PT0E-18810

Portable Gas Monitor
GW-3

Operation Manual(PT0-188)

Contents

Contents
1. Product Overview..........................................................................................................................................................4
1-1. Introduction ...........................................................................................................................................................4
1-2. Intended use .........................................................................................................................................................6
1-3. DANGER, WARNING, CAUTION, and NOTE .....................................................................................................7
1-4. Checking standards and explosion-proof specifications.......................................................................................8
2. Important Safety Information.........................................................................................................................................92-1. Danger information ...............................................................................................................................................92-2. Warning information ............................................................................................................................................ 11
2-3. Caution information ............................................................................................................................................ 14
2-4. Safety information .............................................................................................................................................. 18
3. Product Configuration ................................................................................................................................................ 21
3-1. Main unit and accessories ................................................................................................................................. 21
3-2. Part names and functions .................................................................................................................................. 23
3-2-1. Main unit .................................................................................................................................................. 23
3-2-2. LCD display ............................................................................................................................................. 24
3-3. Inserting the battery ........................................................................................................................................... 26
4. Alarm Functions ......................................................................................................................................................... 29
4-1. Gas alarm types and alarm setpoints ................................................................................................................ 29
4-2. Gas alarm activation .......................................................................................................................................... 32
4-3. Fault alarm activation ......................................................................................................................................... 34
4-4. Outside operating temperature range warning .................................................................................................. 35
5. Usage Instrucions ...................................................................................................................................................... 36
5-1. Usage note ......................................................................................................................................................... 36
5-2. Preparing startup................................................................................................................................................ 36
5-3. Turning on the power ......................................................................................................................................... 37
5-4. Performing air calibration ................................................................................................................................... 43
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Contents
5-5. Measuring gas concentration ............................................................................................................................. 46
5-6. Checking the gas concentration, alarm setpoints, etc. (display mode) ............................................................. 48
5-6-1. Procedure for displaying display mode ................................................................................................... 48
5-6-2. Items displayed in display mode ............................................................................................................. 49
5-7. Turning off the power ......................................................................................................................................... 54
6. User Mode Settings ................................................................................................................................................... 55
6-1. User mode setting procedure ............................................................................................................................ 55
6-2. User mode setting items .................................................................................................................................... 58
7. Maintenance .............................................................................................................................................................. 62
7-1. Maintenance intervals and maintenance items ................................................................................................. 62
8. Storage and Disposal................................................................................................................................................. 64
8-1. Procedures for storage or when not in use for extended periods ...................................................................... 64
8-2. Product disposal................................................................................................................................................. 65
9. Troubleshooting ......................................................................................................................................................... 66
9-1. Product abnormalities ........................................................................................................................................ 66
10. Product Specifications ............................................................................................................................................... 69
10-1. Common specifications .................................................................................................................................... 69
10-2. Specifications by model ................................................................................................................................... 70
11. Appendix .................................................................................................................................................................... 72
11-1. Limited Warranty and Limitation Liability .......................................................................................................... 72

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1. Product Overview

1-1. Introduction

1

Product Overview
1-1. Introduction
Thank you for your purchase of the GW-3 Portable Gas Monitor (“product” hereinafter).
This operating manual describes product operating procedures and specifications. It provides information essential
to correct use of the product.
Make sure you have read and fully understood the contents of this manual before using the product.
Keep this operating manual on hand to allow ready reference during use.
For more information on product maintenance and setting changes, refer to the Technical Manual available fordownload from our website.
The contents of this manual are subject to change without notice to allow product improvements.
RIKEN KEIKI accepts no liability for accidents or damage resulting from use of the product, whether within or
outside the warranty period.
Review the warranty policy indicated on the warranty.

<Checks made after purchase>
Before using the product, please confirm that the model of the product you purchased matches the model of the
product covered by this operating manual.

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1. Product Overview

1-1. Introduction

Models covered by this operating manual GW-3 (O2) ・ GW-3 (OX) ・ GW-3 (CO) ・ GW-3 (HS) ・ GW-3 (C-) ・ GW-3 (CX)

<This operating manual>In this operating manual, where descriptions differ according to the model, the following icons are used to indicate
each of the models:
GW-3 (O2)O2

GW-3 (OX)OX

GW-3 (CO)CO

GW-3 (HS)HS

GW-3 (C-)

C-

GW-3 (CX)

CX

Operating procedures and specifications for which no icons appear apply to all models.
In cases without significant differences from model to model, the display examples are taken from the GW-3 (CO)(detection target gas: CO (carbon monoxide)).
Product specifications may be abbreviated in this document as follows.
Japan Ex specification ： Japan specification
ATEX / IECEx / UKEX specifications ： Export specification

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1. Product Overview

1-2. Intended use

1-2. Intended use
The product is a portable gas monitor for personal use designed to detect gases in the surrounding atmosphere.
It measures concentrations of toxic gases and oxygen in the atmosphere and issues an alarm when gas
concentrations reach preset levels, thereby alerting users to the hazards of gas poisoning and oxygen deficiency.
The detection results are not intended to assure life or safety.
Six models are available to detect various detection target gases.
Check the specifications before use to confirm the correct gases will be detected in accordance with the intended
purpose.
<List of detection target gases by model>
Model
GW-3 (O2)
GW-3 (OX)
GW-3 (CO)GW-3 (HS)GW-3 (C-)
GW-3 (CX)

Detection target gas
Oxygen (galvanic cell type)
Oxygen (electrochemical type)
Carbon monoxide
Hydrogen sulfide
Carbon monoxide*
Carbon monoxide, oxygen*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

1-3. DANGER, WARNING, CAUTION, and NOTE

1-3. 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

1-4. Checking standards and explosion-proof specifications

1-4. Checking standards and explosion-proof specifications
The product specifications will vary depending on the specific standards and explosion-proof certification.
Check the actual product specifications before use. For CE/UKCA marking models, refer to the Declaration ofConformity at the end of this document.
For product specifications, refer to the nameplate attached to the rear of the product.

Ex mark
CE mark

Type examination
certificate marking

UKCA markTypical nameplate for models with certificate ofconformity for electrical equipment used in potentiallyexplosive atmospheres(Japanese explosion-proof standard)

Typical nameplate for ATEX/IECEx/UKEX
specification

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2. Important Safety Information

2-1. Danger information

2

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

2-1. Danger information
DANGER
Explosion-proofing Do not modify or alter the circuitry or configuration.
 When using the product in hazardous areas, take the following precautions to safeguard against static
electricity hazards:
・ Wear anti-static clothing and conductive shoes (anti-static work shoes).
・ When using the product indoors, stand on a conductive work floor (with a leakage resistance of 10 MΩ orless).
 Be sure to replace the battery in a safe place.
 The explosion-proof class of the product is Ex ia IIC T4 Ga.

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2. Important Safety Information

2-1. Danger information

 The ratings are as follows:・ Japan specification:
Power supply:
3 V DC, 1 mA (using one Murata CR2450 battery)
Ambient temperature: −20 °C to +60 °C
・ Export specification:
Power supply:
3 V DC, 1 mA (using one Murata CR2450, Sony CR2450B, or Duracell DL2450
battery)
Ambient temperature: −20 °C to +60 °C
 If the product is used as an explosion-proof device, note that the explosion-proofing rating conditions specify
the battery type to be used.
The battery types are as follows:・ Japan specification: One CR2450 (Murata)
・ Export specification: One CR2450 (Murata), CR2450B (Sony), or DL2450 (Duracell)

DANGER

O2

OX

CX

Usage
 When measuring inside manholes or enclosed spaces, never lean over or look into the manhole or enclosed
space.
Such locations may generate and discharge oxygen-deficient air or other gases.

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2. Important Safety Information

2-2. Warning information

2-2. Warning information
WARNING
Fresh air adjustment in the atmosphere When air calibration is performed in the atmosphere, check the atmosphere for freshness before starting.
The presence of interference gases will prevent proper air calibration. The presence of interference gases isalso extremely dangerous because the product may not detect actual gas leaks correctly.
Battery level check Check battery levels before using the product. The battery may become depleted if not used for extended
periods.
Always replace with a new battery before use.
The battery types are as follows:・ Japan specification: One CR2450 (Murata)
・ Export specification: One CR2450 (Murata), CR2450B (Sony), or DL2450 (Duracell) If a low battery voltage alarm occurs, gas cannot be detected. If a low battery voltage alarm occurs duringuse, turn off the power and replace the battery.
Handling the calibration gas
 The calibration gas is nitrogen and a toxic gas. Inhaling the gas may lead to loss of health or even death.
When using calibration gas, discharge outside, perform calibration in a well-ventilated area, or use local
ventilation equipment.
 For calibration, use a standard gas consisting of the detection target gas diluted with nitrogen or air.
Calibration can be performed with a gas mixture that includes other components; however, such calibrations
will result in poor sensitivity and inaccurate concentration readings.

