instructions

5-4 Fresh air adjustment

5-4 Fresh air adjustment
Fresh air adjustment refers to zero adjustment required to ensure accurate measurement of gas
concentrations.

WARNING 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 perform fresh air
adjustment correctly and potentially result in hazardous conditions in the event of actual gas leaks.

CAUTION After startup, perform fresh air adjustment before starting gas detection.
 Always perform fresh air adjustment under conditions of pressure, temperature, and humidity
similar to those in the operating environment and in fresh air.
 Wait for the reading to stabilize before performing fresh air adjustment.
 If there is a temperature difference of 15 °C or more between the storage and usage locations,allow the product to stand and acclimatize for about 10 minutes in an environment similar to theusage location before turning on the power and performing fresh air adjustment in fresh air.

1

Hold down the AIR button in measurement mode.

The fresh air adjustment screen is displayed.
Keep the AIR button pressed for as long as the screen
shown on the right is displayed.
Fresh air adjustment will not be performed if you release thebutton before the screen is displayed or while it is displayed.

2

Release the AIR button once the screen shown on the rightappears.

The product automatically returns to measurement mode once
fresh air adjustment has been successfully completed.

NOTE If fresh air adjustment fails, [FAIL] appears in the concentration display area for the corresponding
sensor. Press the MODE button to reset the fault alarm (adjustment failure). Resetting the alarm
displays the value before adjustment.
For more information on resetting this fault, refer to ‘9 Troubleshooting’.

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5 Usage Instructions

5-5 Gas detection

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

WARNING When 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 perform adjustment
correctly and potentially result in hazardous conditions in the event of actual gas leaks.
 A gas alarm indicates the presence of extreme danger. The user must take appropriate action
based on the situation.
 If the battery voltage drops, gas cannot be detected. If a low battery voltage alarm occurs duringuse, turn off the power and promptly charge the battery in a safe place.
 Do not block the buzzer sound opening. Doing so will muffle or silence the audible warning.

CAUTION Check the settings before starting gas detection.
 Readings close to the zero level are subject to processing to minimize fluctuations.

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5 Usage Instructions

5-5 Gas detection

5-5-1 Basic operating flow
Turn on the power to proceed to the measurement mode screen.
<Snap log record><Fresh air adjustment><Display mode>

Hold
down

Hold
down

+
<Measurement mode><Gas alarm state><Fault alarm state>(Self-latching)Reset after recovery to normal state(Self-latching)Reset after turning off power

Measuredvalue
blinking

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5 Usage Instructions

5-5 Gas detection

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-concentration sulfides, or high-concentration 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. Allow the product tostand in fresh air after use, and 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 adjusting the oxygen sensor.
Otherwise, oxygen reading errors will increase, preventing accurate measurement.
 If the product is exposed to highly adsorptive gas, allow the product to suck in fresh air, andconfirm that the reading returns to zero before use.
 The hydrogen sulfide (H2S) sensor may exhibit temporary fluctuations if exposed to sudden
temperature and humidity variations. Allow the product to stand and acclimatize in the ambient
atmosphere.
 The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce interference
due to hydrogen. This function works for hydrogen concentrations up to 2,000 ppm. However, if
used in an environment exceeding 40°C for more than 15 minutes, it may be affected by hydrogeninterference and may indicate a higher carbon monoxide concentration than actual.
 If the carbon monoxide sensor (ESR-A1CP) detects hydrogen at a concentration of 2,000 ppm or
higher, [H2] and [rich] are displayed alternately in the concentration display area. Whilemeasurement can continue, errors will arise with carbon monoxide concentration readings due tothe significant effects of hydrogen interference.

Concentration display: [rich]Concentration display: [H2]35 / 111

5 Usage Instructions

5-5 Gas detection

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 suck in fresh air. Perform air cleaning until the reading returns to around zero
to remove any adsorbed gas. Performing fresh air adjustment before a complete cleaning may
prevent accurate adjustment, 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 fresh air adjustment in the ambient atmosphere.
 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 suck 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 suck in fresh air and perform air cleaning.
 A temperature range error will occur if measurement outside the operating temperature range
continues for more than 20 minutes. When a temperature range error occurs, either leave theproduct for five minutes or longer in the operating temperature range, or turn off the power of themain unit.

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5 Usage Instructions

5-5 Gas detection

5-5-3 Snap log recording
Instantaneous concentration values can be recorded for user-specified gases while measurement is inprogress.
Up to 256 items can be recorded in the snap log. When the maximum number of items is reached, theoldest data is overwritten by new data.
1

Hold down the AIR button and MODE button at the same time in measurement mode.
The memory number, station ID, date and time, and instantaneous value are displayed in sequence.

2

Press the MODE button.
The instantaneous gas concentration is stored together with the date and time at which the MODE
button was pressed.
[SAVED] is displayed and the display returns to the screen in Step 1.

NOTE
 To continue snap log recording, repeat the procedure in Step 2.
 To stop or exit snap log recording, press the AIR button in Step 2. Pressing the AIR button returns
the product to measurement mode.
 The recorded data can be checked on the REC.DATA screen in display mode. (Refer to ‘6-2-6Snap log data display’.)

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5 Usage Instructions

5-6 Turning off the power

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

1

Hold down the POWER button.
To turn off the power, wait for the display to return to zero(or 20.9% for the oxygen concentration display) in alocation free of hazardous gases, then hold down the
POWER button.

The buzzer blips three times and [TURN OFF] appearson 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.
 If the display has not returned to zero when you turn off the power,
purging will be performed for up to 30 seconds to clean the productinterior.
The screen as shown on the right is displayed while purging is inprogress.

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 or commerciallyavailable cleaners.

38 / 111

6 Setting Procedure

6-1 Display mode

6

6

Setting Procedure

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

6-1-1 Switching to display mode1

Press the MODE button in measurement mode.

Pressing the MODE button displays the various setting item
screens in sequence.

2

Once the settings are complete, press the MODE button
in display mode several times.
The product returns to measurement mode.

NOTE If no button is pressed for about 20 seconds, the product will return to measurement mode.
 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 product returns to display mode.

39 / 111

6 Setting Procedure

6-1 Display mode

6-1-2 Contents displayed in display mode
Setting item
(Screen notation)

Display contents

LCD display

Reference

Light on/off([LIGHT])

Turns the light on and off.

‘6-2-1 Light on/off’

PEAK value display([PEAK])

Displays the maximum gas
concentration (or minimum
oxygen concentration)
detected since the power was
turned on.

‘6-2-2 Clearing
PEAK value
display’

STEL value display([STEL])* Displays only CO andH2S.

TWA value display([TWA])* Displays only CO and
H2S.

Displays the STEL value fromthe present to 15 minutes ago(or when the power was
switched on).
The STEL value refers to thesum of 15 pieces of averagevalue data for measured
values over a period of 60
seconds divided by 15.
The value is refreshed every
60 seconds.
Displays the TWA value fromthe present to 8 hours ago (orwhen the power was switchedon).
The TWA value refers to thevalue obtained by calculating
the average for measured
values over a period of 60
seconds and then dividing thetotal calculated for a period of 8hours by 480.
The value is refreshed every
60 seconds.

-----

-----

Combustible gas
conversion setting([HC GAS])* Displayed only onmodels that detect
combustible gases

Selects the gas to beconverted from the list of gases
preregistered in the product.

‘6-2-3
Combustible gas
conversion
setting’

Adjustment data display([CAL.DATA])* Displayed with
ATEX/UKEX/IECEx
specifications only

Displays the adjusted gas typeand adjustment date.

‘6-2-4 Adjustment
data display’

Bump test data display([BMP.DATA])

Displays the bump test gas
type and the test date.

‘6-2-5 Bump test
data display’

40 / 111

6 Setting Procedure

6-1 Display mode

Setting item
(Screen notation)

Display contents

Snap log data display([REC.DATA])

Displays the recorded gas
concentration.

‘6-2-6 Snap log
data display’

Date and time andtemperature display([DATE])

Displays the date, time, andtemperature.

-----

Alarm setpoint display([ALARM-P])

Displays various alarm
setpoints.

LCD display

Reference‘6-2-7 Alarm
setpoint display’

NOTE The previously measured PEAK and TWA values retained the last time the power was turned off
are displayed when the lunch break function is enabled.
 Combustible gas conversion setting ([HC GAS]) is not displayed for calibration gas types otherthan CH4 or i-C4H10.
 Bump test data is displayed if the bump test expiration display setting is enabled in user mode.
 Adjustment data is displayed if the adjustment expiration display setting 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.

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6 Setting Procedure

6-2 Display mode settings

6-2 Display mode settings
You can check and change settings by switching from measurement mode to display mode.

6-2-1 Light on/off
Turns the light on and off.
The light will go out automatically approximately two minutes after it is turned on.
1

Press the MODE button in measurement mode to display the
LIGHT screen.

2

Press the AIR button to turn the light on or off.
Pressing the AIR button lets you select [On] or [OFF] for the light.
The default setting is [OFF].

3

Press the MODE button.
The light is set on or off and the PEAK screen is displayed.

6-2-2 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 several times in measurement mode
to display the PEAK screen.

2

Hold down the AIR button.

3

Release the AIR button once [RELEASE] is displayed on thescreen.

The PEAK value is cleared and the display returns to the screen in
Step 1.

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6 Setting Procedure

6-2 Display mode settings

6-2-3 Combustible gas conversion setting
Combustible gas measurements can be displayed as a concentration of a gas preregistered in the
product.
The following combustible gases can be converted:<Combustible gas conversion list>
Gas name
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
Tetrahydrofuran
Normal pentane

Gas name
displayCH4
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-C5H1243 / 111

Calibration gas
conversion
CH4

i-C4H10

〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇

×
〇
〇
〇
〇
×
〇
〇
〇
×
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇
〇

Conversion
whenconversion
is restricted
〇
〇
〇
×
〇
〇
〇
×
〇
×
〇
〇
〇
×
〇
×
〇
×
×
×
×
×
×
×
×
×
〇

6 Setting Procedure

6-2 Display mode settings

CAUTION On models that detect combustible gases, the screen shown on theright may be displayed with the buzzer sounding and LED flashingafter the power is turned on or gas adjustment is performed. If thisscreen is displayed, some combustible gases cannot be converted
using the combustible gas conversion function. For information on thetypes of gases that cannot be converted, refer to ‘<Combustible gas
conversion list>’ shown above.
If the screen shown on the right appears, the alarm can be temporarily reset by pressing the
MODE button (or after five seconds if no buttons are pressed).
Note that the screen shown on the right appears when the combustible gas sensor is placed under
the poisoning effects of silicone compounds or halides. If the screen shown on the right isdisplayed, the conversion function can be used only for those gas types marked “〇” in the“Conversion when conversion is restricted” column. To continue to use the conversion function forgas types marked “×”, contact Riken Keiki.

