Portable Gas Monitor

GX-3R series



・World's smallest and lightest 4 gas monitor
・3-year warranty
・Only Approx. 100g
・Water and dust resistant, IP66/68
・Loud alarm buzzer 95dB at 30cm



GX-3R Opration

360 View

Sampling method

Diffusion type/Double type

Principle of detection

New Ceramic catalytic Method, Potentiostatic Electrolysis Method

Detection range

0 to 100 %LEL (HC/CH4)
0 to 40 vol% (O2)
0 to 2000 ppm (CO)
0 to 200 ppm (H2S)

Type of alarm

Gas alarm / Fault alarm

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 : II 1 G Ex da ia IIC T4 Ga / I M1 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

Continuous operation

Approx. 40 hours after full charge (with long battery mode)


Approx. 58 (W) ×65 (H) × 26 (D) mm


Approx. 100 g

Operating temperature range

-40 ℃ to +60 ℃ (no sudden changes)

Operating humidity range

0 to 95 %RH (no condensation)

Target gas
CH4, CO, H2S, i-C4H10, O2

4777 4577 90

Heat-resistant case

Unit case for hot environment.
Uses a safety pin.

4777 4257 00

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 forsecuring 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 9302 80
with sampling rod
■Part No. 4777 9304 20
with 8m float-type tube
■Part No. 4777 9305 00
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.