Portable Gas Monitor

04 series



・Two-component portable gas monitor with long
 continuous operating time
・Incorporates durable new R sensor with advanced functions
・Three-year sensor warranty

Sampling method

Diffusion type

Principle of detection

Potentiostatic Electrolysis Method

Detection range

CO:0 to 500 ppm(Display range 0 to 300 ppm / 300 to 2000 ppm)
O2:0.0 to 25.0 vol%(0.0 to 40.0 vol%)

Alarm setpoints

CO : 1st 25 ppm 2nd 50 ppm 3rd 1200 ppm TWA 25 ppm STEL 200 ppm OVER 2000 ppm
O2 : L 18.0 vol% LL 18.0 vol% H 25.0 vol% OVER 40.0 vol%

Type of alarm

Gas alarm / fault alarm

Display of alarm

Flashing lamp / intermittent buzzer sounding / gas concentration display blinking / vibration

Explosion protected construction

Intrinsic safety

Explosion-proof class

IECEx : Ex ia ⅡC T4 Ga (AAA alkaline), Ex ia ⅡC T3 Ga (Ni-MH)
ATEX : Ⅱ1G Ex ia ⅡC T4 Ga (AAA alkaline), Ⅱ1G Ex ia ⅡC T3 Ga (Ni-MH)

Ingress proof rating

IP66/67 equivalent


Japan Ex, ATEX, IECEx, Brazil Ex

CE marking


Power source

AAA alkaline or Ni-MH (eneloop) batteries (x2)

Continuous operation

Approx. 4600 hours (AAA alkaline)
Approx. 3000 hours (Ni-MH)


Approx. 54 (W) x 67 (H) x 24 (D) mm (excluding projections)


Approx. 93g

Operating temperature range

-40℃ to +60℃ (no sudden changes)
(Approx. 15-minute temporry use environment: -20℃ to +50℃[no sudden changes])

Operating humidity range

0 to 95%RH (no condensation)
(Approx. 15-minute temporry use environment: 10 to 90%RH[no condensation])

Operating pressure range

80 to 120 kPa (80 to 110 kPa for explosion-proof range)