NOTE Combustible gas conversion selection is displayed for CH4 and i-C4H10.
 This does not appear if display mode item display in user mode is disabled. (Refer to ‘6-4-10
Display mode item display on/off’.)
The default settings are as follows:・ Japan EX specifications: Display mode item display: [OFF]・ ATEX/UKEX/IECEx specifications: Display mode item display: [On]
 To cancel before finalizing changes to the settings, hold down the AIR button and MODE button at
the same time. The product 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 gas conversion isset, the reading accuracy for the product will not be achieved.
 For information on the list of gases that can be converted, refer to ‘<Combustible gas conversion
list>’.
 The product specifications vary depending on the combustible gas detected. Depending on the
product specifications, certain gas types may not be converted. Refer to ‘<Combustible gas
conversion list>’.
 Even if combustible gas conversion is set, readings will be displayed if other combustible gases arepresent in the usage environment.
 If hydrogen (H2) is set for gas conversion, readings will not be displayed for gases marked “×” inthe “Conversion when conversion is restricted” column in ‘<Combustible gas conversion list>’, evenif such gases are present in the usage environment.

44 / 111

6 Setting Procedure

6-2 Display mode settings

1

Press the MODE button several times in measurement mode to display the LIST screen.

2

Press the AIR button to select the combustible gas to beconverted.
Pressing the AIR button cycles the display through the list of
combustible gases.
The default setting is the calibration gas for the combustible gas
sensor.

3

Press the MODE button.
Combustible gas conversion is set.
[END] appears and the display returns to the screen in Step 1.

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6 Setting Procedure

6-2 Display mode settings

6-2-4 Adjustment data display
Displays the date on which gas adjustment was performed.

NOTE
 This is displayed with ATEX/UKEX/IECEx specifications.
 Adjustment data is not displayed if the adjustment expiration display setting is disabled in user
mode. The default setting is [On].

1

Press the MODE button several times in measurement mode to display the CAL.DATA screen.

2

Press the AIR button.
Pressing the AIR button cycles the display through [CH4 or HC] → [O2] → [H2S] → [CO] → [CH4 or
HC] in sequence.

3

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

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6 Setting Procedure

6-2 Display mode settings

6-2-5 Bump test data display
Displays the date on which the bump test was performed.

NOTE Bump test data is not displayed if the bump test expiration display setting is disabled in user mode.
The default setting is [OFF].
 The bump test data is also updated automatically when gas adjustment is performed.

1

Press the MODE button several times in measurement mode to display the BMP.DATA screen.

2

Press the AIR button.
Pressing the AIR button cycles the display through [CH4] → [O2] → [H2S] → [CO] → [CH4] insequence.

3

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

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6 Setting Procedure

6-2 Display mode settings

6-2-6 Snap log data display
Snap log data is data for gas concentrations recorded during measurement.
Select the recorded date, time, and memory number to display the corresponding gas concentration.

NOTE For information on how to record snap log data, refer to ‘5-5-3 Snap log recording’.

1

Press the MODE button several times in measurement mode to display the REC.DATA screen.

2

Press the AIR button.
Pressing the AIR button cycles through the log data menu items.
Select the log data to be checked.
The log data menu items displayed are the date, time, and memory
number.

3

Press the MODE button.
The gas concentration is displayed for the log data selected.

4

Press the MODE button.
The display returns to the log data menu.
To continue and display other log data, repeat the procedure in Steps
2 - 4.

5

Hold down the AIR button and MODE button at the same time.
The display returns to the screen in Step 1.

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6 Setting Procedure

6-2 Display mode settings

6-2-7 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
and oxygen.
 Pressing the AIR button and the MODE button at the same time while an alarm setpoint isdisplayed lets you test the corresponding alarm. Press either button to reset the alarm.

1

Press the MODE button several times in measurement mode to display the ALARM-P screen.

2

Press the AIR button.
Pressing the AIR button cycles the display through [F.S.] (FULL SCALE) → [WARNING (1st alarm)] →[ALARM (2nd alarm]] → [ALARM H (3rd alarm)] → [STEL] → [TWA] → [F.S.] (FULL SCALE) insequence.

3

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

49 / 111

6 Setting Procedure

6-3 User mode

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

6-3-1 Switching to user mode
1

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

2

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

3

Press the AIR button to select the required setting item,
then press the MODE button.
The user mode setting screen is displayed.

NOTE
 To return while configuring user mode menu settings, hold down the AIR button and MODE button
at the same time.
 A password input screen is displayed to access user mode if the password setting is enabled.
Press the AIR button to select the number for the currently selected digit, then press the MODE
button to confirm. The user mode menu is displayed once the (four-digit) password has beencorrectly entered. For information on setting the password, refer to ‘6-4-14 Password setting’.
The default password settings are as follows:
Default: [On], Password: [0000]
・ Japan EX specifications:Default: [OFF]・ ATEX/UKEX/IECEx specifications:<Switching from user mode to measurement mode>1

Press the AIR button on the user mode menu to select[START], then press the MODE button.

The product operates in the same way as at power-on andswitches to measurement mode.

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6 Setting Procedure

6-3 User mode

6-3-2 User mode setting items
Setting item (Screen notation)

LCD display

Reference

Bump test ([BUMP])‘6-4-1 Bump test’Gas adjustment ([GAS CAL])‘6-4-2 Gas adjustment’

Adjustment expiration setting([CAL SET])* Displayed with ATEX/UKEX/IECEx
specifications only

‘6-4-3 Adjustment expiration
setting’

Bump test setting ([BUMP.SET])‘6-4-4 Bump test setting’

Alarm setpoint setting ([ALARM-P])‘6-4-5 Alarm setpoint setting’Lunch break on/off ([LUNCH])‘6-4-6 Lunch break on/off’

Confirmation beep setting ([BEEP])‘6-4-7 Confirmation beep setting’

LCD lighting time setting ([BL TIME])‘6-4-8 LCD lighting time setting’51 / 111

6 Setting Procedure

Setting item (Screen notation)

6-3 User mode

LCD display

Reference

Key operation tone on/off ([KEY.TONE])‘6-4-9 Key operation tone on/off’

Display mode item display on/off([DISP.SET])‘6-4-10 Display mode item display
on/off’Zero suppression on/off ([ZERO.SUP])‘6-4-11 Zero suppression on/off’

Zero follower on/off ([ZERO.FLW])‘6-4-12 Zero follower on/off’

Date and time setting ([DATE])‘6-4-13 Date and time setting’Password setting ([PASS-W])‘6-4-14 Password setting’

ROM/SUM display ([ROM/SUM])‘6-4-15 ROM/SUM display’Measurement start ([START])-----

52 / 111

6 Setting Procedure

6-4 User mode settings

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

6-4-1 Bump test
The product includes a function for performing a bump test (function check). User mode lets you performbump tests and switch from a bump test to measurement mode.
The product automatically switches to measurement mode following a successful bump test.
* The product does not automatically switch to measurement mode if multiple cylinders are set.
For information on the bump test procedure, refer to ‘7-3 Bump test’.

NOTE To exit setting, press the AIR button to select [ESCAPE], then press the MODE button. The display
returns to the user mode menu.

6-4-2 Gas adjustment
The product can be adjusted using AUTO adjustment with preset gas concentrations in addition to fresh
air adjustment.
Gas adjustment requires dedicated tools and a calibration gas. Contact Riken Keiki.
The product automatically switches to measurement mode following a successful gas adjustment.
* The product does not automatically switch to measurement mode if multiple cylinders are set.
For information on the gas adjustment procedure, refer to ‘7-2 Gas adjustment’.

NOTE To exit setting, press the AIR button to select [ESCAPE], then press the MODE button. The display
returns to the user mode menu.

6-4-3 Adjustment expiration setting
The gas adjustment expiration display can be enabled or disabled, the adjustment expiration interval canbe set, and the operation performed after adjustment has expired can be set.

NOTE The adjustment expiration setting is a function available with ATEX/UKEX/IECEx specifications. It isdisplayed with ATEX/UKEX/IECEx specifications.

53 / 111

6 Setting Procedure

6-4 User mode settings

Adjustment expiration setting is configured in [CAL SET] in user mode.
The following menu displayed in [CAL SET] allows individual items to be set.

<[CAL SET] menu>
User mode menu
[CAL SET][CAL.RMDR][CAL.INT][CAL.EXPD][ESCAPE]<[CAL SET] menu selection>
1

Press the AIR button on the user mode menu to select[CAL SET], then press the MODE button.

2

Press the AIR button to select the required setting item, thenpress the MODE button.

Screen notation

LCD display

Reference[CAL.RMDR]‘Adjustment expiration display
on/off’[CAL.INT]‘Adjustment expiration interval
setting’[CAL.EXPD]‘Operation setting after adjustment
expiration’[ESCAPE]-----

54 / 111

6 Setting Procedure

6-4 User mode settings

NOTE
 To exit the [CAL SET] menu, press the AIR button to select [ESCAPE], then press the MODE
button. The display returns to the user mode menu.

<Adjustment expiration display on/off>This enables and disables the adjustment expiration display.
1

Press the AIR button on the [CAL SET] menu to select[CAL.RMDR], then press the MODE button.

2

Press the AIR button to select on or off for the adjustment
expiration display.
Pressing the AIR button lets you select [On] or [OFF] for the
adjustment expiration display.
The default setting is [On].

3

Press the MODE button.
[END] appears and the display returns to the screen in Step 1.

<Adjustment expiration interval setting>This sets the interval until the adjustment expiration notification is given after performing gas adjustment.
1

Press the AIR button on the [CAL SET] menu to select[CAL.INT], then press the MODE button.

2

Press the AIR button to select the number of days until
adjustment expiration.
Pressing the AIR button lets you select the adjustment expirationinterval from [1] - [1000] days.
The default setting is [365] days.

3

Press the MODE button.
[END] appears and the display returns to the screen in Step 1.

55 / 111

6 Setting Procedure

6-4 User mode settings<Operation setting after adjustment expiration>
This lets you select the operation performed after adjustment has expired.
1

Press the AIR button on the [CAL SET] menu to select[CAL.EXPD], then press the MODE button.

2

Press the AIR button to select the operation performed after
adjustment has expired.
Pressing the AIR button displays the following operations
performed after adjustment expiration:
・ [CONFIRM]: The behavior differs depending on the operation.
Press the AIR button to proceed to measurement
mode. Press the MODE button to proceed to
AUTO adjustment cylinder settings.
・ [CANT.USE]: Measurement mode is not available. Either press
the MODE button or wait six seconds toautomatically proceed to AUTO adjustment
cylinder settings.
・ [NONE]:The behavior differs depending on the operation.
When adjustment expiration is indicated, press
the MODE button to proceed to AUTO
adjustment cylinder settings. If you do nothing,
the product will proceed to measurement mode
after about six seconds.
The default setting is [CONFIRM].