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2. Important Safety Information

2-2. Warning information

 Never disassemble the electrochemical type sensor inside the product.
Contact with the electrolyte inside the sensor may result in skin inflammation. Contact with eyes may resultin blindness. Contact with clothing may result in discoloration or holes. If contact with electrolyte occurs,
rinse the area immediately with plenty of water.
 Do not use any gas other than nitrogen as the balance gas when calibrating or adjusting the oxygen sensor.
Miscellaneous Do not dispose of the product into fire.
 Do not 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.
 Do not remove the battery while the power is turned on.

WARNINGOXCXBattery replacement or sensor replacement
 An OVER alarm may occur if the power is turned on within 10 minutes of replacing the battery or the sensor.
This is due to the characteristics of the sensor.
If an OVER alarm occurs in fresh air after replacing the battery or the sensor, turn off the power, then turnthe power on again after waiting at least 10 minutes.

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2. Important Safety Information

WARNING

2-2. Warning information

C-

Handling the calibration gas
 The carbon monoxide sensor with hydrogen compensation must be calibrated separately for carbon
monoxide and hydrogen.
 If hydrogen sensitivity calibration is not performed, carbon monoxide readings may be inaccurate due tohydrogen interference.
 Due to the hydrogen compensation mechanism, carbon monoxide readings may increase temporarily ifhydrogen gas concentrations increase rapidly in the atmosphere being measured.

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2. Important Safety Information

2-3. Caution information

2-3. Caution information
CAUTION
Do not use the product in locations where it may be exposed to oil, chemicals, or other such
substances. Avoid deliberately submerging the product in water.
 Do not use the product in locations where it may be exposed to oil, chemicals, liquids, or other such
substances.
Do not use walkie-talkies near the product.
 The product’s functions may be affected by radio waves emitted from walkie-talkies or other radiotransmitters used nearby.
Position any transceivers or other similar devices so that they do not affect the product’s functions.
 Avoid using the product near devices that emit strong electromagnetic radiation (high frequency or highvoltage devices).
Be sure to perform regular maintenance.
 The product is a safety device. Maintain the product regularly to ensure safety.
Continuing to use the product without adequate maintenance will result in sensor sensitivity variations,preventing accurate gas detection.
Maintenance Replace filters every six months.
 Handle filters carefully. Do not use damaged filters.
Do not use the product in locations outside the operating temperature and humidity ranges.
 The operating temperature and humidity ranges for the product are as follows. Avoid using the product attemperatures or humidity levels outside the indicated operating range.
GW-3 (O2)：<Continuous use enironment> Temperature: −20 °C to +50 °C Humidity: 10 %RH to 90 %RH
GW-3 (OX), GW-3 (HS), GW-3 (CO), GW-3 (C-), GW-3 (CX)：<Continuous use environment> Temperature: −20 °C to +50 °C Humidity: 10 %RH to 90 %RH<Temporary use environment> Temperature: −20 °C to +60 °C Humidity: 0 %RH to 95 %RH
 Avoid using for extended periods in locations exposed to direct sunlight.
 Avoid storing the product inside parked vehicles in hot weather.
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2. Important Safety Information

2-3. Caution information

 Note that humidity may affect readings even when humidity is within the specified range.
Air calibration
 Air calibrate the product using fresh air at pressures, temperatures, and humidity levels similar to the actual
usage environment.
 Wait for the readout to stabilize before performing air calibration.
 If the temperature difference between the storage location and usage location is 15 °C or greater, turn on the
power, allow the product to adjust to ambient conditions similar to those at the usage location for about
several tens of minutes*1, and perform air calibration using fresh air before using the product.
Miscellaneous Pressing buttons unnecessarily may change settings and prevent alarms from activating correctly. Avoid
performing any operations not described in this technical manual.
 Do not drop the product or subject it to impact. Doing so may degrade waterproof and explosion-proof
performance or reduce sensitivity.
 Do not poke the sensor or buzzer sound opening with sharp or pointed items. Doing so may result in
malfunctions or damage to the product, preventing accurate measurements.
 The product is a precision device. Do not subject the product to strong impact or vibration.
 If the product is used in cold conditions, the intrinsic properties of the battery may cause the low battery
voltage alarm to occur sooner than usual.
When using the product at temperatures below 0 °C, confirm that the battery level icon shows at least threebars.
 Keep the product away from magnetic fields. Magnetic fields may cause the product to fail or malfunction. If
the product does not operate correctly, use it away from magnetic fields.
 Replace the batteries promptly.
If the product is stored for extended periods with the batteries removed, a [FAIL SENSOR] (sensor
abnormality) alarm may occur in rare cases when the power is turned on. If this occurs, wait several
minutes*2 before turning the power back on.
Battery replacement
 Be sure to turn off the power for the product when replacing the batteries.
 Always replace the batteries with new batteries.
 Note the polarity when inserting the batteries.
 Do not use any batteries other than the types specified.
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2. Important Safety Information

2-3. Caution information

 Be sure to replace the batteries in a safe place.
Storage If the product will not be used for extended periods, store with the batteries removed. Battery leaks may
result in fire or injury.
*1 GW-3 (O2): 30 minutes/GW-3 (OX), GW-3 (HS), GW-3 (CO), GW-3 (C-), and GW-3 (CX): 10 minutes*2 GW-3 (O2), GW-3 (HS), GW-3 (CO), GW-3 (C-): 5 minutes/GW-3 (OX), GW-3 (CX): 10 minutes

CAUTION

OX

CO

HS

C-

CX

Gas alarm activation
 If the sensor has been exposed to high concentrations of gas (including the detection target gas orinterference gas), it may take several minutes, or even several hours, for the display readout to return to[0 ppm] ([20.9 %] for oxygen). (For example, high concentrations of hydrogen, unsaturated hydrocarbons,
alcohol, etc.)

CAUTIONOX

CXOxygen sensor
 Do not expose the product to sudden pressure fluctuations. Oxygen readings will fluctuate briefly, preventing
accurate measurement.
 Do not use any gas other than nitrogen as the balance gas. Otherwise, oxygen reading errors will increase,preventing accurate measurement.

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2. Important Safety Information

CAUTION

2-3. Caution informationC-

Calibration
 Calibration of hydrogen gas may become impossible when the product is used or stored for extended
periods in dry environments.
If [FAIL A-CAL] (calibration abnormality) appears during hydrogen sensitivity calibration, leave the productovernight or longer in a location with sufficient humidity, then perform calibration once again. If it is notpossible to perform CO sensitivity calibration, contact RIKEN KEIKI to request sensor replacement.

CAUTIONCX Avoid using the product continuously for extended periods (one day or longer) under a low temperatureenvironment (below −20 C) or storing it under such environment.

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2. Important Safety Information

2-4. Safety information

2-4. Safety information
This gas monitor is portable and is available as a single-gas monitor or a two-gas monitor.
A single CR2450 button-type lithium battery is used for power supply. Replace the battery in a safe place.

<Specification for safety>
 Ex ia IIC T4 Ga


II 1G Ex ia IIC T4 Ga

 Ambient temperature range: −20 °C to +60 °C<Electrical data> Powered by one CR2450 lithium manganse dioxide battery (CR2450 by Murata, CR2450B by Sony, or DL2450
by Duracell)(Only CR2450 by Murata can be used for Japan Ex specification.)<Certificate numbers>
 IECEx Certificate number: ATEX Certificate number: UKEX Certificate number:

IECEx DEK 18.0082
DEKRA 18 ATEX 0130
DEKRA 21 UKEX 0358

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2. Important Safety Information

2-4. Safety information<List of standards>
 IEC 60079-0:2017
 IEC 60079-11:2011

・ EN IEC 60079-0:2018
・ EN 60079-11:2012<Guidelines> JNIOSH-TR-46-1:2015
 JNIOSH-TR-46-6:2015

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・ BS EN IEC 60079-0:2018
・ BS EN 60079-11:2012

2. Important Safety Information

2-4. Safety information

WARNING Do not replace batteries in hazardous location.
 Do not disassemble or alter the product.
 Use only one CR2450 lithium manganse dioxide battery by Murata, CR2450B by Sony, or DL2450 byDuracell (CR2450 by Murata only for Japan Ex specification).
Note the following:・ Only CR2450 batteries can be used.

