Riken Keiki GW-3 User manual

PT0E-1930
Portable Gas Monitor
GW-3
Technical Manual
（PT0-188）
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Website: http://www.rikenkeiki.co.jp/

Contents
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Contents
1. Product Overview....................................................................................................................................................5
1-1. Introduction......................................................................................................................................................5
1-2. Intended use....................................................................................................................................................7
1-3. DANGER, WARNING, CAUTION, and NOTE..................................................................................................8
2. Important Safety Information....................................................................................................................................9
2-1. Danger information ..........................................................................................................................................9
2-2. 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
5-5. Measuring gas concentration.........................................................................................................................46

Contents
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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
6-3. Calibration expiration setting (CAL SET)........................................................................................................62
6-3-1. Calibration expiration ON/OFF (CAL.RMDR).......................................................................................62
6-3-2. Calibration expiration date interval (CAL.INT) ......................................................................................64
6-3-3. Setting operation after calibration date expires (CAL.EXPD)................................................................65
6-4. Bump test expiration setting (BUMP.SET)......................................................................................................66
6-4-1. Bump test setting (SETTING) ..............................................................................................................67
6-4-2. Bump test expiration ON/OFF (BP.RMDR)...........................................................................................71
6-4-3. Bump test expiration date interval setting (BP.INT)...............................................................................72
6-4-4. Setting behavior after bump test expiration (BP.EXPD)........................................................................73
6-5. Alarm setpoint setting (ALARM-P)..................................................................................................................75
6-5-1. Alarm setpoint setting...........................................................................................................................75
6-5-2. Resetting alarm setpoints (DEF.ALMP)................................................................................................78
6-6. Lunch break ON/OFF (LUNCH).....................................................................................................................79
6-7. Confirmation beep setting (BEEP)..................................................................................................................80
6-7-1. Beep operation setting (BEEP.SEL).....................................................................................................80
6-7-2. Beep interval setting (BEEP.INT) .........................................................................................................81
6-8. LCD lighting time setting (BLTIME) ...............................................................................................................82
6-9. Key operation tone ON/OFF (KEY.TONE)......................................................................................................83
6-10. Display mode item display ON/OFF (DISP.SET)..........................................................................................84
6-11. Quick calibration time setting (E-CAL)..........................................................................................................85
6-12. Date and time setting (DATE).......................................................................................................................86
6-13. User mode password setting (PASS-W).......................................................................................................87

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6-14. ROM/SUM display (ROM/SUM)...................................................................................................................88
7. Maintenance..........................................................................................................................................................89
7-1. Maintenance intervals and maintenance items...............................................................................................89
7-2. Performing calibration....................................................................................................................................91
7-2-1. Preparation for calibration....................................................................................................................91
7-2-2. Displaying the calibration (GAS CAL) screen.......................................................................................96
7-2-3. Performing air calibration.....................................................................................................................97
7-2-4. PerformingAUTO calibration .............................................................................................................100
7-3. Performing bump tests.................................................................................................................................108
7-4. Performing alarm tests................................................................................................................................. 114
7-5. Cleaning instructions.................................................................................................................................... 116
7-6. Parts replacement........................................................................................................................................ 117
7-6-1. Periodic replacement parts................................................................................................................ 117
7-6-2. Filter replacement.............................................................................................................................. 118
7-6-3. Sensor replacement...........................................................................................................................124
8. Storage and Disposal ..........................................................................................................................................127
8-1. Procedures for storage or when not in use for extended periods..................................................................127
8-2. Product disposal ..........................................................................................................................................128
9. Troubleshooting...................................................................................................................................................129
9-1. Product abnormalities ..................................................................................................................................129
10.Product Specifications .........................................................................................................................................131
10-1. Common specifications..............................................................................................................................131
10-2. Specifications by model .............................................................................................................................132
11.Appendix .............................................................................................................................................................134
11-1. Data logger function...................................................................................................................................134
11-2. Terminology................................................................................................................................................137

1. Product Overview 1-1. Introduction
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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.
The contents of this manual are subject to change without notice to allow product improvements. Any duplication
or reproduction of this manual without permission is prohibited, whether in whole or in part.
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.

1. Product Overview 1-1. Introduction
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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)
GW-3 (OX)
GW-3 (CO)
GW-3 (HS)
GW-3 (C-)
GW-3 (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)).
O2
OX
CO
HS
C-
CX

1. Product Overview 1-2. Intended use
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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
Detection target gas
GW-3 (O2)
Oxygen(Galvanic cell type)
GW-3 (OX)
Oxygen(Electrochemical type)
GW-3 (CO)
Carbon monoxide
GW-3 (HS)
Hydrogen sulfide
GW-3 (C-)
Carbon monoxide*
GW-3 (CX)
Carbon monoxide, oxygen
*The carbon monoxide sensor (ESR-A1CP) includes a correction function to reduce hydrogen interference. This
function works for hydrogen concentrations up to 2,000 ppm.

