Gas detector – Portable gas monitor 04 series (RIKEN KEIKI Co., Ltd.)

  • Seven models is available depending on target gas
  • 3-years warranty
  • Newly developed R sensor installed for improving performance

There is seven types of gas monitor depends on “Detection target gas”.

Common specifications

Sampling methodDiffusion type
Alarm typeGas 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 patternSelf-latching or auto-reset*1
Alarm indicationsFlashing lamp, intermittent audible buzzer , flashing gas concentration readout, vibration
Buzzer volume80 dB or louder (at 30 cm)
Power source*2AAA alkaline batteries (×2) or AAA Ni-MH (eneloop) batteries (×2)
Explosion-proof constructionIntrinsically safe explosion-proof construction
<alkaline batteries> ATEX : Ⅱ1G Ex iaⅡC T4 Ga / IECEx : Ex ia ⅡC T4 Ga / Japan Ex : Ex ia ⅡC T4 Ga
<Ni-MH batteries> ATEX : Ⅱ1G Ex ia ⅡC T3 Ga / IECEx : Ex ia ⅡC T3 Ga / Japan Ex : Ex ia ⅡC T3 Ga
CertificationsATEX, IECEx, Japan Ex, CE Marking
Protection levelEquivalent to IP66/67
External dimensions / weightApprox. 54mm(W)×67mm(H)×24mm(D) (excluding projections) / approx. 93 g
FunctionsData logger, vibration, STEL alarm, TWA alarm, quick calibration, peak value display, temperature display

Individual model specifications

ModelOX-04GOX-04HS-04CO-04CO-04(C-)CX-04SC-04
Detection target gasOxygenOxygenHydrogen sulfideCarbon monoxideCarbon monoxide
(Reduced hydrogen interference)
Carbon monoxideOxygenSulfur dioxide
Detection principleGalvanic cell typeElectrochemical type
Detection range(Service range)0.0 to 25.0%
(25.0 to 40.0%)
0.0 to 25.0%
(25.0 to 40.0%)
0.0 to 30.0ppm
(30.0 to 200.0ppm)
0to 500ppm
(500 to 2000ppm)
0to 500ppm
(500 to 2000ppm)
0to 500ppm
(500 to 2000ppm)
0.0 to 25.0%
(25.0 to 40.0%)
0.00 to 20.00ppm
(20.00 to 100.00ppm)
1 digit0.1%0.1%0.1ppm(0.0 to 30.0ppm)
1.0ppm (30.0 to 200.0ppm)
1ppm( 0 to 300ppm)
10ppm (300 to 2000ppm)
1ppm( 0 to 300ppm)
10ppm (300 to 2000ppm)
1ppm( 0 to 300ppm)
10ppm (300 to 2000ppm)
0.1%0.05ppm
Alarm setpointsL 18.0%
LL 18.0%
H 25.0%
L 18.0%
LL 18.0%
H 25.0%
1st 5.0ppm
2nd 30.0ppm
3rd 100.0ppm
TWA 1ppm
STEL 5ppm
1st 25ppm
2nd 50ppm
3rd 1200ppm
TWA 25ppm
STEL 200ppm
1st 25ppm
2nd 50ppm
3rd 1200ppm
TWA 25ppm
STEL 200ppm
1st 25ppm
2nd 50ppm
3rd 1200ppm
TWA 25ppm
STEL 200ppm
L 18.0%
LL 18.0%
H 25.0%
1st 2ppm
2nd 5ppm
3rd 100ppm
TWA 2ppm
STEL 5ppm
Operating temperature range-20℃ to +50℃(no sudden changes)-40℃ to +60℃(no sudden changes)*3
Operating humidity range10 to 90 % RH(no condensation)0 to 95% RH (no condensation)*4
Continuous operating time (Alkaline batteries)
(Ni-MH batteries)
Approx. 9,000 hours
Approx. 6,000 hours
Approx. 3,000 hours
Approx. 2,000 hours
Approx. 9,000 hours
Approx. 6,000 hours
Approx. 9,000 hours
Approx. 6,000 hours
Approx. 6,200 hours
Approx. 4,200 hours
Approx. 4,600 hours
Approx. 3,000 hours
Approx. 3,000 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 Temporary ambient conditions for approx. 15 minutes. The continuous operating ambient temperature ranges are as follows: temperature : -20℃ to + 50℃ (no sudden changes)
*4 Temporary ambient conditions for approx. 15 minutes. The continuous operating ambient humidity ranges are as follows : humidity : 10 to 90% RH ( no condensatioxxn)

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