3

Press the MODE button.
[END] appears and the display returns to the screen in Step 1.

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6 Setting Procedure

6-4 User mode settings

6-4-4 Bump test setting
Bump test setting is configured in [BUMP.SET] in user mode.
The following menu displayed in [BUMP.SET] allows individual items to be set.

<[BUMP.SET] menu>
User mode menu
[BUMP.SET][SETTING][GAS.TIME][CHECK][CAL.TIME][AUTO.CAL][ESCAPE][BMP.RMDR][BMP.INT][BMP.EXPD][ESCAPE]<[BUMP.SET] menu selection>
1

Press the AIR button on the user mode menu to select[BUMP.SET], then press the MODE button.

2

Press the AIR button to select the required setting item, thenpress the MODE button.

Screen notation

LCD display

Reference[SETTING]‘<Bump time selection>’‘<Bump tolerance selection>’‘<Gas adjustment time selection after bumptest>’‘<Gas adjustment after bump test on/off>’[BMP.RMDR]‘<Bump test expiration display on/off>’

57 / 111

6 Setting Procedure

Screen notation

6-4 User mode settings

LCD display

Reference[BMP.INT]‘<Bump test expiration interval selection>’[BMP.EXPD]‘<Operation setting after bump test
expiration>’[ESCAPE]

-----

NOTE
 To exit the [BUMP.SET] menu, press the AIR button to select [ESCAPE], then press the MODE
button. The display returns to the user mode menu.
 To exit the [SETTING] menu, press the AIR button to select [ESCAPE], then press the MODE
button. The display returns to the [BUMP.SET] menu.

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6 Setting Procedure

6-4 User mode settings<Bump time selection>
This sets the time for introducing the test gas.
1

Press the AIR button on the [BUMP.SET] menu to select[SETTING], then press the MODE button.
The [SETTING] menu is displayed.

2

Press the AIR button to select [GAS.TIME], then press the
MODE button.

3

Press the AIR button to select the bump time.
Pressing the AIR button lets you select a bump time from [30],[45], [60], and [90] seconds.
The default setting is [30] seconds.

4

Press the MODE button.
[END] appears and the display returns to the screen in Step 2.

5

Press the AIR button to select [ESCAPE], then press the
MODE button.
The display returns to the screen in Step 1.

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6 Setting Procedure

6-4 User mode settings<Bump tolerance selection>
This sets the threshold for checking the test gas.
Gases other than oxygen: Adjustment concentration ± (adjustment concentration  bump tolerance)
Oxygen:Adjustment concentration ± (difference between adjustment concentration and20.9 %  bump tolerance)
1

Press the AIR button on the [BUMP.SET] menu to select[SETTING], then press the MODE button.
The [SETTING] menu is displayed.

2

Press the AIR button to select [CHECK], then press the MODE
button.

3

Press the AIR button to select the bump tolerance.
Pressing the AIR button lets you select a bump tolerance from[10], [20], [30], [40], and [50] %.
The default setting is [50] %.

4

Press the MODE button.
[END] appears and the display returns to the screen in Step 2.

5

Press the AIR button to select [ESCAPE], then press the
MODE button.
The display returns to the screen in Step 1.

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6 Setting Procedure

6-4 User mode settings<Gas adjustment time selection after bump test>
This selects the time for gas adjustment after a bump test has failed.
1

Press the AIR button on the [BUMP.SET] menu to select[SETTING], then press the MODE button.
The [SETTING] menu is displayed.

2

Press the AIR button to select [CAL.TIME], then press the
MODE button.

3

Press the AIR button to select the gas adjustment time after
bump test.
Pressing the AIR button lets you select [90] or [120] seconds as
the gas adjustment time after a bump test.
The default setting is [90] seconds.

4

Press the MODE button.
[END] appears and the display returns to the screen in Step 2.

5

Press the AIR button to select [ESCAPE], then press the
MODE button.
The display returns to the screen in Step 1.

61 / 111

6 Setting Procedure

6-4 User mode settings<Gas adjustment after bump test on/off >This enables and disables the function for automatic gas adjustment if a bump test fails.
1

Press the AIR button on the [BUMP.SET] menu to select[SETTING], then press the MODE button.
The [SETTING] menu is displayed.

2

Press the AIR button to select [AUTO.CAL], then press the
MODE button.

3

Press the AIR button to enable or disable gas adjustment
after a bump test fails.
Pressing the AIR button lets you select [On] or [OFF] for gas
adjustment after a bump test fails.
The default setting is [On].

4

Press the MODE button.
[END] appears and the display returns to the screen in Step 2.

5

Press the AIR button to select [ESCAPE], then press the
MODE button.
The display returns to the screen in Step 1.

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6 Setting Procedure

6-4 User mode settings<Bump test expiration display on/off>This enables and disables the bump test expiration display.
1

Press the AIR button on the [BUMP.SET] menu to select[BMP.RMDR], then press the MODE button.

2

Press the AIR button to enable or disable the bump test
expiration display.
Pressing the AIR button lets you select [On] or [OFF] for the bump
test expiration display.
The default setting is [OFF].

3

Press the MODE button.
[END] appears and the display returns to the screen in Step 1.

<Bump test expiration interval selection>
This sets the number of days until bump test expiration is displayed after a bump test.
1

Press the AIR button on the [BUMP.SET] menu to select[BMP.INT], then press the MODE button.

2

Press the AIR button to select the number of days until bump
test expiration.
Pressing the AIR button lets you select the bump test expirationinterval from [0] - [365] days.
The default setting is [30] days.

3

Press the MODE button.
[END] appears and the display returns to the screen in Step 1.

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6 Setting Procedure

6-4 User mode settings<Operation setting after bump test expiration>
This selects the operation after the bump test expiration display.
1

Press the AIR button on the [BUMP.SET] menu to select[BMP.EXPD], then press the MODE button.

2

Press the AIR button to select the operation performed after
bump test expiration.
Pressing the AIR button displays the following operations insequence:
・ [CONFIRM]: The behavior differs depending on the operation.
Press the AIR button to proceed to measurement
mode. Press the MODE button to proceed tobump test cylinder settings.
・ [CANT.USE]: Measurement mode is not available. Press the
MODE button or wait six seconds to automaticallyproceed to bump test cylinder settings.
・ [NONE]:The behavior differs depending on the operation.
When adjustment expiration is indicated, press
the MODE button to proceed to bump test
cylinder settings. If you do nothing, the productwill proceed to measurement mode after about six
seconds.
The default setting is [CONFIRM].

3

Press the MODE button.
[END] appears and the display returns to the screen in Step 1.

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6 Setting Procedure

6-4 User mode settings

6-4-5 Alarm setpoint setting
Sets the first, second, and third alarm setpoints and STEL and TWA alarm setpoints, and also allows the
setpoint settings to be reset to their default values.

<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 %Lower limit
1 %LEL(Recommended range: at least 10 %LEL)
12 ppm(Recommended range: at least 25 ppm)
0.5 ppm(Recommended range: at least 1.0 ppm)
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 %
25.0 %NOTE
 Set the alarm setpoints as follows: First alarm ≤ second alarm ≤ third alarm (first alarm ≥ second
alarm for oxygen) Use the product with the alarms set to within a range compatible with device performance. Alarm
setpoints below the recommended range may result in false alarms.

1

Press the AIR button on the user mode menu to select[ALARM-P], then press the MODE button.

2

Press the AIR button to select the gas type, then press the
MODE button.
Pressing the AIR button alternately displays the detection target
gas and the alarm setpoint reset screen.

3

Press the AIR button to select the first alarm setpoint
numerical value, then press the MODE button.

4

Press the AIR button to select the second alarm setpoint
numerical value, then press the MODE button.

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6 Setting Procedure

6-4 User mode settings

5

Press the AIR button to select the third alarm setpoint
numerical value, then press the MODE button.
For toxic gases, the setting screens for [STEL] and [TWA] aresubsequently displayed. Set these in the same way.
[END] appears and the display returns to the screen in Step 2.

6

To exit setting, press the AIR button to select [ESCAPE], thenpress the MODE button.
The display returns to the user mode menu.

NOTE
 For more information on how to reset alarm setpoints, refer to ‘<Resetting alarm setpoints>’ on thenext page. The alarm setpoint reset ([DEF.ALMP]) screen may not appear if the product is not set
correctly. If this occurs, contact Riken Keiki.
 For more information on alarm setpoints, refer to ‘4 Alarm Activation’.

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6 Setting Procedure

6-4 User mode settings<Resetting alarm setpoints>
This restores alarm setpoints to their default settings.
1

Press the AIR button on the user mode menu to select[ALARM-P], then press the MODE button.

2

Press the AIR button several times to select [DEF.ALMP],
then press the MODE button.

3

Press the MODE button.
To cancel the reset, press the AIR button.

4

Press the MODE button.
To cancel alarm setpoint resetting, press the AIR button.

The alarm setpoint is reset.
[END] appears and the display returns to the screen in Step 2.
5

Press the AIR button to select [ESCAPE], then press the
MODE button.
The display returns to the user mode menu.

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6 Setting Procedure

6-4 User mode settings

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 mode menu to select[LUNCH], then press the MODE button.

2

Press the AIR button to select on or off for the lunch breakfunction.
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 will appear next time the power isturned on to confirm whether to retain the TWA and PEAK values from the last time the power was
turned off and resume measurement or to reset the values from the last time the power was turnedoff.

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6 Setting Procedure

6-4 User mode settings

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. [BMP/CAL], [ALM.ALRT], and[B/C/ALM] can also be set to use the following functions:
1. [BMP/CAL]
 Starts operation when adjustment has expired with the adjustment expiration display enabled or when
the bump test has expired with the bump test expiration display enabled.
 Once operation starts, it does not stop until adjustment or bump testing has been performed for all of
the gas types supported. (Excludes H2 canceling.*) The LED lights up for about one second for each interval set.
2. [ALM.ALRT] Starts operation when a gas alarm is triggered. (Includes negative sensor failures.) Once operation starts, it does not stop until adjustment or bump testing has been performed for all of
the gas types supported. (Excludes H2 canceling.*) The LED lights up for about one second for each interval set.
3. [B/C/ALM]
 Starts operation when adjustment has expired with the adjustment expiration display enabled or when
the bump test has expired with the bump test expiration display enabled.
 Once operation starts, it does not stop until adjustment or bump testing has been performed for all of
the gas types supported. (Excludes H2 canceling.*) Starts operation when a gas alarm is triggered. (Includes negative sensor failures.) The LED lights up for about one second for each interval set.
* Hydrogen (H2) gas is not included in the stop conditions when using the carbon monoxide sensor (ESRA1CP) equipped with a hydrogen interference correction function.