1. Product Overview 1-3. DANGER, WARNING, CAUTION, and NOTE
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1-3. DANGER, WARNING, CAUTION, and NOTE
This 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.

2. Important Safety Information 2-1. Danger information
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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 or
less).
•Be sure to replace the battery in a safe place.
•The explosion-proof class of the product is Ex ia IIC T4 Ga.

2. Important Safety Information 2-1. Danger information
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•The ratings are as follows:
・Japan models:
Power supply: 3 V DC, 1 mA (using one Murata CR2450 battery)
Ambient temperature: −20 °C to +60 °C
・Export models:
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 models: One CR2450 (Murata)
・Export models: One CR2450 (Murata), CR2450B (Sony), or DL2450 (Duracell)
DANGER
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.
OX
O2
CX

2. Important Safety Information 2-2. Warning information
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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 is
also 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 models: One CR2450 (Murata)
・Export models: 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 during
use, turn off the power and replace the battery.
Handling the calibration gas
•The calibration gas is nitrogen or 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.
•Calibration gas must be used by itself. Calibration can be performed with a gas mixture. However,
calibrations performed with a gas mixture will result in poor sensitivity and inaccurate concentration
readings. But, in the calibration of GW-3(CX), nitrogen and carbon monoxide can use not only itself but also
the mixed gases.

2. Important Safety Information 2-2. Warning information
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Sensor handling
•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 result
in 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 an 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.
WARNING
Battery 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 turn
the power on again after waiting at least 10 minutes.
CX
O2

2. Important Safety Information 2-2. Warning information
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WARNING
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 to
hydrogen interference.
•Due to the hydrogen compensation mechanism, carbon monoxide readings may increase temporarily if
hydrogen gas concentrations increase rapidly in the atmosphere being measured.
C-

2. Important Safety Information 2-3. Caution information
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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 radio
transmitters 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 high
voltage 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 at
temperatures or humidity levels outside the indicated operating range.

2. Important Safety Information 2-3. Caution information
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GW-3(O2):
Continuous use environment: 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.
•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 a
few 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 operating 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.

2. Important Safety Information 2-3. Caution information
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When using the product at temperatures below 0 °C, confirm that the battery level icon shows at least three
bars.
•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 battery promptly, then wait at least 10 minutes before turning the power on. If the product is
stored for extended periods with the battery removed, a [FAIL SENSOR] (sensor abnormality) alarm may
occur in rare cases when the power is turned on. If this occurs, wait at least a few tens of minutes*2before
turning the power back on.
Battery replacement
•Be sure to turn off the power for the product before replacing the battery.
•Always replace the battery 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.
Storage
•If the product will not be used for extended periods, store with the battery 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-),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

2. Important Safety Information 2-3. Caution information
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CAUTION
Gas alarm activation
•If sensor has been exposed to high concentrations of gas (including the detection target gas or interference
gas), it may take several minutes, or even several hours, for the display readout to return to zero (or
20.9 %). (For example, high concentrations of hydrogen, unsaturated hydrocarbons, alcohol, etc.)
CAUTION
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.
CAUTION
Calibration
•Calibration of hydrogen gas may become impossible when the product is used or stored for extended
periods in dry environments.
If [FAILA-CAL] (calibration abnormality) appears during hydrogen sensitivity calibration, leave the product
C-
OX
CX
OX
CO
HS
CX
C-

2. Important Safety Information 2-4. Safety information
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overnight or longer in a location with sufficient humidity, then perform calibration once again. If it is not
possible to perform CO sensitivity calibration, contact Riken Keiki to request sensor replacement.
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 models.)
<Certificate numbers>
IECEx Certificate number: IECEx DEK 18.0082
ATEX Certificate number: DEKRA 18 ATEX 0130

2. Important Safety Information 2-4. Safety information
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<List of standards>
IEC 60079-0:2017 ・EN60079-0:2012+A11:2013
IEC 60079-11:2011 ・EN60079-0:2018
・EN60079-11:2012
<Guidelines>
JNIOSH-TR-46-1:2015
JNIOSH-TR-46-6:2015

2. Important Safety Information 2-4. Safety information
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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 by
Duracell (CR2450 by Murata only for Japan models).
Note the following:
・Only CR2450 batteries can be used.
INST. No. 0 0 0 0 0 00000 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: [phone]
Fax: [phone] GIII
Email: [e-mail]
Website: http://www.rikenkeiki.co.jp