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MQ137 Schematic ( PDF Datasheet ) - Hanwei
| Teilenummer | MQ137 |
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| Beschreibung | Semiconductor Sensor | |
| Hersteller | Hanwei | |
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Gesamt 3 Seiten 
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:
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| PDF Download | [ MQ137 Schematic.PDF ] | |
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