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MQ137

Hanwei
Part Number MQ137
Manufacturer Hanwei
Description Semiconductor Sensor
Published Feb 25, 2015
Detailed Description MQ137 Semiconductor Sensor for Ammonia Sensitive material of MQ137 gas sensor is SnO2, which with lower conductivity in...
Datasheet PDF File MQ137 PDF File

MQ137
MQ137


Overview
MQ137 Semiconductor Sensor for Ammonia Sensitive material of MQ137 gas sensor is SnO2, which with lower conductivity in clean air.
When the target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration rising.
Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.
MQ137 gas sensor has high sensitity to Ammonia, also to other organic amine.
The sensor could be used to detect different gas which contains Ammonia, it is with low cost and suitable for different application.
Character * Good sensitivity to Ammonia * Long life and low cost * Simple drive circuit Configuration Application * Domestic Ammonia detector * Industrial Ammonia gas detector * Portable gas detector Technical Data Basic test loop Model No.
MQ137 Sensor Type Semiconductor Standard Encapsulation Bakelite (Black Bakelite) Detection Gas Ammonia Concentration 5-500ppm (Ammonia) Circuit Loop Voltage Heater Voltage Load Resistance Vc VH RL ≤24V DC 5.
0V±0.
2V ACorDC Adjustable Heater Resistance RH 31Ω±3Ω（Room Tem.
） Character Heater consumption Sensing Resistance PH Rs ≤900mW 2KΩ-15KΩ(in 50ppm NH3 ) Sensitivity S Rs(in air)/Rs(5000ppm CH4)≥5 Slope α ≤0.
6(R100ppm/R50ppm NH3) Tem.
Humidity 20℃±2℃；65%±5%RH Condition Standard test circuit Vc: 5.
0V±0.
1V； VH: 5.
0V±0.
1V Preheat time Over 48 hours Power of Sensitivity body(Ps): Ps=Vc2×Rs/(Rs+RL)2 Vc VRL RL VH GND The above is basic test circuit of the sensor.
The sensor need to be put 2 voltage, heater voltage（VH）and test voltage（VC）.
VH used to supply certified working temperature to the sensor, while VC used to detect voltage (VRL) on load resistance （RL）whom is in series with sensor.
The sensor has light polarity, Vc need DC power.
VC and VH could use same power circuit with precondition to assure performance of sensor.
In order to make the sensor with better performance, suitable RL value is needed: Resistance of sensor(Rs)...


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