Riken Keiki GW-3 User manual

PT0E-1887
Portable Gas Monitor
GW-3
Operation Manual
(PT0-188)
2-7-6 Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan
Website: https://www.rikenkeiki.co.jp/

Contents
2 / 73
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.........................................................................................................................................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

Contents
3 / 73
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

1. Product Overview 1-1. Introduction
4 / 73
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 for
download 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.

1. Product Overview 1-3. DANGER, WARNING, CAUTION, and NOTE
7 / 73
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
9 / 73
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 MΩor
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 2-2. Warning information
11 / 73
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 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.

2. Important Safety Information 2-2. Warning information
13 / 73
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
14 / 73
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.
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.

2. Important Safety Information 2-3. Caution information
15 / 73
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 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 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.

2. Important Safety Information 2-4. Safety information
18 / 73
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
19 / 73
<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
20 / 73
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 0 0 0 0 0 0
A B 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: [email protected]
Website: https://www.rikenkeiki.co.jp