INST. No. 0 0 0 0 0 0 0 0 0 0 0
AB

C

D

E

A: Manufacturing year (0-9)
B: Manufacturing month (1-9, XYZ for Oct.-Dec.)
C: Manufacturing lot
D: Serial number
E: Code of factory

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

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3. Product Configuration

3-1. Main unit and accessories

3

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

<Main unit and standard accessories>
Main unit
CR2450 battery:×1 (fitted)

Watch band: ×1
Japan specification(except for GW-3 (CX))

Standard accessories
Spring bar:×2 (fitted)
Product warranty:
×1
Belt clip: ×1
Japan specification(except for GW-3 (CX))

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Alligator clip: ×1
Export specification

Operating manual:
×1
Heat-resistant case: ×1
Japan specification(GW-3 (CX) only)3. Product Configuration

3-1. Main unit and accessories<Optional items (sold separately)> Dust filter Filters
GW-3 (OX), GW-3 (HS): Humidity control filter CF-A13i-1
GW-3 (CO), GW-3 (C-), GW-3 (CX) : Interference gas removal filter CF-6280
 Leather case
 Heat-resistant case Arm band (belt)
 Calibration adapter
 Data logger management program

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3. Product Configuration

3-2. Part names and functions

3-2. Part names and functions
3-2-1. Main unit
① Alarm lamp/
Infraredcommunication port
② Buzzer soundopening⑦ Battery coverBattery coverretaining screw⑥ Sensor③ LCD display④ AIR button⑤ POWER/MODE button

Sensor cap
Sensor cap
retaining screw

No.

Name

Function①

Alarm lamp/
Infrared communication
portFlashes red when an alarm occurs.
This is used for data communication with a PC when using the data logger
management program (sold separately).

②

Buzzer sound opening

Opening that emits operating and alarm sounds. Blocking the buzzer soundopening will muffle or silence the audible warning.

③

LCD display

Displays the detection target gas name, gas concentration, battery level, etc.

④

AIR button

Performs air calibration in measurement mode. Used to select functions whenin user mode, etc.
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3. Product Configuration

3-2. Part names and functions

No.

Name

Function⑤

POWER/MODE button

Turns the power on/off. Confirms operations when in user mode, etc.

⑥

Sensor

The sensor for detecting gas is installed.

⑦

Battery cover

Cover protecting the battery* The data logger management program is sold separately. For more information, refer to the operating manual for the data logger
management program.

3-2-2. LCD display① Gas name/concentration
display② Battery level icon
③ Operating status display④ Information display

No.

Name

Function①

Gas name/
concentration display

Displays the detection target gas name and gas concentration.

②

Battery level icon

Indicates battery levels.

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3. Product ConfigurationNo.

3-2. Part names and functions

Name

Function③

Indicates the operating status in measurement mode.
Blinks when normal. The blinking interval changes from approximately once
Operating status display
every second to approximately once every two seconds if no operation is
performed for about 30 seconds.

④

Information display

Displays various information.

NOTE
 The following is a guide to battery levels:: Sufficient /: Low /
: Replace the battery.
The battery level icon will blink ( ) if battery levels drop even further.
 If the bump test expiration setting is ON, [✔] will appear in the lower left of the LCD if the bump test
expiration date has not passed. (Refer to ‘6-4-2. Bump test expiration ON/OFF (BP.RMDR)’ in the Technical
Manual.)25 / 73

3. Product Configuration

3-3. Inserting the battery

3-3. Inserting the battery
When using the product for the first time or when battery levels are low, install a new (CR2450) battery.
1 Confirm that the power for the product isturned off.
If the power is on, hold down the POWER/MODE
button for at least three seconds to turn off thepower.
Battery cover retaining screw

2 Use a Phillips-head screwdriver to loosen thebattery cover retaining screw, then open thebattery cover.

Battery cover

3 Remove the old battery, then insert a newbattery noting the polarity.
Insert the battery by matching the polarity
markings inside the product.
Battery

4 Close the battery cover, then tighten thebattery cover retaining screw with thePhillips-head screwdriver.
Tighten the screws to a torque of 15 to 16 N∙cm
with the Phillips-head screwdriver.

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3. Product Configuration

3-3. Inserting the battery

DANGER If the product is used as an explosion-proof device, note that the explosion-proofing rating conditions specify
the battery type to be used.
The battery types are as follows:・ Japan specification: One CR2450 (Murata)
・ Export specification: One CR2450 (Murata), CR2450B (Sony), or DL2450 (Duracell)

WARNINGOXCX An OVER alarm may occur if the power is turned on within 10 minutes of replacing the battery or the sensor.
This is due to the characteristics of the sensor. If an OVER alarm occurs in fresh air after replacing thebattery or the sensor, turn off the power, then turn the power on again after waiting at least 10 minutes.

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3. Product Configuration

3-3. Inserting the battery

CAUTION Be sure to turn off the power for the product before replacing the battery.
 When replacing the battery, always replace with a new battery.
 Note the polarity when inserting a battery.
 Do not use any batteries other than the types specified.
 Be sure to replace the battery in a safe place.
 The date and time setting screen will appear in the following cases. Set the date and time referring to‘6-12. Date and time setting (DATE)’ in the Technical Manual.
・ When the battery is first inserted・ When the battery is inserted after the product has been left for five minutes or longer without a battery
when replacing the battery, etc.
・ When you have tried to turn the power on while the battery has been inserted with the wrong polarity
・ When a button is pressed without a battery when replacing the battery, etc.

CAUTION

O2

CO

HS

C-

 The sensor will take about five minutes to stabilize after the battery is replaced. After replacing the battery,
wait at least five minutes before using the product.

CAUTIONOX

CX The sensor will take about 10 minutes to stabilize after the battery is replaced. After replacing the battery,
wait at least 10 minutes before using the product.

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4. Alarm Functions

4-1. Gas alarm types and alarm setpoints

4

Alarm Functions
4-1. Gas alarm types and alarm setpoints
O2

OX

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), and OVER
alarm (OVER).
Alarm type
Targetgas name

OxygenFirst alarm(WARNING)

Second alarm(ALARM)

Third alarm(ALARM H)

OVER alarm(OVER)

18.0 %

18.0 %

25.0 %

40.0 %

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4. Alarm Functions
CO

4-1. Gas alarm types and alarm setpoints

C-

A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in
the following table. (Japan specification: Auto reset/Export specification: Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), integrated alarm (A-1H) or TWA alarm (TWA)*, and OVER alarm (OVER).
SecondThird alarm STEL alarm
Alarm type
alarm
(ALARM H)(STEL)(ALARM)
50 ppm
150 ppm
150 ppm
200 ppm
Japan
Target Carbon
gas name monoxide Export
25 ppm50 ppm 1,200 ppm 200 ppm*Japan specification: Integrated alarm/Export specification: TWA alarmFirst alarm(WARNING)

Integrated
alarm(A-1H)
150 ppm-

TWA alarm(TWA)

OVER alarm(OVER)

25 ppm

2,000 ppm
2,000 ppm

HS
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), STEL alarm(STEL), TWA alarm (TWA), and OVER alarm (OVER).
First alarm(WARNING)

Alarm type
Target Hydrogengas name sulfide

Japan
Export1.0 ppm
5.0 ppm

Secondalarm(ALARM)
10.0 ppm
30.0 ppm

Third alarm(ALARM H)

STEL alarm(STEL)TWA alarm(TWA)

OVER alarm(OVER)

10.0 ppm
100.0 ppm

5.0 ppm
5.0 ppm

1.0 ppm
1.0 ppm

200.0 ppm
200.0 ppm

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4. Alarm Functions

4-1. Gas alarm types and alarm setpoints

CX
A gas alarm is triggered if the concentration of the detected gas reaches or exceeds the alarm setpoints shown in
the following table. (Japan specification: Auto reset/Export specification: Self-latching)Gas alarm types include the first alarm (WARNING), second alarm (ALARM), third alarm (ALARM H), STEL alarm(STEL), integrated alarm (A-1H) or TWA alarm (TWA)*, and OVER alarm (OVER).
Alarm typeFirst alarm(WARNING)

Secondalarm(ALARM)

Third alarm(ALARM H)

STEL alarm(STEL)

Carbon50 ppm
150 ppm
150 ppm
200 ppmmonoxide Japan
18.0 %
18.0 %
25.0 %
Target Oxygengas name Carbon
25 ppm50 ppm 1,200 ppm 200 ppm
monoxide Export
18.0 %
18.0 %
25.0 %
Oxygen* Japan specification: Integrated alarm/Export specification: TWA alarm

Integrated
alarm(A-1H)TWA alarm(TWA)

OVER alarm(OVER)

150 ppm-

2,000 ppm--

40.0 %-

25 ppm

2,000 ppm--

40.0 %NOTE
 The default settings for gas alarm setpoints are as shown in the tables above.
 The setting values for the alarm setpoints can be changed. (Refer to ‘6-5. Alarm setpoint setting(ALARM-P)’ in the Technical Manual.)

