Portable Gas Monitor

GX-3R series

GX-3R Pro


・World's smallest and lightest 5 gas monitor
・3-year warranty
・Compatible with 11 languages
・Connect with Bluetooth
・Water and dust resistant, IP66/68
・Loud alarm buzzer 95dB at 30cm

GX-3R Pro

Promotion Video

Basic Operation Explanation

RK Link Starter Guide

360 view

Sampling method

Diffusion type/Double type

Principle of detection

New Ceramic catalytic Method, Non-Dispersive Infrared Method, Potentiostatic Electrolysis Method

Detection range

Depend on target gas.

Type of alarm

Gas alarm / fault alarm
[option] panic alarm / man down alarms

Display of alarm

Flashing light / buzzer / vibration

Explosion protected construction

Intrinsic safety

Explosion-proof class

IECEx : Ex da ia IIC T4 Ga / Ex da ia I Ma
ATEX : II1G Ex da ia IIC T4 Ga / IM1 Ex da ia I Ma
*With combustible gas sensor

Ingress proof rating



Japan Ex, ATEX, IECEx, Brazil Ex, China Ex, MED, EN 60079-29-1, EN 50104, JIS, JG, EN 45544

CE marking


Power source

Lithium ion rechargeable battery unit or
Dry battery unit (AAA alkaline battery×3)

Continuous operation

Approx. 40 hours (with long battery mode) *Depends on sensor type


Approx. 73 (W) × 65 (H) × 26 (D) mm [Rechargeable battery]
Approx. 73 (W) × 65 (H) × 34 (D) mm [Alkaline battery]


Approx. 120 g [Rechargeable battery]
Approx. 140 g [Alkaline battery]

Operating temperature range

-40 ℃ to +60 ℃ (no sudden changes)

Operating humidity range

0 to 95 %RH (no condensation)

Target gas
CH4, CO, CO2, H2S, HCN, i-C4H10, NH3, NO2, O2, PH3, SO2

Promotion Video

Basic Operation Explanation

RK Link Starter Guide

4777 4577 90

Heat-resistant case

Unit case for hot environment. Uses a safety pin.

4777 4258 70

Leather case

Unit case for protection against dirt. Uses the clip on the unit.

4777 9203 10

Ultra-slim alligator clip (with attachment screw)

Can be mounted in various orientations due to 360° rotation.

4777 9202 40

Belt clip

Allows the product to be attached to a belt or pocket.

4777 9293 30

Arm/ankle belt

Belt for securing the unit to your arm or ankle.

4777 9296 50

Protective film

Protects the display.


Manual suction unit

External manual pump. Draws in at greater flow rates than electric pump.
■Part No. 4777 9297 20
with sampling rod
■Part No. 4777 9299 70
with 8m float-type tube
■Part No. 4777 9300 30
with weighted 30m tube

BC-3R 00

Charging cradle

Cradle for recharging the unit. Cradles can be interconnected.


Five-unit charging cable

One AC adapter recharges up to five units. *Recharging times remain unchanged.
■Part No. 4777 9329 70
cable length: 22.5cm
■Part No. 4777 9319 80
cable length: 60cm
■Part No. 4777 9333 20
cable length: 120cm

9811 0860 70

Data management program

Software for viewing and managing measurement data.