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6 Setting Procedure

6-4 User mode settings

Confirmation beep setting is configured in [BEEP] in user mode.
The following menu displayed in [BEEP] allows individual items to be set.

<[BEEP] menu>
User mode menu
[BEEP][BEEP.SEL][BEEP.INT][ESCAPE]<[BEEP] menu selection>
1

Press the AIR button on the user mode menu to select[BEEP], then press the MODE button.

2

Press the AIR button to select the required setting item, thenpress the MODE button.

Screen notation

LCD display

Reference[BEEP.SEL]‘<Beep operation setting>’[BEEP.INT]‘<Beep interval setting>’[ESCAPE]

-----

NOTE
 To exit the [BEEP] menu, press the AIR button to select [ESCAPE], then press the MODE button.
The display returns to the user mode menu.

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6 Setting Procedure

6-4 User mode settings<Beep operation setting>This lets you set the confirmation beep operation.
However, altering the beep operation setting will stop the [BMP/CAL], [ALM.ALRT], and [B/C/ALM]
operations.
1

Press the AIR button in the [BEEP] menu to select[BEEP.SEL], then press the MODE button.

2

Press the AIR button to select the confirmation beep
operation.
Pressing the AIR button displays the following operations insequence:
・ [OFF]・ [LED] (LED only)
・ [BUZZER] (buzzer only)
・ [LED+BUZ] (LED and buzzer)
・ [BMP/CAL]・ [ALM.ALRT]・ [B/C/ALM]
The default setting is [OFF].

3

Press the MODE button.
[END] appears and the display returns to the screen in Step 1.

<Beep interval setting>This lets you set the interval between confirmation beeps.
1

Press the AIR button on the [BEEP] menu to select[BEEP.INT], then press the MODE button.

2

Press the AIR button to select the beep interval.
Pressing the AIR button lets you select a beep interval of [0.5] orfrom [1] - [99] minutes.
The default setting is [5] minutes.

3

Press the MODE button.
[END] appears and the display returns to the screen in Step 1.

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6 Setting Procedure

6-4 User mode settings

6-4-8 LCD lighting time setting
The duration for which the LCD display backlight remains lit can be set.
1

Press the AIR button on the user mode menu to select[BL TIME], then press the MODE button.

2

Press the AIR button to select the backlight lighting time.
Pressing the AIR button lets you select a backlight lighting time of[OFF] or from [1] - [255] seconds.
The default setting is [30] seconds.

3

Press the MODE button.
[END] appears and the display returns to the user mode menu.

6-4-9 Key operation tone on/off
This enables and disables the key operation tone.
1

Press the AIR button on the user mode menu to select[KEY.TONE], then press the MODE button.

2

Press the AIR button to select on or off for the key operation
tone.
Pressing the AIR button lets you select [On] or [OFF] for the key
operation tone.
The default setting is [On].

3

Press the MODE button.
[END] appears and the display returns to the user mode menu.

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6 Setting Procedure

6-4 User mode settings

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 disabled, items such as combustible gas conversion setting ([HC GAS]) are not displayed indisplay mode.
1

Press the AIR button on the user mode menu to select[DISP.SET], then press the MODE button.

2

Press the AIR button to enable or disable the display mode
item display.
Pressing the AIR button lets you select [On] or [OFF] for the
display mode item display.
Japan EX specifications are set to [OFF]. ATEX/UKEX/IECEx
specifications are set to [On].

3

Press the MODE button.
[END] appears and the display returns to the user mode menu.

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6 Setting Procedure

6-4 User mode settings

6-4-11 Zero suppression on/off
This enables and disables zero suppression (or air suppression with an oxygen sensor).
Gas detection sensors are affected by environmental factors such as temperature and humidity
characteristics. They are also substantially affected by the interference of the target gas. Environmental
and interference effects may cause the product reading to fluctuate around zero.
The zero suppression function is designed to suppress notifications of fluctuations around zero. The
function suppresses reading fluctuations below the set value and displays zero instead (or 20.9 % for an
oxygen sensor).

NOTE This is displayed with Japan EX specifications.
 Even when enabled, the zero suppression function will function only in measurement mode anddisplay mode.
 All readings in the range from zero to the negative suppression value indicated in the <Zerosuppression values> table are suppressed. Values from the negative suppression value to the M
OVER value will be displayed, but accurate measurements cannot be achieved in this state. A
fresh air adjustment should be performed. For information on M OVER values, refer to ‘4-2 Gas
alarm setpoints’.
<Zero suppression values>
Combustible
Target gas
gas

O2

CO

H2S

2 ppm

0.3 ppm

Smoothing

20.9 % ± 0.5 %(20.4 - 21.4 %)Cut-airCut-off

Cut-off-5 %LEL-0.5 %-25 ppm-5.0 ppm

Cut-off

Cut-off

Cut-off

Cut-off

Suppression value

2 - 5 %LEL

Suppression type
Negative
suppression value
Negative
suppression type1

Press the AIR button on the user mode menu to select[ZERO.SUP], then press the MODE button.

2

Press the AIR button to select the sensor, then press the
MODE button.
Pressing the AIR button displays the detection target gases insequence.

3

Press the AIR button to enable or disable zero suppression.
Pressing the AIR button lets you select [On] or [OFF] for zero
suppression.
The default setting is [On].

4

Press the MODE button.
[END] appears and the display returns to the screen in Step 2.

5

To exit setting, press the AIR button to select [ESCAPE], thenpress the MODE button.
The display returns to the user mode menu.

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6 Setting Procedure

6-4 User mode settings

6-4-12 Zero follower on/off
This enables and disables the zero follower function.
The sensors used in the product may exhibit sensitivity variations when used for extended periods.
The zero follower function stabilizes the zero point by adjusting reading fluctuations at the zero point that
result from extended periods of use.
Combustible gas sensors
Sensors other than
combustible gas sensors

The sensor output is tracked to zero the value if output fluctuations
occur below the stipulated value when the power is turned on.
The sensor output is tracked to zero the value if the sensor output
repeatedly drops below zero when the power is turned on.

* The zero follower function is enabled when the power is turned on with both combustible gas and other gases.

NOTE This is displayed with Japan EX specifications.
 The zero follower function is not enabled for oxygen sensors.
 When the zero follower function is enabled, the product will not comply with EN-60079-2-1.
 When the zero follower function is enabled, the product will not comply with JIS 8206:2020 even if
the combustible gas is CH4.

1

Press the AIR button on the user mode menu to select[ZERO.FLW], then press the MODE button.

2

Press the AIR button to select the sensor, then press the
MODE button.
Pressing the AIR button displays the detection target gases otherthan [O2] (oxygen) in sequence.

3

Press the AIR button to select zero follower on or off.
Pressing the AIR button lets you select zero follower [On] or [OFF].
The default setting is [On] for combustible gas, carbon monoxide,and hydrogen sulfide.

4

Press the MODE button.
[END] appears and the display returns to the screen in Step 2.

5

To exit setting, press the AIR button to select [ESCAPE], thenpress the MODE button.
The display returns to the user mode menu.

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6 Setting Procedure

6-4 User mode settings

6-4-13 Date and time setting
The internal clock date (year, month, day) and time (hours and minutes) can be set.
1

Press the AIR button on the user mode menu to select[DATE], then press the MODE button.

2

Press the AIR button to select the required setting item, thenpress the MODE button.
The item currently blinking can be set.

3

Repeat Step 2.
Set the date and time in the sequence year → month → day → hour → minute.
Press the MODE button after setting the minutes. [END] appears
and the display returns to the user mode menu.

6-4-14 Password settingThis lets you protect access to user mode using a password. When the password setting is enabled, apassword can be set as a four-digit number in the range from [0000] - [9999].
1

Press the AIR button on the user mode menu to select[PASS-W], then press the MODE button.

2

Press the AIR button to select [On], then press the MODE
button.
The password input screen is displayed.
Selecting [OFF] unlocks password protection and exits the setting.

3

Press the AIR button to select from [0] - [9], then press the
MODE button.
The number is input as the first digit of the password and thesecond digit blinks.
The default setting is [0000].
The password can be set in the range from [0000] - [9999].

4

Repeat Step 3.
After entering the final digit, press the MODE button.
[END] appears and the display returns to the user mode menu.

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6 Setting Procedure

6-4 User mode settings<Accessing user mode when password-protected>
1With the power turned off, press the AIR button and POWER
button at the same time.
Release the buttons when the buzzer blips. The password input
screen is displayed.

2

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

3

Repeat Step 2.
The user mode menu is displayed once the final digit of thepassword has been entered.
If the password entered is incorrect, an error is displayed. The
product switches to measurement mode as described in ‘5-3-2
Screen transition from powering on to measurement mode’.

6-4-15 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 mode menu to select[ROM/SUM], then press the MODE button.

The following information isdisplayed alternately:・ [MAIN.ROM]・ [SENS.ROM]

2

Press the MODE button.
[END] appears and the display returns to the user mode menu.

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7 Maintenance

7-1 Maintenance intervals and items

7

7

Maintenance

The product is an important safety and disaster prevention device.
Perform product maintenance at regular intervals to ensure performance and to improve disasterprevention and safety reliability.

7-1 Maintenance intervals and 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

Inspection details

Daily
maintenance

Monthly
maintenanceRegularmaintenanceBattery level

Check to confirm that battery levels areadequate.

〇〇〇

Concentration
display

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

〇

〇

〇

Main unit
operation

Check the LCD display to confirm the absence offault indication.

〇

〇

〇

FilterCheck to confirm that the filter is not dirty.

〇

〇

〇

Alarm test

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

－

〇

〇

Span adjustment

Perform span adjustment using a calibration gas.

－

－

〇

Gas alarm check

Check the gas alarm with a calibration gas.

－

－

〇

WARNING If you encounter a product abnormality, 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 adjusted using span adjustment, the readings are not restored after fresh
air adjustment, or the readings fluctuate, the sensors are at the end of their life. Contact Riken
Keiki to request checking.

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7 Maintenance

7-1 Maintenance intervals and items

7-1-1 Maintenance service
Riken Keiki provides services related to regular maintenance, including span adjustment,
as well as other adjustments and maintenance.
Preparing calibration gas requires the use of dedicated tools, such as gas cylinders of the specified
concentration and gas sampling bags.
Our certified service engineers have expert knowledge of the dedicated tools used for these services,along with expertise in products. Please take advantage of the Riken Keiki maintenance service tomaintain safe operation of the product. The major maintenance service items are as follows. Contact
Riken Keiki for more information.

<Main maintenance service details>
Battery level
check

Checks battery levels.