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4. Alarm Functions

4-2. Gas alarm activation

4-2. Gas alarm activation<Buzzer and alarm lamp patterns>
When a gas alarm occurs, the user will be alerted by the audible buzzer, flashing alarm lamp, and vibration.
The behavior differs depending on the type of alarm.
Alarm
type

BuzzerAlarm
lamp

Vibration

First alarm(WARNING)

Secondalarm(ALARM)

Repeatedalternatingstrong and weak
beeps at about
1-second
intervals: “Beep,
beep”

Repeatedalternatingstrong and weak
blips at about
0.5-second
intervals: “Blip,
blip, blip, blip”

Third alarm STEL alarm(ALARM H)(STEL)
Repeatedalternatingstrong and weak
blips at about
0.5-second
intervals: “Blip,
blip, blip, blip”

Repeatedalternatingstrong and weak
beeps at about
1-second
intervals: “Beep,
beep”

Integrated
alarm(A-1H)

Repeatedalternatingstrong and weak
blips at about
1-second and
0.5-second
intervals: “Beep,
beep”
Repeated
Repeated
Repeated
Repeated
Repeated
flashing at about flashing at about flashing at about flashing at about alternating
1-second
0.5-second
0.5-second
1-second
flashing at about
intervals
intervals
intervals
intervals
1-second and
0.5-second
intervals
The product will vibrate when an alarm occurs.

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TWA alarm(TWA)

OVER alarm(OVER)

Repeatedalternatingstrong and weak
beeps at about
1-second
intervals: “Beep,
beep”

Repeatedalternatingstrong and weak
blips at about
0.5-second
intervals: “Blip,
blip, blip, blip”

Repeated
flashing at about
1-second
intervals

Repeated
flashing at about
0.5-second
intervals

4. Alarm Functions

4-2. Gas alarm activation<Gas alarm display>
When a gas alarm occurs, the alarm type isindicated on the LCD display and the corresponding
gas concentration display blinks.

Display example: Carbon monoxide (CO) concentration: 200 ppm
when the third alarm is triggered

NOTE If the gas detection range is exceeded (over scale), [OVER] appears on the LCD display, and [∩∩∩∩] will
blink in the gas concentration display area.

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

NOTE
 The alarm pattern can be checked in the alarm setpoint display in display mode. Note, however, that thegas concentration display will not blink in alarm tests. (Refer to ‘7-4. Performing alarm tests’ in the Technical
Manual.) Press the POWER/MODE button to reset the gas alarm.

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4. Alarm Functions

4-3. Fault alarm activation

4-3. Fault alarm activation
A fault alarm is triggered if an abnormality is detected in the product.
Fault alarm types include system, battery voltage, clock, sensor, and calibration abnormalities.

CAUTION 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.
In the event of a fault alarm, the user will be alerted by the audible buzzer and flashing alarm lamp.
Alarm type
BuzzerAlarm lamp

Fault alarm

M OVER alarm (M OVER)

Repeated intermittent beeps at about 1-second intervals:“Beep-beep, beep-beep”
Repeated flashing at about 1-second intervals

Repeated intermittent beeps at about 1-second intervals:“Beep-beep, beep-beep”
Repeated flashing at about 1-second intervals

LCD display
Display example: System abnormality

Display example: M OVER alarm

NOTE
 For more information on malfunctions (error messages), see ‘9. Troubleshooting’.
 The M OVER alarm (minus sensor failure) is an alarm triggered if the zero point falls below the minus side.
 Press the POWER/MODE button to reset the alarm.
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4. Alarm Functions

4-4. Outside operating temperature range warning

4-4. Outside operating temperature range warning
If the product (other than the GW-3 (O2)) is used for 20 minutes or longer outside the operating temperature range,
an outside operating temperature range warning (temperature range error) occures.
When a temperature range error occurs, either leave the product for five minutes or longer in the operating
temperature range, or turn off the power of the main unit.
If an outside operating temperature range warning occurs, the user will be alerted by the audible buzzer andflashing alarm lamp.
Alarm type
BuzzerAlarm lamp

Outside operating temperature range warning
Repeated intermittent beeps at about 1-second intervals: “Beep”
Repeated flashing at about 1-second intervals

LCD display

Display example: Outside operating temperature range warning

NOTE
 Press the POWER/MODE button to reset the alarm.
 The outside operating temperature range warning does not apply to the GW-3 (O2).

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5. Usage Instrucions

5-1. Usage note

5

Usage Instrucions
5-1. Usage note
Observe all usage precautions when using the product.
Failure to comply with these precautions may result in failure of the product or inability to perform normal gas
measurement.

5-2. Preparing startup
Check the following before starting gas detection:
 Confirm that the protective film on the LCD display has been removed.
 Confirm adequate battery levels.
 Confirm that the filters inside the product are neither contaminated nor clogged.

WARNING Protective film is attached to the LCD display of the product at the time of shipping to protect it against
scratching.
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 Instrucions

5-3. Turning on the power

5-3. Turning on the power
Turn the power on and start the product.
When the power is turned on, various information, including date and time and alarm setpoints, will be displayed
in sequence, followed by the measurement mode screen.
1 Hold down the POWER/MODE button (for at least three seconds).
The alarm lamp lights up, and the buzzer blips once.
When the power is turned on, the entire LCD display lights up. The display changes automatically, as shown
below.
O2OX(Startup time: approx. 20 seconds)

Entire LCD
display lights up.

Calibration
notification*

Date and time

The buzzer blips
once, and thepower turns on.

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Battery level/alarm pattern

Detection target
gas name5. Usage Instrucions

5-3. Turning on the power
First gas alarm
setpoint

Full scale

Second gas
alarm setpoint

Third gas alarm
setpoint

Measurement
mode

The buzzer blips
twice, and the
product switches
to measurement
mode.
*Japan specification: Calibration notification display/Export specification: Calibration expiration display
COHS

Entire LCD
display lights up.

C-(Startup time: approx. 20 seconds) (Display example: GW-3 (CO))

Calibration
notification*1

Date and time

The buzzer blips
once, and thepower turns on.

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Battery level/alarm pattern

Detection target
gas name5. Usage Instrucions

5-3. Turning on the power

Full scaleFirst gas alarm
setpoint

Integrated/TWA
alarm setpoint*2

Measurement
mode

Second gas
alarm setpoint

Third gas alarm
setpoint

STEL alarm
setpoint

The buzzer blips
twice, and the
product switches
to measurementmode.
*1 Japan specification: Calibration notification display/Export specification: Calibration expiration display*2 GW-3 (HS): TWA alarm setpoint
GW-3 (CO), GW-3 (C-): Japan specification: Integrated alarm setpoint/Export specification: TWA alarm
setpoint

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5. Usage Instrucions
CX

5-3. Turning on the power(Startup time: approx. 20 seconds)

Calibration
notification*1

Date and time

Battery level/alarm pattern

Detection target
gas name

Full scaleFirst gas alarm
setpoint

Second gas
alarm setpoint

Third gas alarm
setpoint

STEL alarm
setpoint

Integrated alarm
setpoint*2

Measurement
mode

Entire LCD
display lights up.

The buzzer blips once,
and the power turns on.

