Principle Introduction:
MH-441D infrared gas sensor is a miniature universal intelligent sensor, which adopts NDIR theory to detect concentration of CH4 in air and has good selectivity, stable performance, long life, also is independent of Oxygen. The inside temperature sensor could be used for temperature compensation. This miniature infrared gas sensor is developed by the tight integration of mature infrared absorbing gas detection technology, micro machine workout and superior circuit design.
It is convenient in use and also instead of catalytic component directly, widely used in various occasions with flammable and explosion hazard gas.

Applications :
Widely used for HVAC refrigeration, air monitoring indoor, industrial-process control and safety protection, agriculture and animal husbandry.

Technical parameters :

Tips:For more parameter information, please refer to the latest manual provided by salesman.

Detection Gas	Methane (CH4)
WorkingVoltage	3.6~5.0VDC (Need to be powered by safety barrier)
Average Current	＜85mA
Interface Level	3.0V
Detection range	0~10%vol(selectable, refer fig2.)
OutputSignal	UART(3.0V)
OutputSignal	0.4~2.0VDC
Warm-up time	3 min
Response time	T90<30 seconds
WorkingTemperature	-20°C ~ 60°C
WorkingHumidity	0~95%RH(no condensation)
Sizes	Φ20×22.6mm
Weight	35g
Lifetime	>5 years
Defense Grade	IP54
Power, communication terminal Intrinsic safety	Ui=7.5VDC，Ii=265mA， Pi=0.5W，Ci=10μF，Li=0mH

Reference Circuit :

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