Concentration
display check

Checks to confirm that the concentration reading is 0 (or 20.9 % for oxygen meter)using a zero gas.
Zero adjustment (air adjustment) if the reading is offset

Filter check

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

Alarm test

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

Span adjustment

Adjusts sensitivity using a calibration gas.

Gas alarm check

Checks the gas alarm using a calibration gas.
・ Check alarms. (Confirm alarm activation when alarm setpoint is reached.)
・ Check delay time. (Check delay time until alarm activation.)・ Checks the buzzer, LEDs, vibration, and concentration display. (Checks
operation for each of the three-step alarms.)

Product cleaning
and repair(visualinspection)

Checks the product exterior for dirt and cleaning/repairing of visible areas
Parts are replaced if cracked or damaged.

Product
operation check

Operates the buttons to check function operations and parameters.

Degraded part
replacement

Replaces degraded components such as sensors and filters.

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7 Maintenance

7-2 Gas adjustment

7-2 Gas adjustment
The product can be adjusted using AUTO adjustment with preset gas concentrations in addition to fresh
air adjustment.
Span adjustment requires a calibration gas. Contact Riken Keiki.

CAUTION Do not use lighter gas to check the sensitivity of the product. Constituents in lighter gas may
degrade sensor performance.

7-2-1 Preparation for gas adjustment<Required equipment/materials>
 Calibration gas
 Gas sampling bag<Recommended calibration gas concentrations>
Detection target gas

Sensor model

Calibration gas

Calibration gas
concentration

Combustible gas (HC)NCR-6309

Isobutane (i-C4H10)

50 %LEL (0.9 %)Combustible gas (CH4)

NCR-6309

Methane (CH4)

50 %LEL (2.5 %)Hydrogen sulfide (H2S）

ESR-A1DP or
ESR-A13i

Hydrogen sulfide (H2S）

25.0 ppm

Oxygen (O2)ESR-X13P

Oxygen (O2)nitrogen diluted

12.0 % or nitrogen

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

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

Hydrogen (H2)
air diluted

500 ppm* Hydrogen must be adjusted in the range of 10 °C - 30 °C.
* The same applies to bump test gas.
* We recommend using cylinders of gas at the concentrations specified above for the calibration gas.

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7 Maintenance

7-2 Gas adjustment<Gas supply method>
Connect the gas sampling bag as shown in the figure below to introduce gas, and wait 60 seconds after
the reading increases before adjusting.

<When open to the atmosphere><When using gas recovery>

Gas sampling bag
Gas samplingtube

Gas sampling bag
Gas samplingtube

Connect to
GAS IN.

Connect to
GAS IN.
To GAS OUT(gas sampling bag)

To GAS OUT(open to atmosphere)
Gas sampling bag (for recovery)

WARNING
About the calibration gas
 Do not use lighter gas to check the sensitivity of the product. Constituents in lighter gas may
degrade sensor performance.
 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 adjustment.
Gas adjustment location
 Do not perform gas adjustment in a confined space.
 Do not perform gas adjustment 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) gas adjustment
 The carbon monoxide sensor with hydrogen interference correction function (ESR-A1CP) must be
adjusted separately for carbon monoxide and hydrogen.
 The carbon monoxide and hydrogen used for adjustment must each be a single gas. Adjustment
can be performed using a gas mixture, but it will result in poor sensitivity adjustment and inaccurate
concentration readings.
 If hydrogen sensitivity is not adjusted, carbon monoxide readings may be slightly higher or lower
than the actual concentrations when measured in environments where hydrogen is also present.

WARNING When feeding gas, it should either be discharged to a safe location with the GAS OUT outlet open
to the atmosphere or collected using a gas sampling bag.
 Hydrogen span adjustment may become impossible if the product is used or stored for extended
periods in dry environments. If [FAIL AUTO.CAL] is displayed during hydrogen span adjustment,
allow the product to stand overnight in a sufficiently humid environment before repeating the gas
adjustment. However, if carbon monoxide span adjustment is no longer possible, contact Riken
Keiki to request sensor replacement.

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7 Maintenance

7-2 Gas adjustment

7-2-2 Gas adjustment setting
Gas adjustment setting is configured in [GAS CAL] in user mode.
The following menu displayed in [GAS CAL] allows fresh air adjustment and AUTO adjustment to be
performed, as well as AUTO adjustment setting to be configured.

<[GAS CAL] menu>
User mode menu
[GAS CAL][AIR CAL][AUTO.CAL][CYL A] - [CYL E][START][CAL-P][CYL SEL][ESCAPE][ESCAPE]<[GAS CAL] menu selection>
1

Press the AIR button on the user mode menu to select[GAS CAL], then press the MODE button.

2

Press the AIR button to select the required setting item, thenpress the MODE button.

Screen notation

LCD display

Reference[AIR CAL]‘7-2-3 Fresh air adjustment’[AUTO.CAL]‘7-2-4 AUTO adjustment’‘7-2-5 AUTO adjustment setting’82 / 111

7 Maintenance

7-2 Gas adjustment[ESCAPE]

-----

NOTE
 To exit the [GAS CAL] menu, press the AIR button to select [ESCAPE], then press the MODE
button. The display returns to the user mode menu.
 To exit the [AUTO.CAL] menu, press the AIR button to select [ESCAPE], then press the MODE
button. The display returns to the [GAS CAL] menu.
 It is possible to switch from AUTO adjustment to measurement mode. Press the AIR button on the[AUTO.CAL] menu to select [START], then press the MODE button. The product operates in thesame way as at power-on and switches to measurement mode.

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7 Maintenance

7-2 Gas adjustment

7-2-3 Fresh air adjustment
WARNING 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 perform zeroadjustment correctly and potentially result in hazardous conditions in the event of actual gas leaks.

CAUTION Always perform fresh air adjustment under conditions of pressure, temperature, and humidity
similar to those in the operating environment and in fresh air.
 Wait for the reading to stabilize before performing fresh air adjustment.

1

Press the AIR button on the [GAS CAL] menu to select[AIR CAL], then press the MODE button.

2

Hold down the AIR button.

Keep the AIR button pressed for as long as the screen shown on
the right is displayed.
Fresh air adjustment will not be performed if you release thebutton before the screen is displayed or while it is displayed.

3

Release the AIR button once [RELEASE] is displayed.
Fresh air adjustment is performed.

[PASS] is displayed if fresh air adjustment was successful.

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7 Maintenance

7-2 Gas adjustment

The current concentration appears after fresh air adjustment andthe display returns to the screen in Step 1.
[FAIL] is displayed if adjustment was unsuccessful.
[END] appears and the display returns to the screen in Step 1.

NOTE
 If fresh air adjustment fails, [FAIL] appears next to the measurement for the corresponding sensor
together with [AIR CAL]. Press the MODE button to reset the fault alarm (adjustment failure). If asensor fails fresh air adjustment, fresh air adjustment will not be performed, and the concentration
will be calculated using the value before adjustment.
For more information on resetting this fault, refer to ‘9 Troubleshooting’.
 Fresh air adjustment can also be performed in measurement mode. (Refer to ‘5-4 Fresh air
adjustment’.)

7-2-4 AUTO adjustment
This adjusts for each gas at the specified concentration.

NOTE Fresh air adjustment must always be performed before performing AUTO adjustment.

1

Press the AIR button on the [GAS CAL] menu to select[AUTO.CAL], then press the MODE button.

2

Press the AIR button to selectthe cylinder for adjustment,
then press the MODE button.
Pressing the AIR button displays
the gas type and concentration
for cylinders A - E in sequence.
Only those cylinders with gas
types assigned are displayed.
For information on the cylinder
settings, refer to ‘<AUTO
adjustment cylinder settings>’ in‘7-2-5 AUTO adjustment setting’.

3

Introduce the calibration gas,
wait 60 seconds, then press
the MODE button.
Use a stopwatch or similar tocount the time.

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7 Maintenance

7-2 Gas adjustment

AUTO adjustment is performed.

[PASS] is displayed if AUTO adjustment was successful.
[FAIL] is displayed if adjustment was unsuccessful.

The concentration after AUTO adjustment is displayed.
With Japan EX specifications, the concentration and sensor
reserve value after AUTO adjustment are displayed after AUTO
adjustment has been successfully performed.

The product switches to measurement mode.

NOTE The display automatically switches to measurement mode when auto adjustment is successful. The
display does not switch to measurement mode, however, if multiple cylinders are set.
 To switch from auto adjustment to measurement mode, press the AIR button on the [AUTO.CAL]
menu to select [START], then press the MODE button. The product operates in the same way as
when the power has just been turned on and switches to measurement mode.

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7 Maintenance

7-2 Gas adjustment

WARNING On models that detect combustible gases, the screen shown on theright may be displayed with the buzzer sounding and LED flashingafter AUTO adjustment is performed.
If this screen is displayed, some combustible gases cannot be
converted using the combustible gas conversion function. For
information on the types of gases that cannot be converted, refer to‘6-2-3 Combustible gas conversion setting’.
If the screen shown on the right appears, the alarm can be temporarily reset by pressing the
MODE button (or after five seconds if no buttons are pressed).
Note that the screen shown on the right appears when the combustible gas sensor is placed under
the poisoning effects of silicone compounds or halides. If the screen shown on the right isdisplayed, the conversion function can be used only for those gas types marked “〇” in the“Conversion when conversion is restricted” column. To continue to use the conversion function forgas types marked “×”, contact Riken Keiki.

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7 Maintenance

7-2 Gas adjustment

7-2-5 AUTO adjustment settingThis sets the AUTO adjustment cylinders and adjustment concentrations.

<AUTO adjustment cylinder settings>
Set the gas groups (cylinders) for calibration. The cylinders can be set as A - E.
1

Press the AIR button on the [GAS CAL] menu to select[AUTO.CAL], then press the MODE button.

2

Press the AIR button to select [CYL SEL], then press the
MODE button.

3

Press the AIR button to select the sensor, then press the
MODE button.
Pressing the AIR button displays the detection target gases insequence.

4

Press the AIR button to select a cylinder from A - E, thenpress the MODE button.
[END] appears and the display returns to the screen in Step 3.

5

To exit setting, press the AIR button to select [ESCAPE], thenpress the MODE button.
The display returns to the screen in Step 2.