The buzzer blips twice,
and the product switches
to measurement mode.
*1 Japan specification: Calibration notification display/Export specification: Calibration expiration display*2 Japan specification: Integrated alarm setpoint/Export specification: TWA alarm setpoint
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5. Usage Instrucions

5-3. Turning on the power<Basic operation flow>
After turning on the power, the product performs as follows when you press the AIR button or the POWER/MODE
button.
O2OXCO<Air calibration>

Hold
down
AIR
button.

POWER/
MODE
button<Gas alarm state>

C-<Air calibration><Display mode><Measurement
mode>

HS

POWER/
MODE
buttonHold down
AIR button.

POWER/
MODE
button<Gas alarm state>

41 / 73<Display mode><Measurement
mode>

POWER/
MODE
button<Fault alarm state>(Display example:
GW-3 (CO))

POWER/
MODE
buttonPOWER/
MODE
button<Fault alarm state>5. Usage Instrucions

5-3. Turning on the power

CX<Air calibration>

Hold down
AIR button.

<Display mode><Measurement
mode>

POWER/
MODE
button<Gas alarm state>

POWER/
MODE
buttonPOWER/
MODE
button<Fault alarm state>

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5. Usage Instrucions

5-4. Performing air calibration

5-4. Performing air calibration
Perform air calibration before measuring gas concentration.
Air calibration refers to zero adjustment required to ensure accurate measurement of gas concentrations.

WARNING When air calibration is performed in the atmosphere, check the atmosphere for freshness before starting.
The presence of interference gases will prevent proper air calibration. The presence of interference gases isalso extremely dangerous because the product may not detect actual gas leaks correctly.

CAUTION

OX

CO

HS

C-

CX

 Perform air calibration in an environment that meets all of the following conditions:・ Pressures, temperatures, and humidity levels are similar to pressures, temperatures, and humidity levels in
the actual usage environment.
・ In fresh air
 Wait for the readout to stabilize before performing air calibration.
 If the temperature difference between the storage location and usage location is 15 °C or greater, turn on the
power and allow the product to adjust to ambient conditions similar to those at the usage location for about
10 minutes. After this, air calibrate in fresh air before use.

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5. Usage Instrucions

CAUTION5-4. Performing air calibration

O2

 Perform air calibration in an environment that meets all of the following conditions:・ Pressures, temperatures, and humidity levels are similar to pressures, temperatures, and humidity levels in
the actual usage environment.
・ In fresh air
 Wait for the readout to stabilize before performing air calibration.
 If the temperature difference between the storage location and usage location is 15 °C or greater, turn on the
power and allow the product to adjust to ambient conditions similar to those at the usage location for about
30 minutes. After this, air calibrate in fresh air before use.

1 Hold down the AIR button in measurement
mode.
The buzzer blips once, and air calibration starts.

2 Release the AIR button once the LCD display
changes from [Air HOLD] to [AdJ RELEASE].

The display automatically returns to measurementmode once air calibration has been successfullycompleted.
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5. Usage Instrucions

5-4. Performing air calibration

NOTE If air calibration fails, [FAIL AIR] will appear. Air calibration will not be performed.
Press the POWER/MODE button to reset the fault alarm (calibration abnormality). Resetting the alarm
displays the value before air calibration.
 If the quick calibration function is enabled, you can perform quick calibration after successful air calibration
in measurement mode. To perform quick calibration, hold down the AIR button and release the AIR button
when [E-CAL] appears. (Refer to ‘6-11. Quick calibration time setting (E-CAL)’ in the Technical Manual.)

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5. Usage Instrucions

5-5. Measuring gas concentration

5-5. Measuring gas concentration
The display automatically returns to measurement mode once air calibration has been successfully completed tomeasure the gas concentration.
The gas concentration will appear on the LCD display when measurement is complete.
If the gas concentration detected reaches the alarm setpoint at this time, a gas alarm is triggered. (Refer to‘4-2. Gas alarm activation’.)O2OX

O2 (oxygen) gas
concentration
display

CO

HS

C-

CO (carbon monoxide) gas
concentration display

CX

Upper row: CO(carbon monoxide) gas
concentration display
Middle row: O2 (oxygen)gas concentration display

WARNING A gas alarm indicates the presence of extreme danger. The user must take appropriate action after taking
appropriate steps to ensure safety.
 Do not block the buzzer sound opening. Doing so will muffle or silence the audible warning.

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5. Usage Instrucions

CAUTION5-5. Measuring gas concentration

CX The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce interference due tohydrogen. This function works for hydrogen concentrations up to 2,000 ppm. However, if used in anenvironment exceeding 40°C for more than 15 minutes, it may be affected by hydrogen interference andmay indicate a higher carbon monoxide concentration than actual.
 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. While measurement can continue,
errors will arise with carbon monoxide concentration readings due to the significant effects of hydrogeninterference.

NOTE
 When the confirmation beep has been set, the buzzer sounds at the set interval during measurement.
(Refer to ‘6-7. Confirmation beep setting (BEEP)’ in the Technical Manual.) The gas concentration alarm setpoints can be checked in display mode. (Refer to ‘5-6. Checking the gas
concentration, alarm setpoints, etc. (display mode).) The LCD backlight lights up when you press the POWER/MODE button or the AIR button. The LCD
backlight will go out after about 30 seconds if no operation is performed. Thirty seconds is the default
setting. Change the default settings in user mode. (Refer to ‘6-8. LCD lighting time setting (BL TIME)’ in theTechnical Manual.) The LCD backlight turns on automatically if an alarm is triggered.

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5. Usage Instrucions

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)
Check measurement results.
Switch to display mode to check items like maximum concentration of gas detected, alarm setpoints, date andtime, and temperature. You can also adjust the buzzer volume.

5-6-1. Procedure for displaying display mode
1 Press the POWER/MODE button inmeasurement mode.
The buzzer blips once, and the product switches
to display mode.

2 Press the POWER/MODE button to cycle
through the items displayed.
Pressing the POWER/MODE button cycles
through the displayed items.

Press the POWER/MODE button in the buzzer
volume setting screen to end display mode andreturn to measurement mode.

Display example:
With date andtime display
selected

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5. Usage Instrucions

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)

NOTE The product returns automatically to measurement mode if no button operations occur for about
20 seconds.
 When display mode item display setting (DISP.SET) is OFF, the buzzer volume setting is not displayed. To
end display mode, press the POWER/MODE button in the alarm setpoint display screen. (Refer to‘6-10. Display mode item display ON/OFF (DISP.SET)’ in the Technical Manual.)

5-6-2. Items displayed in display mode
Display item

LCD display

Display contents

CO
O2

HS

OX

C(Display example:
GW-3 (CO))

CX

Detection
target gas
display―

Displays the name of the detection targetgas.
[CO] (carbon monoxide) is displayed in theupper row. [O2] (oxygen) is displayed in the
middle row.

―

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5. Usage Instrucions

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)PEAK
display(Lower limit
value)――

PEAK
display(Upper limit
value)

Displays the minimum gas concentration
detected since the power was turned on.
You can clear the PEAK value (lower limit
value) while the PEAK display (lower limit
value) is on by holding down the AIR button
until [RELEASE] appears.

Displays the maximum gas concentration
detected (minimum oxygen concentration
detected for GW-3 (CX)) since the power was
turned on.
You can clear the PEAK value (upper limit
value) while the PEAK display (upper limit
value) is on by holding down the AIR button
until [RELEASE] appears.
(Display example: GW-3 (O2))

STEL
display

The time-weighted average for gas
concentration over 15 minutes. The value isrefreshed every 60 seconds.

―

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5. Usage Instrucions

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)
Displays the integrated gas concentration
value or TWA value*.
The integrated value (A-1H) is the timeweighted average for gas concentration over
one hour.
The TWA value (TWA) is the time-weighted
average of the gas concentration over 8
hours per day or 40 hours per week. The
value is refreshed every 60 seconds.

Integrated
display or
TWA display―* GW-3 (HS):TWA display* GW-3 (CO), GW-3 (C-), GW-3 (CX):
Japan specification: Integrated (A-1H)
display/Export specification: TWA display
Displays the current time and date.
Display example: January 1, 2019, 10:38

Date andtime display

Displays the current temperature.
The temperature indicated by thetemperature display corresponds to theinternal temperature of the product. Thisvalue differs from the actual ambient
temperature.
Display example: 24 degrees

Temperature
display

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5. Usage Instrucions

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)
Displays alarm setpoints. Pressing the AIR
button lets you change the alarm setpoint
display.

