PC0E-1042

Among the world’s smallest and lightest portable gas monitor

ModelSafety at your side
Now evolved intoa wearable device

that weighs just45ｇ

Small, portable design for wear directly

Model GW-3 (OX)O2• At a mere 45 g, this small, portable design lets you to wear the device
on your wrist, arm, or anywhere else
— for example, on a helmet band.
• In addition to buzzers and lamps, alarms are indicated by vibrations.
Wear the device on your wrist or arm for immediate vibration alerts inthe presence of danger, even in loud environments.

Detection target gas: Oxygen(electrochemical type)O2(G)Worn on arm (band type)

Mounted to helmet band

* Attached to arm band

* Attached to belt clip

Detection target gas: Hydrogen sulfide

Model GW-3 (CO)Incorporates durable new R sensor with advanced functions• The sensor’s superior durability and performance are backed bya three-year warranty (one year sensor warranty for GW-3 (O2)).
• Usable across a wide range of temperatures (-20 °C to +60 °C).
• We offer a lineup of carbon monoxide sensors almost entirely resistantto hydrogen interference. They’re ideal for use in environments like steel
facilities where hydrogen is present.
• We’re the first Japanese manufacturer to offer a lineup of dual carbon
monoxide and oxygen sensors, bringing two-channel detection to themarket in a compact and portable form factor.

A safe design you can use anywhere• Protection level: Equivalent to IP66/68 (2 m, 1 h); designed
to resist dust and water for confident use outdoors.
• Intrinsically safe explosion-proof design (ATEX/IECEx/INMETROJapan Ex) to allow use in hazardous locations.

Detection target gas: Carbon monoxide

CO(-H2)*Attached to watch bandCO

Detection target gas: Oxygen(galvanic cell type)

Model GW-3 (HS)

H2S
COAttached to wrist(wristwatch type)

Model GW-3 (O2)O2Model GW-3 (C-)
Detection target gas: Carbon monoxide(reduced hydrogen interference)

Model GW-3 (CX)
Detection target gas: Carbon monoxide
and oxygen

Description of the display

Name of gas
Concentration display
Time/data display

Battery level
Operating status
Units

The GW-3 (CX) can simultaneously display concentrations forboth carbon monoxide and oxygen.

RIKEN KEIKI CO., LTD.

ModelGW-3

Common specifications
Sampling method

Diffusion type

Alarm

Gas alarms: Three-step alarms, STEL alarm, TWA alarm, OVER alarm
Fault alarms: Sensor connection/disconnection, low battery level, calibration failure, clock abnormality, system abnormality

Alarm reset typeSelf-latching or auto-reset (*1)

Alarm action

Flashing lamp, intermittent audible buzzer, flashing gas concentration readout, vibration

Buzzer volume

80 dB or louder (at 30 cm)

Power source*2

CR2450 coin-type lithium batteryExplosion-proof construction

Intrinsically safe explosion-proof construction
ATEX: II1G Ex ia IIC T4 Ga/IECEx: Ex ia IIC T4 Ga/INMETRO: Ex ia IIC T4 Ga/Japan Ex: Ex ia IIC T4 Ga

Certifications

ATEX, IECEx, INMETRO, Japan Ex, CE Marking

Protection level

Equivalent to IP66/68 (2 m, 1 h)External dimensions/weightApprox. 63 mm (W) × 42 mm (H) × 22 mm (D) (excluding projections)/approx. 45 g

Functions

Data logger, vibration, STEL alarm, TWA alarm, quick calibration, peak value display, temperature display

Individual model specifications
Model

GW-3 (O2)

GW-3 (OX)

Detection
target gas

OxygenDetection
principle

Galvanic cell type

Detection range(Indication range)

0.0 to 25.0 %(0.0 to 40.0 %)0.0 to 25.0 %(0.0 to 40.0 %)

0.1 %

0.1 %

L 18.0 %LL 18.0 %H 25.0 %L 18.0 %LL 18.0 %H 25.0 %Resolution

Alarm setpoints

GW-3 (HS)OxygenHydrogen sulfide

GW-3 (CO)GW-3 (C-)

Carbon monoxide

Carbon monoxide(Reduced hydrogeninterference)

GW-3 (CX)
Carbon monoxide

Oxygen0 to 500 ppm(0 to 2000 ppm)

0 to 500 ppm(0 to 2000 ppm)

0.0 to 25.0 %(0.0 to 40.0 %)Electrochemical type
0.0 to 100.0 ppm(0.0 to 200.0 ppm)

0 to 500 ppm(0 to 2000 ppm)

0.1 ppm (0.0 to 30.0 ppm) 1 ppm (0 to 300 ppm)
1 ppm (0 to 300 ppm)
1 ppm (0 to 300 ppm)
1.0 ppm (30.0 to 200.0 ppm) 10 ppm (300 to 2000ppm) 10 ppm (300 to 2000 ppm) 10 ppm (300 to 2000 ppm)
1st
5.0 ppm
2nd 30.0 ppm
3rd 100.0 ppm
TWA
1 ppm
STEL5 ppm

1st25 ppm
2nd50 ppm
3rd 1200 ppm
TWA25 ppm
STEL 200 ppm

1st25 ppm
2nd50 ppm
3rd 1200 ppm
TWA25 ppm
STEL 200 ppm

1st25 ppm
2nd50 ppm
3rd 1200 ppm
TWA25 ppm
STEL 200 ppm

0.1 %L 18.0 %LL 18.0 %H 25.0 %response time
T90*3

within 20 seconds
within 30 seconds within 30 seconds
within 30 seconds within 30 seconds
within 30 seconds
within 30 seconds(Typical: 9 seconds) (Typical: 8 seconds) (Typical: 18 seconds) (Typical: 6 seconds) (Typical: 17 seconds) (Typical: 7 seconds) (Typical: 15 seconds)

Operatingtemperaturerange-20 °C to +50 °C(no sudden changes)-20 °C to +60 °C (no sudden changes)*4

Operatinghumidity range

10 to 90 % RH(no condensation)

0 to 95 % RH (no condensation)*5

Continuous
operating time

Approx. 4,000 hours

Approx. 2,000 hours

Approx. 4,000 hours

Approx. 4,000 hours

Approx. 2,500 hours

Approx. 2,000 hours*1. Standard setting: Self-latching*2. Use dry-cell batteries listed on the Certificate to meet the explosion-proof performance.
*3. Typical indicates an average value.
*4. Temporary ambient conditions for approx. 15 minutes. The continuous operating ambient temperature ranges are as follows: temperature: -20 °C to +50 °C (no sudden changes)*5. Temporary ambient conditions for approx. 15 minutes. The continuous operating ambient humidity ranges are as follows: humidity: 10 to 90 % RH (no condensation)

Accessories

 CR2450 coin type lithium ion battery(×1)
 Alligator clip (×1)

Names of parts

Optional accessories

 Wristwatch belt Belt clip
 Alligator clip Heat-resistant case*6
 Dust filter Filters Calibration cap Leather case Arm band
 Data logger management program

Alarm lamp

SensorBuzzer soundport
AIR button

POWER/MODEbutton*6. This cover is non-explosion proof.

Distributed by:
2 -7-6 Azusawa, Itabashi-ku, Tokyo 174 - 8744, Japan

Phone : +81-3-3966-1113
Telefax : +81-3-3558-9110
E-mail : intdept@rikenkeiki.co.jp
Web site : https://www.rikenkeiki.co.jp/english※ The contents described in this catalog are

subject to change without notice according
to the performance improvement.

PC0E-1042-201100 S