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7 Maintenance

7-2 Gas adjustment<AUTO adjustment calibration gas concentration selection>
Calibration gas concentrations for AUTO adjustment can be set for each sensor.
The calibration gas concentrations can be set in one-digit units within the setting range.
<Calibration gas concentration setting ranges>
Detection target
gas

Sensor model

Calibration gas

1 digit

Lower
limit

Upper
limit

Combustible gas(HC)

NCR-6309

Isobutane(i-C4H10)

1 %LEL

1 %LEL

75 %LEL

Combustible gas(CH4)

NCR-6309

Methane (CH4)

1 %LEL

1 %LEL

75 %LEL

Hydrogen sulfide(H2S）

ESR-A1DPor
ESR-A13i

Hydrogen sulfide(H2S）

0.1 ppm

0.5 ppm

200.0 ppm

Oxygen (O2)ESR-X13P

Oxygen (O2)

0.1 %

0.0 %

18.0 %

Carbon monoxide(CO)

ESR-A1DP or
ESR-A13P

Carbon monoxide
(CO)

1 ppm

12 ppm

2,000 ppm

Carbon monoxide
(CO)

1 ppm

12 ppm

2,000 ppm

Hydrogen (H2)
air diluted

1 ppm

25 ppm

2,000 ppm

Carbon monoxide(CO)

ESR-A1CP* CO (-H2) adjustment should be performed using a single gas and not as a mixture of CO and H2.
* Hydrogen must be adjusted in the range of 10 °C - 30 °C.

1Press the AIR button on the [GAS CAL] menu to select[AUTO.CAL], then press the MODE button.

2

Press the AIR button to select [CAL-P], then press the MODE
button.

3

Press the AIR button to select the sensor, then press the
MODE button.
Pressing the AIR button displays the detection target gases insequence.

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7 Maintenance

7-2 Gas adjustment

4

Press the AIR button to select the adjustment concentration,then press the MODE button.
[END] appears and the display returns to the screen in Step 3.

5

To exit setting, press the AIR button to select [ESCAPE], thenpress the MODE button.
The display returns to the screen in Step 2.

NOTE
 It is possible to switch from AUTO adjustment to measurement mode. Press the AIR button on the[AUTO.CAL] menu to select [START], then press the MODE button. The product operates in thesame way as at power-on and switches to measurement mode.

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7 Maintenance

7-3 Bump test

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

7-3-1 Performing bump test
A bump test can be performed for gas types selected from cylinders A - E. Prepare the bump test gas in
the same way as for the calibration gas. (Refer to ‘7-2-1 Preparation for gas adjustment’.)1

Press the AIR button on the user mode menu to select[BUMP], then press the MODE button.

2

Press the AIR button to selectthe cylinder for the bump test,
then press the MODE button.
Pressing the AIR button displays
the gas type and concentration
for cylinders A - E in sequence.
Only those cylinders with gas
types assigned are displayed.
For information on the cylinder
settings, refer to ‘<AUTO
adjustment cylinder settings>’ in‘7-2-5 AUTO adjustment setting’.

3

Introduce the bump test gas, then press the MODE button.
The bump test is performed.
If set to perform gas adjustment after a bump test failure, the product will automatically perform gas
adjustment in the event of a bump test failure. (Refer to ‘6-4-4 Bump test setting’.)
After the bump test and gas adjustment are completed, the bump test results (left) and gas
adjustment results (right) are displayed together with the readings at the bump test and after gas
adjustment.

Bump test (gas adjustment) results[P]: Passed, [F]: Failed

4

Readings at bump test

Press the MODE button.
[END] is displayed, and the product switches to measurementmode.

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Readings after gas adjustment(Displayed only if gas adjustment
was performed)

7 Maintenance

7-3 Bump test

NOTE The display automatically switches to measurement mode when the bump test is successful. The
display does not switch to measurement mode, however, if multiple cylinders are set.
 To switch from bump test to measurement mode, press the AIR button on the BUMP screen to
select [START], then press the MODE button. The product operates in the same way as when the
power has just been turned on and switches to measurement mode.

CAUTION
On models that detect combustible gases, the screen shown on theright may be displayed with the buzzer sounding and LED flashing
following gas adjustment after a bump test failed.
If this screen is displayed, some combustible gases cannot be
converted using the combustible gas conversion function. For
information on the types of gases that cannot be converted, refer to‘6-2-3 Combustible gas conversion setting’.
If the screen shown on the right appears, the alarm can be temporarily reset by pressing the
MODE button (or after five seconds if no buttons are pressed).
Note that the screen shown on the right appears when the combustible gas sensor is placed under
the poisoning effects of silicone compounds or halides. If the screen shown on the right isdisplayed, the conversion function can be used only for those gas types marked “〇” in the“Conversion when conversion is restricted” column. To continue to use the conversion function forgas types marked “×”, contact Riken Keiki.

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7 Maintenance

7-4 Cleaning procedure

7-4 Cleaning procedure
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 andfirmly wrung out. Do not clean using water, organic solvents or commercially available cleaners, 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 sensor 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 off any moisture on the product using a dry towel or cloth.
② Hold the product firmly and shake about 10 times with the buzzer sound opening facing
downward.
③ Use a towel or cloth to wipe up all moisture drained from the interior.
④ Place the product on a dry towel or cloth and allow to stand at room temperature.

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7 Maintenance

7-5 Parts replacement

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

<Recommended replacement parts list>
Recommended
check interval

Recommended
replacement interval

Quantity

Combustible gas sensor(NCR-6309)

6 months

3 years×1*

O2 sensor (ESR-X13P)

6 months

3 years

×1*

CO/H2S sensor (ESR-A1DP)

6 months

3 years

×1*

CO sensor (ESR-A13P)

6 months

3 years

×1*

CO sensor (ESR-A1CP)

6 months

3 years

×1*

H2S sensor (ESR-A13i)

6 months

3 years

×1*

Pump unit (RP-12)

6 months

1 - 2 years

×1*

Before and afteruse

6 months orwhen contaminated×1

Part No.: 4777 4213 40

Name

Dust filter

Remarks

Interference gas removal
filter3 months

6 months

×1

For combustible gas
sensor (NCR-6309)
Part No.: 4777 9315 90(set of 5)

Interference gas removal
filter3 months

6 months

×1

For CO/H2S sensor(ESR-A1DP)
Part No.: 4777 9314 10Interference gas removal
filter3 months

6 months

×1

CO sensor(ESR-A1CP, ESR-A13P)
Part No.: 4777 9316 60(set of 5)

Humidity control filter

3 months

6 months

×1

For H2S sensor (ESR-A13i)
Part No.: 4777 9317 30(set of 5)

Rubber seals-

3 - 6 years

1 set

*

Battery-

Approx. 500
charging/discharging
cycles×1** A functional check by a qualified service engineer is required after replacement. To ensure safety and the stable
operation of the product, request checking by a qualified service engineer. Contact Riken Keiki to request checking.

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

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7 Maintenance

7-5 Parts replacement

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

<Dust filter replacement procedure>
1

Rotate the filter case 90 degrees counterclockwise toremove from the main unit.

2

Turn the main unit upside down to remove the dust
filter.
The product contains two identical dust filters (primary andsecondary filters) sandwiching a metal mesh.
Turn the main unit upside down and allow the two dust
filters and metal mesh to drop out onto your hand.
If the dust filters do not readily come out, remove withtweezers.

3

Replace with new dust filters.
Sandwich the metal mesh between the two new dust
filters.

4

Rotate the filter case 90 degrees clockwise to reattach
to the main unit.

Filter case

Metal mesh

Primary
dust filter

Secondary
dust filter

WARNING Install the dust filter correctly. Product performance cannot be guaranteed if it is misaligned.
 Replace the dust filter every six months. Replace the filter whenever it becomes contaminatedeven if it is less than six months.
 When replacing the dust filter, follow the procedure described above, tighten the filter casesecurely, and make sure that it is securely attached.
If the filter case is securely attached, 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 seals.
 To maintain performance, we recommend replacing all rubber seals every 3 - 6 years, regardless ofcondition.
 Be sure to use only dust filters specifically intended for use with the product (GX-Force). Use of
non-approved parts may adversely affect gas detection performance and allow water to get inside
the product.

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7 Maintenance

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

Loosen the four screws on the rear of themain unit.

2

Remove the lower case, rubber seals, andinterference gas removal filters in thatsequence, then replace with new
Rubber sealinterference gas removal filters.

3

Reseat the rubber seals in their
original positions.

4

Retighten the four screws on the rearof the main unit diagonally.
* Tightening torque: 25.5 N∙cm ± 3 N∙cm.

Lower caseInterference gas
removal filter
Interference gas removal filter

SensorSensorSensor coverSensorWARNING Install the individual interference gas removal filters correctly. If they are misaligned, gas may leak,preventing correct detection.
 Replace the interference gas removal filters every six months. Replace the filter whenever it
becomes contaminated even if it is less than six months.
 When replacing individual interference gas removal filters, follow the procedure described above,and tighten the screws securely. If the screws are loose, 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 seals.
 To maintain performance, we recommend replacing all rubber seals every 3 - 6 years, regardless ofcondition.
 Be sure to use only interference gas removal filters specifically intended for use with the product(GX-Force). 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 particular sensor. Otherwise gas
may not be detected correctly.

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8 Storage and Disposal

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

88Storage and Disposal

8-1 Procedures for storage or when not in use for extended
periods
The product must be stored in the following environment:
・ At normal temperature, humidity, and pressure in a location not exposed to 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.
Replacement parts should be used in accordance with the descriptions on the nameplates affixed to theparts.

CAUTION Even if you do not intend to use the product for extended periods, turn the power on at least once
every six months to check pump suction (by running the product for approximately three minutes).
Grease inside the pump motor may solidify and prevent operation if the product is not operated forextended periods.

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 gas adjustment if the product is used again after a period in storage.

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

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8 Storage and Disposal

8-3 Product disposal

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. Contact with clothing may result in discoloration or damage to the fabric.
If contact occurs, rinse the area immediately with plenty of water.
 Dispose of batteries in accordance with procedures specified by local authorities.

<Disposal in EU member states>
When disposing of the product in an EU member state, dispose of the battery separately.
The battery removed from the battery compartment 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 fallunder EU Battery Directive 2006/66/EC. Such batteries need to bedisposed of as specified by the latest directive. This pictogram alsomeans batteries must be separated from ordinary waste and disposed ofappropriately.

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9 Troubleshooting

9-1 Product abnormalities

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

9-1 Product abnormalities
Symptom
Screen display

Cause

ActionThe battery is depleted.

Charge the battery in a safe location at an
ambient temperature between +10 °C and +40 °C.

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

To turn on the power, hold down the POWER
button until the buzzer blips, then release thebutton.

Abnormal operation

Effects of sudden static
electricity noise, etc.

Turn off the power, then turn it back on again.

Low battery voltage
alarm indication[FAIL BATTERY]

The battery level is low.

Turn off the power, and charge the battery in asafe location at an ambient temperature between+10 °C and +40 °C.

The power turns off
immediately when it
is turned on.
[TURN OFF]The battery level is low.

Turn off the power, and charge the battery in asafe location at an ambient temperature between+10 °C and +40 °C.