Alarm
setpoint
display[GW-3 (O2), GW-3 (OX)]
Pressing the AIR button cycles through thesettings in the following order: [F.S.] (FULLSCALE) → [WARNING] → [ALARM] →[ALARM H].

[GW-3(CO), GW-3(HS), GW-3(C-)]
Pressing the AIR button cycles through thesettings in the following order: [F.S.] (FULLSCALE) → [WARNING] → [ALARM] →[ALARM H] → [STEL] → [A-1H] or [TWA]*.

* GW-3 (HS): TWA display* GW-3 (CO), GW-3 (C-):
Japan specification: Integrated (A-1H)
display/Export specification: TWA display
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5. Usage Instrucions

5-6. Checking the gas concentration, alarm setpoints, etc. (display mode)[GW-3 (CX)]
Pressing the AIR button cycles through thesettings in the following order: [F.S.] (FULLSCALE) → [WARNING] → [ALARM] →[ALARM H] → [STEL] → [A-1H] or [TWA]*.

* Japan specification: Integrated (A-1H)
display/Export specification: TWA display
Displays the buzzer volume. Pressing the
AIR button lets you change the buzzer
volume.
Pressing AIR button toggles the setting
between [LO] (soft) and [HI] (loud).

Buzzervolumesetting

NOTE By pressing the AIR button and the POWER/MODE button at the same time while displaying any of thealarm setpoints in the alarm setpoint display of display mode, you can test the relevant alarm. (Refer to‘7-4. Performing alarm tests’ in the Technical Manual.)

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5. Usage Instrucions

5-7. Turning off the power

5-7. Turning off the power
CAUTION If the concentration display does not return to [0ppm] (or [20.9%] for oxygen) when you turn the power off,
allow the product to stand in fresh air. Confirm that the display returns to [0ppm] (or [20.9%] for oxygen)
before turning the power off.

1 Hold down the POWER/MODE button (for atleast three seconds).
Hold down until the buzzer blips three times.
[OFF] appears on the LCD, and the power turns
off.

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6. User Mode Settings

6-1. User mode setting procedure

6

User Mode Settings
6-1. User mode setting procedure
Set the date and time, alarm setpoints, and other settings in user mode.

<Displaying user mode setting screen>
Select the setting item in the user mode menu, then make the settings in the setting screen displayed.
1 Turn off the power.
Hold down the POWER/MODE button for at least
three seconds to turn off the power.
2 Hold down the AIR button and the
POWER/MODE button at the same time, thenrelease them when the buzzer blips once.
The entire LCD display lights up, and the user
mode menu appears.

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6. User Mode Settings

6-1. User mode setting procedure

A password input screen will appear if the user
mode password has been set.
Press the AIR button to enter the password, thenpress the POWER/MODE button to display theuser mode menu.
3 Press the AIR button several times to selectthe setting item.
Pressing AIR button cycles through user modemenu screens.
For information on user mode setting items, see‘6-2. User mode setting items’.

Display example: With date
and time setting (DATE)
selected

4 Press the POWER/MODE button.
The setting screen will appear.
Make the settings in each of the setting screens.

NOTE To display the user mode menu while configuring settings, hold down the AIR button and the
POWER/MODE button at the same time.
 The user mode password is the four-digit number set in user mode password setting (PASS-W). For
information on the user mode password, see ‘6-13. User mode password setting (PASS-W)’ in theTechnical Manual.

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6. User Mode Settings

6-1. User mode setting procedure<Ending user mode>
1 When the settings are complete, press the AIR
button several times to select [START], thenpress the POWER/MODE button.
User mode ends. The product will return tomeasurement mode after performing the same
operation as when the power is turned on.

WARNING Be sure to return to measurement mode after user mode settings are complete. The product will not returnautomatically to measurement mode if left in user mode.

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6. User Mode Settings

6-2. User mode setting items

6-2. User mode setting items
The following items can be set in user mode:
Item

LCD display

Details

Bump test (BUMP)

Perform a bump test (function check).
The bump test is a test for checking whether the readings are within
the acceptable range by introducing a calibration gas.
For information on the bump test procedure, see ‘7-3. Performing
bump tests’ in the Technical Manual.

Calibration(GAS CAL)

Perform air calibration and AUTO calibration.
For information on the calibration procedure, see ‘7-2. Performing
calibration’ in the Technical Manual.

Calibration
expiration setting(CAL SET)

Toggle the calibration expiration for AUTO calibration ON/OFF, set
the number of days for calibration expiration, and set the operation
after calibration date expires.
*Settings available on ATEX/IECEx/UKEX specification only

Bump test expiration
setting (BUMP.SET)

Set the various conditions for bump testing, toggle the bump test
expiration ON/OFF, set the bump test expiration date interval, andset the behavior after bump test expiration.

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6. User Mode Settings
Alarm setpoint
setting (ALARM-P)

6-2. User mode setting items
Set alarm setpoints*1. You can also return the alarm setpoints to theirdefault settings.
*1 The following alarm setpoints can be set:
・ GW-3 (O2), GW-3 (OX): First to third alarm setpoints
・ GW-3 (CO), GW-3 (C-), GW-3 (CX):
First to third alarm setpoints, STEL
alarm setpoint, integrated alarm
setpoint or TWA alarm setpoint*2
・ GW-3 (HS):First to third alarm setpoints, STEL
alarm setpoint, TWA alarm setpoint*2 Japan specification: Integrated alarm setpoint/
Export specification: TWA alarm setpoint

Lunch break
ON/OFF(LUNCH)

Set the lunch break setting to ON/OFF.
The lunch break function retains the gas concentration values*1 fromthe last time the power was turned off and loads them to resume
measurement the next time the power is turned on.
*1 The retained gas concentration values are as follows:
・ GW-3 (O2), GW-3 (OX): PEAK value
・ GW-3 (CO), GW-3 (C-), GW-3 (CX):
Integrated value or TWA value*2, PEAK
value
・ GW-3 (HS):TWA value, PEAK value*2 Japan specification: Integrated value/
Export specification: TWA value

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6. User Mode Settings

6-2. User mode setting items

Confirmation beep
setting(BEEP)

Toggle the confirmation beep ON/OFF, set its behavior, and set
intervals.
This function provides an audible indication of whether the product is
operating normally.
If the bump test expiration setting (BP.RMDR) or the calibration
expiration setting (CAL.RMDR) is ON, you can have this function
operate when the expiration date is reached.

LCD lighting time
setting(BL TIME)

Set how long the LCD backlight remains on.

Key operation tone
ON/OFF(KEY.TONE)

Set the key operation tone ON/OFF.

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

Set the display ON/OFF for the items that can be set in display mode(buzzer volume setting).

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6. User Mode Settings

6-2. User mode setting items

Quick calibration
time setting(E-CAL)Set the time for quick calibration.
The quick calibration function performs AUTO calibration after the
introduction of the calibration gas by automatically counting down
the calibration time set with the quick calibration time setting(E-CAL).

Date and time
setting (DATE)

Set the date and time for the internal clock.

User mode
User mode
password setting(PASS-W)

Set a password when transitioning to user mode.
Set a password between 0000 and 9999.

ROM/SUM display(ROM/SUM)

This displays the program number and SUM value of the product.
This is normally not set or adjusted by the user.

Measurement start(START)

Return to measurement mode.

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7. Maintenance7-1. Maintenance intervals and maintenance items

7

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

7-1. Maintenance intervals and maintenance items
Maintain the following items at regular intervals:
 Daily maintenance:
Perform maintenance before commencing work.
 Monthly maintenance: Perform alarm tests monthly. (Refer to ‘7-4. Performing alarm tests’ in the Technical
Manual.) Regular maintenance: Perform maintenance at least once a year (ideally, at least once every six months).
Maintenance
item

Maintenance details

Daily
Monthly
Regularmaintenance maintenance maintenanceBattery level Check to confirm that battery levels are adequate.







Check to confirm that the concentration readout is [0ppm] ([20.9%]
Concentration for oxygen) by measuring fresh air.
display
If the readout is not [0ppm] ([20.9%] for oxygen), check to confirm
that no interference gases are present, then perform air calibration.







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7. Maintenance7-1. Maintenance intervals and maintenance items

Maintenance
item
Main unit
operation

Maintenance details

Daily
Monthly
Regularmaintenance maintenance maintenanceCheck to confirm that no fault alarm is displayed on the LCD
display.

