Principle Introduction:
Winsen Electronics produce semiconductor ammonia sensor, NH3 Gas sensor MQ137 for NH3 gas alarm, industrial NH3 gas leakage alarm, portable NH3 gas detector.
Sensitive material of MQ137 gas sensor is SnO2, which with lower conductivity in clean air. When NH3 gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
MQ137 gas sensor has high sensitivity to NH3 gas, also can monitor organic amine such as trimethylamine, cholamine well. It can detect kinds of gases including ammonia and is a kind of low-cost sensor for kinds of applications.
Applications :
It is widely used in domestic NH3 gas alarm, industrial NH3 gas leakage alarm, portable NH3 gas detector.
Technical parameters :
Tips:For more parameter information, please refer to the latest manual provided by salesman.
| Model |
MQ137 |
| Sensor Type |
Semiconductor |
| Standard Encapsulation |
Bakelite, Metal cap |
| Target Gas |
Ammonia Gas(NH3) |
| Detection range |
5～500ppm NH3 |
| Standard Circuit Conditions |
Loop Voltage |
Vc |
≤24V DC |
| Heater Voltage |
VH |
5.0V±0.1V AC or DC |
| Load Resistance |
RL |
Adjustable |
| Sensor character under standard test conditions |
Heater Resistance |
RH |
29Ω±3Ω(room tem.) |
| Heater consumption |
PH |
≤900mW |
| Sensitivity |
S |
Rs(in air)/Rs(50ppmNH3)≥2 |
| Output Voltage |
△Vs |
≥0.5V (in 50ppm NH3) |
| Concentration Slope |
α |
≤0.6(R200ppm/R50ppm NH3) |
| Standard test conditions |
Tem. Humidity |
20℃±2℃；55%±5%RH |
| Standard test circuit |
Vc:5.0V±0.1V； VH: 5.0V±0.1V |
| Preheat time |
Over 48 hours |
Datasheet Download