Fresh air is not being
supplied to the product.

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
the bump 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.

Fresh air adjustment
is not possible.
[FAIL AIR CAL]

Bump test is notpossible.

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9 Troubleshooting

Symptom
Screen display

Span adjustment is
not possible.
[FAIL AUTO.CAL]

9-1 Product abnormalities

Cause

ActionThe calibration gas
concentration setting differsfrom the concentration of
the calibration gas supplied.
Low reading due to dry
conditions.
(ESR-A1CP H2 only)

Check to confirm that the calibration gas
concentration setting matches the concentrationof the calibration gas supplied.
Allow the product to stand overnight in a
sufficiently humid environment before repeating
the gas adjustment.

The sensor sensitivity has
degraded.

Contact Riken Keiki to request sensor
replacement.

A sensor abnormality
is indicated inmeasurement mode.
[FAIL SENSOR]

The 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.)

System abnormality[FAIL SYSTEM]

A circuit abnormality
occurred in the main unit.

Error No. 000

Internal ROM abnormality

Error No. 010

Internal RAM abnormality

Error No. 021

Internal FRAM abnormality

Error No. 031

FLASH abnormality

Error No. 080

Circuit voltage abnormality

Error No. 081

PCB abnormality

Error No. 082

Temperature sensor
abnormality

Clock abnormality[FAIL CLOCK]Internal clock abnormality

Pump abnormality[FAIL PUMP]

Pump abnormality

Low flow rateabnormality[FAIL FLOW]
Cannot access usermode.
The charge LED
flashes alternately
green and orange.
Maintenancenotification display[M-LIMIT]Flow passage blockage
Clogged dust filter
Forgot user mode
password.
The temperature is outside
the allowable charging
temperature range.
Notification that the preset
maintenance notification
date has passed(Japan EX specifications
only)

Contact Riken Keiki for repair.

Set the date and time. (Refer to ‘6-4-13 Date andtime setting’.)
If this symptom occurs frequently, the internal
clock may be faulty and must be replaced.
Contact Riken Keiki.
The pump must be replaced.
Contact Riken Keiki for repair.
Check to confirm that there is no dust or moisturecondensation inside the flow paths.
Replace the dust filter.
Contact Riken Keiki.
Charge at an ambient temperature between+10 °C and +40 °C.
The AIR button can be pressed to proceed tomeasurement mode after the maintenancenotification display, but contact Riken Keiki torequest maintenance.
* With standard settings

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9 Troubleshooting

Symptom
Screen display
Adjustment expiration
display[CAL-LMT]

Bump test expiration
display[BMP-LMT]

9-1 Product abnormalities

Cause

ActionNotification that the set
adjustment expiration datehas passed(ATEX/UKEX/IECEx
specifications only)

Press the MODE button to proceed to AUTO
adjustment after the adjustment expiration display.
The AIR button can be pressed to switch tomeasurement mode, but either perform gas
adjustment yourself or contact Riken Keiki torequest maintenance.
* When the operation setting after adjustment
expiration is set to the default setting
Press the MODE button to proceed to bump test
after the bump test expiration display. The AIR
button can be pressed to proceed tomeasurement mode, but bump test should be
performed.
* When the operation setting after bump test
expiration is set to the default setting

Notification that the set
bump test expiration datehas passed

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9 Troubleshooting

9-2 Reading abnormalities

9-2 Reading abnormalities
Symptom

Cause

ActionSensor drift

The reading rises(or drops) andremains unchanged.

Perform fresh air adjustment.
It is difficult to completely eliminate the effects ofinterference gases. Contact Riken Keiki for
information on countermeasures, such as 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.

Presence of interference
gases

Slow leakage

Environmental fluctuations

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

Slow response

Perform fresh air adjustment.
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.

Presence of interference
gases

Effects of noise

Clogged dust filter

Replace the dust filter.

The sensor sensitivity has
degraded.

Contact Riken Keiki to request sensor
replacement.

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10 Product Specifications

10-1 Specifications list

1010

Product Specifications

10-1 Specifications list
10-1-1 Common specifications
Model

GX-Force

Sampling method

Suction type

Suction flow rate

Minimum 0.35 L/min*1 (open flow rate)

Display

LCD digital (7-segment + 14-segment + icons)

Display items

Clock, battery level icon, operating status icon, pump operating status icon

VolumeApprox. 90 dB (mean value at 30 cm)

Gas alarm pattern

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

Gas alarm reset
operation

Self-latching

Fault alarm/self-diagnosis

System abnormality, clock abnormality, sensor abnormality, battery voltage drop,
adjustment failure, pump abnormality, low flow rate abnormality

Fault alarm pattern

Lamp flashing, intermittent buzzer sounding, detail display

Fault alarm reset
operation

Self-latching

Communication
specifications(for data logger)

USB 2.0 (Connector: Type-C)

Power source

Lithium ion battery

Continuous
operating time

Approx. 30 hours (25 °C, fully charged, no alarm, no lighting)

Maximum power
consumption

1.08 W (3.6 V, 300 mA)

Operatingtemperature range

Temporary use environment (About 15 minutes):-40 °C - +60 °C (no sudden changes) *2
Continuous use environment: -20 °C - +50 °C (no sudden changes)

Operating humidity
range

Temporary use environment (About 15 minutes):
0 %RH - 95 %RH (no condensation)
Continuous use environment: 10 %RH - 90 %RH (no condensation)

Operating pressure
range

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

Construction

Dustproof, waterproof construction equivalent to IP67*3, drop resistant to 3 m

Explosion-proof
construction

Intrinsically safe explosion-proof construction, flame-proof enclosure
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10 Product Specifications

Explosion-proof
class

10-1 Specifications list

Explosion-proof electrical equipment type certified (Japan EX):Ex da ia IIC Ta Ga
ATEX/UKEX:
IECEx:II1G Ex da ia IIC T4 Ga
Ex da ia IIC T4 Ga

External
dimensions

Approx. 64 mm (W)  173 mm (H)  47 mm (D) (excluding projections)

WeightApprox. 300 g*1 Use only the supplied dedicated accessories.
*2 Explosion-proof performance is maintained within the range of -20 °C - +60 °C.
Use within this range to ensure explosion-proof performance.
*3 The IP rating does not guarantee that the product is capable of detecting gas during or after exposure to ingressconditions.
If the product has been exposed to ingress conditions, refer to ‘5-2 Preparations for startup’ and check to confirm
that the product can be used normally.

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10 Product Specifications

10-1 Specifications list

10-1-2 Individual sensor specifications
Item

Detection target gas

Sensor model
Detection principle
Detection range
Resolution
Alarm setpoints(Japan EX spec.)

Alarm setpoints(ATEX/UKEX/IECEx spec.)
Response time (T90)*2
Applicable JIS standards

Combustible gas
Methane (CH4) or isobutane (i-C4H10)*1
NCR-6309
New ceramic type (catalytic type)0 - 100 %LEL
1 %LEL
1st alarm: 10 %LEL
2nd alarm: 50 %LEL
3rd alarm: 50 %LEL
OVER alarm: 100 %LEL
1st alarm: 10 %LEL
2nd alarm: 25 %LEL
3rd alarm: 50 %LEL
OVER alarm: 100 %LEL
Methane: Within 30 seconds, Isobutane: Within 40 seconds
JIS T 8206:2020*3*1 CH4 or i-C4H10 (HC) is set before shipping. (Specify when ordering.)*2 Test conditions: Response time with no sampling probe, normal temperature and humidity, and gas introduction at
0 seconds*3 Detection target gas: Compliant only for methane (CH4)Item

Detection target gas

Oxygen (O2)

Sensor Model
Detection principle
Display range(Japan EX spec.)
Detection range(Japan EX spec.)
Display range(ATEX/UKEX/IECEx spec.)
Detection range(ATEX/UKEX/IECEx spec.)
Resolution

ESR-X13P

Carbon monoxide (CO)Hydrogen sulfide (H2S）

0.0 - 40.0 %0.0 - 25.0 %ESR-A1DP
Electrochemical type0 - 2,000 ppm
0.0 - 200.0 ppm
0 - 500 ppm
0.0 - 30.0 ppm

0.0 - 40.0 %0 - 2,000 ppm

0.0 - 200.0 ppm

0 - 25.0 %0 - 500 ppm

0 - 100.0 ppm

0.1 %

1 ppm
1st alarm: 25 ppm
2nd alarm: 50 ppm
3rd alarm: 50 ppm
TWA alarm: 25 ppm
STEL alarm: 200 ppm
OVER alarm 2,000 ppm
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
Within 30 seconds-

0.1 ppm
1st alarm: 1.0 ppm
2nd alarm: 10.0 ppm
3rd alarm: 10.0 ppm
TWA alarm: 1.0 ppm
STEL alarm: 5.0 ppm
OVER alarm: 200.0 ppm
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
Within 30 seconds
JIS T 8205:2018

Alarm setpoints(Japan EX spec.)

L: 19.5 %LL: 18.0 %H: 25.0 %OVER alarm: 40.0 %Alarm setpoints(ATEX/UKEX/IECEx spec.)

L: 19.5 %LL: 18.0 %H: 23.5 %OVER alarm: 40.0 %Response time (T90)*4
Applicable JIS standards

Within 20 seconds
JIS T 8201:2010*4 Test conditions: Response time with no sampling probe, normal temperature and humidity, and gas introduction at
0 seconds

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10 Product Specifications

Item

Detection target gas

Sensor Model
Detection principle
Display range (Japan EX spec.)
Detection range (Japan EX spec.)
Display range(ATEX/UKEX/IECEx spec.)
Detection range(ATEX/UKEX/IECEx spec.)
Resolution

Alarm setpoints(Japan EX spec.)

Alarm setpoints(ATEX/UKEX/IECEx spec.)

Response time (T90)*4
Applicable JIS standards

10-1 Specifications list

Carbon monoxide(CO)
ESR-A13P

Carbon monoxide(CO)*5

Hydrogen sulfide (H2S）

0 - 2,000 ppm
0 - 500 ppm

ESR-A1CP
Electrochemical type0 - 2,000 ppm
0 - 500 ppm

ESR-A13i
0.0 - 200.0 ppm
0.0 - 30.0 ppm

0 - 2,000 ppm

0 - 2,000 ppm

0.0 - 200.0 ppm

0 - 500 ppm

0 - 500 ppm

0 - 100.0 ppm

1 ppm
1st alarm: 25 ppm
2nd alarm: 50 ppm
3rd alarm: 50 ppm
TWA alarm: 25 ppm
STEL alarm: 200 ppm
OVER alarm 2,000ppm
1st alarm: 25 ppm
2nd alarm 50 ppm
3rd alarm: 1,200 ppm
TWA alarm: 25 ppm
STEL alarm: 200 ppm
OVER alarm: 2,000ppm
Within 30 seconds-

1 ppm
1st alarm: 25 ppm
2nd alarm: 50 ppm
3rd alarm: 50 ppm
TWA alarm: 25 ppm
STEL alarm: 200 ppm
OVER alarm 2,000ppm
1st alarm: 25 ppm
2nd alarm 50 ppm
3rd alarm: 1,200 ppm
TWA alarm: 25 ppm
STEL alarm: 200 ppm
OVER alarm: 2,000ppm
Within 30 seconds-

0.1 ppm
1st alarm: 1.0 ppm
2nd alarm: 10.0 ppm
3rd alarm: 10.0 ppm
TWA alarm: 1.0 ppm
STEL alarm: 5.0 ppm
OVER alarm: 200.0 ppm
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
Within 30 seconds
JIS T 8205:2018*5 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 hydrogen interference and may indicate a higher carbon
monoxide concentration than actual.)