Check to confirm that the filters are not dirty.







Alarm test

Perform an alarm test. Check to confirm that the alarm lamp,
buzzer, and vibration are functioning correctly.

―





Calibration

Perform calibration using a calibration gas.

―

―



Gas alarm
check

Check the gas alarm using a calibration gas.

―

―



Filters

WARNING If you encounter a product abnormality, contact RIKEN KEIKI immediately.

NOTE
 Calibration requires dedicated tools and the preparation of a calibration gas. Contact RIKEN KEIKI before
performing calibration.
 The built-in sensor has an expiration date and must be replaced regularly.
 The sensor needs to be replaced if you encounter symptoms like failure to restore readings after air
calibration or fluctuating readings when performing calibration. Contact RIKEN KEIKI for replacement.

63 / 73

8. Storage and Disposal

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

8

Storage and Disposal
8-1. Procedures for storage or when not in use for extended periods
The product must be stored in the following environment: In a dark place at normal temperatures and humidity and away from direct sunlight In a place free of gases, solvents, and vapor
Store the product in its shipping carton, if retained and available. If the shipping carton is not available, store awayfrom dust and dirt.

CAUTION If the product is not to be used for extended periods, store with the battery removed. Battery leaks may
result in fire or injury.

<Procedure for reuse>
Perform calibration if the product is used again after a period in storage. (Refer to ‘7-2. Performing calibration’ in
the Technical Manual.)

64 / 73

8. Storage and Disposal

8-2. Product disposal

8-2. Product disposal
Dispose of the product as industrial waste (incombustible) in accordance with local regulations.

WARNING 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 must be removed and disposed of appropriately in accordance with waste sorting and collection or
recycling systems stipulated by the regulations of EU member states.

NOTE
Crossed-out recycle dustbin markThe pictogram at right indicates that batteries must be separated from ordinary waste
and disposed of appropriately.
This is affixed to products containing batteries to which EU Battery Directive
2006/66/EC applies. Such batteries must be disposed of appropriately.

65 / 73

9. Troubleshooting

9-1. Product abnormalities

9

Troubleshooting
9-1. Product abnormalities
Symptom

Cause
The battery is depleted.

The power cannot be
turned on.

System abnormality:[FAIL SYSTEM] appears.
Sensor abnormality:[FAIL SENSOR] appears.

The battery was inserted withpolarity reversed.
The POWER/MODE waspressed too briefly or for too
long.

Corrective action
Turn off the power and replace with a new battery
in a safe place.
(Refer to ‘3-3. Inserting the battery’.)
Reinsert the battery correctly.
(Refer to ‘3-3. Inserting the battery’.)To turn the power on, hold down the
POWER/MODE button for at least three seconds
until the buzzer blips once.
(Refer to ‘5-3. Turning on the power’.)The battery cover is not closed
Close the battery cover completely.
completely.
A circuit abnormality occurred inContact RIKEN KEIKI for repair.
the main unit.
Contact RIKEN KEIKI to request sensor
replacement.
The sensor sensitivity has
degraded.
(Refer to ‘7-6-2. Sensor replacement’ in theTechnical Manual.)

66 / 73

9. Troubleshooting
Symptom

9-1. Product abnormalities
Cause

Corrective action
Turn off the power and replace with a new battery
in a safe place.
(Refer to ‘3-3. Inserting the battery’.)

Low battery voltage alarm:
Battery levels are low.
[FAIL BATTERY] appears.
Air calibration is notpossible.
[FAIL AIR] appears.

Fresh air is not being supplied
to the product.
The sensor sensitivity has
degraded.

Clock abnormality:[FAIL CLOCK] appears.

Internal clock abnormality

The alarm does not stopeven after gas
concentrations fall below
the alarm setpoint.

You did not press the
POWER/MODE button.

[M-LIMIT] appears.

Calibration notification display* Japan Ex specification only

67 / 73

Supply fresh air around the product.
Contact RIKEN KEIKI to request sensor
replacement.
(Refer to ‘7-6-2. Sensor replacement’ in theTechnical Manual.)
Set the date and time. (Refer to ‘6-12. Date andtime setting (DATE)’ in the Technical Manual.)
If this occurs frequently, the internal clock may
be faulty.
Contact RIKEN KEIKI to request internal clock
replacement.
For GW-3 (O2), GW-3 (OX), GW-3 (HS)The product alarms are self-latching. After thealarm occurs, press the POWER/MODE button.
For GW-3 (CO), GW-3 (C-), GW-3 (CX)
If the gas alarm pattern is self-latching, press the
POWER/MODE button after the alarm occurs.
This is the operation when the calibration cycle
is reached. After the calibration notice isdisplayed, It is possible to proceed to themeasurement mode by pressing the AIR button.
However, be sure to contact your dealer ornearest sales office for maintenance.
* In the case of standard setting.

9. Troubleshooting
Symptom

9-1. Product abnormalities
Cause[CAL-LMT] appears.

Calibration expiration display* ATEX/IECEx/UKEX
specification only

[BP-LMT] appears.

Bump test expiration display

NOTE

Corrective action
Calibration expired operation. After thecalibration expiration is displayed, press the
POWER/MODE button to proceed to AUTO
calibration, or press the AIR button to proceed tomeasurement mode, but please perform
calibration by yourself or ask your dealer ornearest sales office to perform maintenance.
* Operation after calibration expires: default
setting.
Bump test expired operation. After the bump test
expiration is displayed, press the
POWER/MODE button to proceed to the bump
test. Press AIR button to go to measurementmode, but be sure to perform bump test.
* Operation after bump test expires: default
setting.

 This troubleshooting section does not address all problems that may occur with the product. Brief
explanations of causes and corrective actions have been provided to help correct common problems that
may occur frequently. If problems persist even after taking the corrective actions suggested here or if you
encounter symptoms not listed here, contact RIKEN KEIKI.

68 / 7310. Product Specifications

10-1. Common specifications

10

Product Specifications
10-1. Common specifications
Concentration display
Gas alarm indications
Fault alarm/self diagnosis
Fault alarm indications
Sampling method
Power source
Protection level
Explosion-proof
construction
Explosion-proof class

Certifications
External dimensions

LCD digital display (segments + icons)Flashing lamp, intermittent buzzer sounding, gas concentration display blinking,vibration
Sensor abnormality, low battery voltage, faulty calibration, clock abnormality,
system abnormality
Flashing lamp, intermittent buzzer sounding, fault information display
Diffusion typeCR2450 button-type lithium battery
IP66/68 (2 m, 1 h) equivalent
Intrinsically safe explosion-proof construction
Certificate of conformity for electrical equipment used in potentially explosive
atmospheres: Ex ia IIC T4 Ga
ATEX/UKEX:
II 1G Ex ia IIC T4 Ga
IECEx:
Ex ia IIC T4 Ga
Certificate of conformity for electrical equipment used in potentially explosive
atmospheres, ATEX, IECEx, UKEX
Approx. 63 mm (W) × 42 mm (H) × 22 mm (D) (excluding projections)
69 / 7310. Product Specifications
WeightFunction

10-2. Specifications by model
Approx. 45 g
Data logger, vibration, STEL, STEL alarm, integrated or TWA alarm (for CO
specification only, for Japan Ex specification only), quick calibration, peak value
display, temperature display

10-2. Specifications by model
Model
Detection target
gas
Detection
principle
Display nameSensor model
Display range(resolution)

Detection range(Japanspecification)
Detection range(Exportspecification)

GW-3 (O2)

GW-3 (OX)

GW-3 (HS)GW-3 (CO)OxygenOxygenHydrogen sulfide

Carbon monoxide

Galvanic cell type

GW-3 (C-)
Carbon monoxide*1(reduced hydrogeninterference)

GW-3 (CX)
Carbon monoxide

OxygenElectrochemical typeO2
OS-BM2 CO2ESR-X13P2

H2S
ESR-A13i
0.0 to 30.0 ppm (0.1)
30.0 to 200.0 ppm
(1.0)

CO
ESR-A13P
0 to 300 ppm (1)300 to 2,000 ppm(10)

CO
ESR-A1CP
0 to 300 ppm (1)300 to 2,000 ppm(10)

0.0 to 40.0 % (0.1)

0.0 to 40.0 % (0.1)

