Semiconductor NH3 Sensor MQ137
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.
It has good sensitivity to NH3 gas in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Formaldehyde detector is an instrument for detecting formaldehyde. Generally, semiconductor sensors and electrochemical sensors are used to realize the rapid semi-quantification of formaldehyde in indoor air on the spot, which is characterized by simple structure, small size, intuitive,easy to carry and use.
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Technical Data Sheet
|Standard Encapsulation||Bakelite, Metal cap|
|Target Gas||Ammonia Gas(NH3)|
|Detection range||5～500ppm NH3|
|Standard Circuit Conditions||Loop Voltage||VC||5.0V±0.1V DC|
|Heater Voltage||VH||5.0V±0.1V AC or DC|
|Sensor character under standard test conditions||Heater Resistance||RH||30Ω±3Ω（room temp.）|
|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；
|Preheat time||Over 48 hours|
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