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10 Product Specifications

10-2 Accessory list
<Accessories (Japan EX specification)>
Part name
AC adapter
Tapered nozzle
Hand strap

Part No.
2594 1342 30
4126 4948 200888 0605 90* The above accessories are not included with ATEX/UKEX/IECEx specifications.

<Optional accessories>
Part name
AC adapter
Tapered nozzle
Hand strap
Belt clip (with attachment screw)
Filter unit set (for ESR-A1DP), set of 5
Filter unit set (for NCR-6309), set of 5
Filter unit set(for ESR-A1CP, ESR-A13P), set of 5
Filter unit set (for ESR- A13i), set of 5
Protective film, set of 5
Leather caseGas sampling rod
Gas sampling tube
USB cable
Two-stage sampling rod
Float-type gas collector
Filter (Teflon), set of 10
Filter (metal mesh), set of 10
Data logger management program (Japan EX specifications)
Data logger management program (ATEX/UKEX/IECEx specifications)

107 / 111

Part No.
2594 1342 30
4126 4948 200888 0605 90
4711 9954 30
4777 9314 104777 9315 904777 9316 60
4777 9317 304777 9296 50
4777 4616 100904 0275 00
0914 0100 00
2440 2728 90
4383 0730 80
4384 0430 60
4181 9573 104181 9574 90
9812 0010 109812 0020 10

11 Appendix

11-1 Data logger function

11

11

Appendix11-1 Data logger function
The product is equipped with a data logger function that records measurement results and events suchas gas alarms, fault alarms, and gas adjustment.

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, andPEAK value detection time are recorded; for oxygen, the average value, minimum value, minimum value
detection time, maximum value, and maximum value detection time are recorded.
The 3,600 most recent data items are recorded.
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:
10
20
30
3
5
1 minute
Intervalseconds
seconds
seconds
minutesminutes
180
300
Maximum
10 hours 20 hours 30 hours 60 hours
hours
hours
recording time
* The default setting for interval is five minutes.
The interval can be set using the data logger management program (sold separately).

10
minutes
600
hours(2) Alarm trend
When an alarm is triggered, this function records the changes in measured concentration for 30 minutes
before and after the alarm occurred (one hour in total).
Alarm trend records PEAK values (minimum values for oxygen) over 5-second periods at 5-second
intervals.
The eight most recent data items are recorded.
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 ofalarm event.
The 100 most recent events are recorded.
If the number of events exceeds 100, the oldest data will be overwritten by the latest data.
108 / 111

11 Appendix

11-2 Methane gas sensitivity and response when using supplied or optional sampling probes(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.
The 100 most recent events are recorded.
If the number of events exceeds 100, the oldest data will be overwritten by the latest data.

(5) Adjustment history
Records data when adjustment is performed.
The adjustment history records adjustment time, concentration values before and after adjustment, andadjustment errors.
The 100 most recent adjustment history data items are recorded.
If the number of calibrations exceeds 100, the oldest data will be overwritten by the latest data.

NOTE If a USB connection is detected while the date, battery level, or alarm pattern is displayed after the
power is turned on, the display switches to communication mode. Communication mode can also
be selected by pressing the AIR and MODE buttons together while the date, battery level, or alarm
pattern is displayed during startup.
 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.

11-2 Methane gas sensitivity and response when using
supplied or optional sampling probes
The methane gas sensitivity and response will be as follows when using the supplied or optional samplingprobes.
The test conditions for response time are normal temperature and humidity and gas introduction at
0 seconds.
Part No.

Reading*1

Response time (T90)*1-

50 %LEL

Within 30 seconds

Tapered nozzle

4126 4948 20

50 %LEL

Within 30 seconds

Gas sampling rod andgas sampling tube

0904 0275 00
0914 0100 00

50 %LEL

Within 30 seconds

Two-stage sampling rod4383 0730 80

50 %LEL

Within 30 seconds

Float-type gas collector

4384 0430 60

50 %LEL

Within 80 seconds

Accessories
No sampling probe*1 Stable value (representative value) with 50 %LEL methane introduced

109 / 111

11 Appendix

11-3 100 %LEL = ppm conversion list

11-3 100 %LEL = ppm conversion list
The following table shows the standard conversion for 100 %LEL and ppm.
The 100 %LEL values are standard values for both Japan EX and ATEX/UKEX/IECEx specifications.
Standard
Methane

CH4

IEC

ISO

*2

44,000 ppm

44,000 ppm*350,000 ppm

Isobutane

i-C4H1018,000 ppm

13,000 ppm

15,000 ppm

HydrogenH2

40,000 ppm*2

40,000 ppm

40,000 ppm*160,000 ppm

60,000 ppm*1

Methanol

CH3OH

55,000 ppm

Acetylene

C2H2

15,000 ppm

23,000 ppm

23,000 ppm

Ethylene

C2H4

27,000 ppm*2

23,000 ppm

24,000 ppm

C2H6

*2

24,000 ppm

24,000 ppm*2Ethane30,000 ppm

Ethanol

C2H5OH

33,000 ppm

31,000 ppm

31,000 ppm

Propylene

C3H6

20,000 ppm*2

20,000 ppm

18,000 ppm*1

25,000 ppm

25,000 ppm*1

Acetone

C3H6O

21,500 ppm

PropaneC3H8

20,000 ppm

17,000 ppm

17,000 ppm

Butadiene

C4H6

11,000 ppm*1

14,000 ppm

14,000 ppm

C5H10

*4

14,000 ppm

14,000 ppm*1

Cyclopentane

14,000 ppm

Benzene

C6H6

12,000 ppm

12,000 ppm

12,000 ppm

N-hexanen-C6H14

12,000 ppm*1

10,000 ppm

10,000 ppm*2

10,000 ppm

10,000 ppm*28,500 ppm

8,000 ppm

Toluene

C7H8

12,000 ppm

N-heptane

n-C7H16

11,000 ppm

XyleneC8H1010,000 ppm*2

10,000 ppm

10,000 ppm*57,000 ppm

7,000 ppm

*1

N-nonane

n-C9H20

7,000 ppm

Ethyl acetate

EtAc

21,000 ppm

20,000 ppm

20,000 ppm

Isopropyl alcohol

IPA

20,000 ppm*2

20,000 ppm

20,000 ppm*2

15,000 ppm

15,000 ppm*2

Methyl ethyl ketone

MEK

18,000 ppm

Methyl methacrylate

MMA

17,000 ppm

17,000 ppm

17,000 ppm

Dimethyl ether

DME

30,000 ppm*1

27,000 ppm

27,000 ppm

Methyl isobutyl ketone

MIBK

12,000 ppm*3

12,000 ppm

12,000 ppm*2

Tetrahydrofuran

THF

20,000 ppm

15,000 ppm

15,000 ppm

Normal pentane

n-C5H1215,000 ppm*2

11,000 ppm

11,000 ppm*1 Recommended Practices for Explosion-Protected Electrical Installations in General Industries (NIIS/1985)*2 Recommended Practices for Explosion-Protected Electrical Installations in General Industries (NIIS/2006)*3 Technical recommendations of the Research Institute of Industrial Safety (NIIS/1994)*4 Chemical Safety Management Data Book (The Chemical Daily Co., Ltd.)*5 Product Safety Data Sheet (Eishin Kagaku Co., Ltd.)110 / 111

11 Appendix

11-4 Product warranty

11-4 Product warranty
1. In the event of defects, we will repair the product at no cost for three years from the date of purchase aslong as the product has been used correctly in accordance with the operating manual, labels affixed tothe product, and other such warnings.
2. For information about repairs, maintenance, and after sales servicing, please contact Riken Keiki.
3. When on-site repairs are required at remote locations, we will request that you defray the cost of
traveling to the site.
4. Even within the warranty period, a fee will be charged for repairs in the following cases:(a) When the fault or damage is the result of erroneous operation, unwarranted repair, or modification.
(b) When faults or damages are due to the item being repaired or modified at service agencies otherthan Riken Keiki or service agencies designated by Riken Keiki.
(c) When the fault or damage is due to the item being incorrectly moved, transported, toppled,
dropped, or stored after the product was purchased.
(d) When the faults or damages are due to external factors such as; acts of providence such as fire,
earthquake, flood, lightning strikes, etc.; pollution; abnormal voltage; use of power sources outsideof rated ranges (voltage, frequency); etc.
(e) When the cause of the fault is something other than this product.
(f) Replacement of consumable parts (e.g., battery and sensors)

11-5 Sensor warranty
1. In the event of defects, we will replace at no cost for three years from the date of purchase or the dateon which the sensor was replaced for a fee, as long as the product has been used correctly inaccordance with the operating manual, labels affixed to the product, and other such warnings.
However, a condition of the sensor's warranty shall be maintenance performed at least once annuallyfrom the date of purchase or the date on which the sensor was replaced for a fee.
2. For information about repairs, maintenance, and after sales servicing, please contact Riken Keiki.
3. When on-site replacement is required at remote locations, we will request that you defray the cost of
traveling to the site.
4. Even within the warranty period, a fee will be charged for replacement in the following cases:(a) When replacement is required due to failure to comply with warnings in the operating manual,labels affixed to the product, and other such warnings.
(b) When faults or damages are due to the item being repaired or modified at service agencies otherthan Riken Keiki or service agencies designated by Riken Keiki.
(c) When the fault or damage is due to the item being incorrectly moved, transported, toppled,
dropped, or stored after the product was purchased.
(d) When the faults or damages are due to external factors such as; acts of providence such as fire,
earthquake, flood, lightning strikes, etc.; pollution; abnormal voltage; use of power sources outsideof rated ranges (voltage, frequency); etc.
(e) When the cause of the fault is something other than this product.

111 / 111

Revision history
Issue

Revision details

Issue date

0First issue2022/1/13

1

P.5 / 35 / 106 Note added

2023/3/7