Continuous detection of flammable, CO2, CO and N2O gas in explosion hazardous area with flame proof structure State-of-the art infrared detection principle Operation in non oxygen environment Digital flow sensor to maintain regular flow rate Fast response detection of gas leakage with a high efficient pump inside Self diagnosis function with built-in Microprocessor Fast response time(<6 sec) Stable quality and proved detection principle for service life Auto calibration and program setting with a magnet bar 4-digit digital gas concentration display 4-20mA (Current source or Sink) output signal Easy configuration of monitoring system by RS-485 Modbus communication 3-Wire Type 2-stage alarm, 1-trouble display and relay contact output Calibration and maintenance by one-man