0.0 to 25.0 %0.0 to 25.0 %0.0 to 25.0 %0.0 to 30.0 ppm

0 to 500 ppm

0 to 500 ppm

0 to 500 ppm

0.0 to 25.0 %0.0 to 25.0 %0.0 to 100.0 ppm

0 to 500 ppm

0 to 500 ppm

0 to 500 ppm

0.0 to 25.0 %1st
50 ppm2nd
150 ppm
3rd
150 ppm
Integrated
150 ppm
STEL
200 ppm
OVER 2,000 ppm
1st
25 ppm2nd
50 ppm3rd
1,200 ppm
TWA
25 ppm
STEL
200 ppm
OVER 2,000 ppm

1st
50 ppm2nd
150 ppm
3rd
150 ppm
Integrated
150 ppm
STEL
200 ppm
OVER 2,000 ppm
1st
25 ppm2nd
50 ppm3rd
1,200 ppm
TWA
25 ppm
STEL
200 ppm
OVER 2,000 ppm

1st
50 ppm2nd
150 ppm
3rd
150 ppm
Integrated
150 ppm
STEL
200 ppm
OVER 2,000 ppm
1st
25 ppm2nd
50 ppm3rd
1,200 ppm
TWA
25 ppm
STEL
200 ppm
OVER 2,000 ppm

Alarm setpoints(Japanesestandard)

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

1st
2nd
3rd
TWA
STEL
OVER

Alarm setpoints(Exportstandard)

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

1st
2nd
3rd
TWA
STEL
OVER

1.0 ppm
10.0 ppm
10.0 ppm
1.0 ppm
5.0 ppm
200.0 ppm
5.0 ppm
30.0 ppm
100.0 ppm
1.0 ppm
5.0 ppm
200.0 ppm

70 / 73

COO2
ESR-X1DP
0 to 300 ppm (1)300 to 2,000 ppm
0.0 to 40.0 % (0.1)
(10)

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

L
LL
H
OVER

18.0 %
18.0 %
25.0 %
40.0 %

10. Product Specifications
Alarm permitted L/LL 0.0 to 20.0 %setting range
H 21.8 to 40.0 %Alarm delay
Within 5 seconds
time
Gas alarmpattern
Operatingtemperature
range
Operatinghumidity range

Operatingpressure range
Certifications
Continuous
operating time
(25 °C, no alarm,no lighting)Self-latching

10-2. Specifications by model
L/LL 0.0 to 20.0 %H 21.8 to 40.0 %1.0 to 200.0 ppm

20 to 2,000 ppm

20 to 2,000 ppm

20 to 2,000 ppm

L/LL 0.0 to 20.0 %H 21.8 to 40.0 %Within 12 seconds

Within 15 seconds

Within 30 seconds

Within 30 seconds

Within 30 seconds

Within 12 seconds

Self-latching

Japan specification: Japan specification: Japan specification:
Auto reset
Auto reset
Auto reset
Export specification: Export specification: Export specification:
Self-latching
Self-latching
Self-latching

Self-latching−20 °C to +50 °C(no sudden changes)

In temporary ambient conditions for approx. 15 minutes: −20 °C to +60 °C (no sudden changes)
Continuous use environment: −20 °C to +50 °C (no sudden changes)

10 to 90 %RH(no condensation)

In temporary ambient conditions for approx. 15 minutes: 0 to 95 %RH (no condensation)
Continuous use environment: 10 to 90 %RH (no condensation)

Self-latching

80 kPa to 120 kPa (80 kPa to 110 kPa for explosion-proof range)
JIS T 8201:2010-

Approx. 4,000 hours Approx. 2,000 hours

JIS T 8205:2018
Approx. 4,000 hours

Approx. 4,000 hours

Approx. 2,500 hours

Approx. 2,000 hours*1 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.)

71 / 7311. Appendix

11-1. Limited Warranty and Limitation Liability

11

Appendix11-1. Limited Warranty and Limitation Liability
RIKEN KEIKI CO.,LTD. (RIKEN) warrants the product to be free from defects in material and workmanship undernormal use and service for a period of the number of years to be listed in "Table: List of warranty years", beginningon the date of shipment to the buyer. This warranty extends only to the sale of new and unused products to theoriginal buyer. RIKEN’s warranty obligation is limited, at RIKEN’s option, to repair or replacement of a defective
product that is returned to a RIKEN KEIKI Quality control center located in Japan within the warranty period. In no
event shall RIKEN’s liability hereunder exceed the purchase price actually paid by the buyer for the Product.
This warranty does not include:a) fuses, disposable batteries or the routine replacement of parts due to the normal wear and tear of the productarising from use;b) any product which in RIKEN’s opinion, has been misused, altered, neglected or damaged, by accident or
abnormal conditions of operation, handling or use;c) any damage or defects attributable to repair of the product by any person other than an authorized dealer, or the
installation of unapproved parts on the product; or
The obligations set forth in this warranty are conditional on:a) proper storage, installation, calibration, use, maintenance and compliance with the product manual instructions
and any other applicable recommendations of RIKEN;b) the buyer promptly notifying RIKEN of any defect and, if required, promptly making the product available forcorrection. No goods shall be returned to RIKEN until receipt by the buyer of shipping instructions from RIKEN;
andc)the right of RIKEN to require that the buyer provide proof of purchase such as the original invoice, bill of sale or
packing slip to establish that the product is within the warranty period.
72 / 7311. Appendix

11-1. Limited Warranty and Limitation Liability

THE BUYER AGREES THAT THIS WARRANTY IS THE BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN
LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANYIMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. RIKEN SHALLNOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR BASED ON CONTRACT, TORT OR
RELIANCE OR ANY OTHER THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitationof incidental or consequential damages, the limitations and exclusions of this warranty may not apply to every
buyer. If any provision of this warranty is held invalid or unenforceable by a court of competent jurisdiction, suchholding will not affect the validity or enforceability of any other provision.
Contacting RIKEN KEIKI
Email us at: intdept@rikenkeiki.co.jp
Visit RIKEN KEIKI website at: https://www.rikenkeiki.com/
JAPAN: +81-3-3966-1113
Table: List of warranty years
Product warranty
3 years
Sensor warranty
Sensor model
Detection target gas
OS-BM2 C
Oxygen (O2)ESR-X13P2
Oxygen (O2)ESR-A13i
Hydrogen sulfide (H2S)
ESR-A13P
Carbon monoxide (CO)Carbon monoxide (CO)ESR-A1CP(reduced hydrogen Interference)
ESR-X1DP
Carbon monoxide (CO) / Oxygen (O2)73 / 73

Warranty
1 year
3 years
3 years
3 years
3 years
3 years

Revision History
Issue
0
1
2
3

4

5
6
7
8
9

Revision details
First issue
Addition「1-2. Intended use」 / Correction「10-2. Specifications by model」 /Addition「11-1. Data logger function」 /Addition「CF-6280 filter for GW-3 (CX) accessories」
Change 「Text size」 /Renamed 「Operating Manual → Operation Manual」* Corresponds to Technical Manual（PT0E-1930）
Change「Declaration of Conformity」* Corresponds to Technical Manual（PT0E-1931）
Addition「1-4. Checking standards and explosion-proof specifications」 /「CF-A13i-1 (GW-3(OX)」
Change「CF-1821 to CF-6280 (GW-3 (CO), GW-3 (C-)」 /Other amendments made to wording / 「Declaration of Conformity」*Corresponds to Technical Manual (PT0E-1932)
Addition「11-1. Limited Warranty and Limitation Liability」*Corresponds to Technical Manual (PT0E-1933)
Correction「10-2. Specifications by model」*Corresponds to Technical Manual (PT0E-1934)
Correction「9. Troubleshooting」*Corresponds to Technical Manual (PT0E-1935)
Correction「2-4. Safety information」 / 「Declaration of Conformity」*Corresponds to Technical Manual (PT0E-1936)
Correction「1-2. Intended use」「5-5. Measuring gas concentration」「10-2.
Specifications by model」*Corresponds to Technical Manual (PT0E-1937)

Issue date
11/18/2019
12/11/2019
1/21/2020
4/16/2020
4/27/2020

3/25/2021
4/28/2021
4/6/2021
10/29/2021
3/9/2023

10

Correction「1-4. Checking standards and explosion-proof specifications」「24. Safety information」「CE Declaration of Conformity」「UKCA Declaration ofConformity」*Corresponds to Technical Manual (PT0E-1938)

9/11/2023