KOMYO RIKAGAKU KOGYO K.K. PRODUCT INFORMATION(Combustible Gas Monitor (calibarted as Methane):For explosion prevention, explosion-proof, suction type(calibrated as Methane):FM-621E)
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Portable Gas Monitors
Combustible Gas Monitor (calibarted as Methane)
For prevention of combustible gas leak, suction type
* FM-621E
  • Delivers gas alarm and/or any trouble with loud sound(above 90dB/10cm)
  • Large LCD display for easy reading
  • Delivers alarm with bright LED flickers,
    in operation(GREEN), alarm(RED), trouble(ORANGE)
  • Powerful suction pump, fast response time
  • Ex Explosionproof


Measuring Gas Combustible gas in the air (calibrated as Methane)
Measuring Principle Catalytic Combustion
Sampling Method Suction type
Approx. 0.6L/min (at room temperature with gas sampling tube with sampling probe(2.4m))
Measuring Range 0-100%LEL
Resolution 1%LEL
Detectable accuracy ±10%LEL
Aralm accuracy ±10%LEL
Alarm Concentration 20%LEL
Alarm Method LCD display, LED Lamp and Buzzer
Response Time Within 25 seconds at 90% response from sampling gas inlet at 20°C
Operating Temperature Range -10-40°C; below 95%RH (non-condensing)
Pressure range 80-110kPa
Power Source 3 × "AA" size Alkaline batteries
Continuous Operation time Alkaline batteries : approx. 8 hrs (no alarm)
Explosionproof ExiadII CT4X
Main Body Dimensions 78 (W) X 200 (H) X 50 (D)mm
Main Body Weight Approx. 550g (including batteries)
Standard Accessories Gas sampling tube with sampling probe(2.4m), leather case, carrying case