Semiconductor Integrated Gas Sensor MQ138
Sensitive material of MQ138 gas sensor is SnO2, which with lower conductivity in clean air. When VOC 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. MQ138 gas sensor has high sensitivity to toluene, acetone, alcohol, methanol, also can monitor hydrogen and other organic vapour well. It can detect kinds of organic gases and is a kind of low-cost sensor for kinds of applications.
It has good sensitivity to organic vapour 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||toluene, acetone,
|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.）|
|Sensitivity||S||Rs(in air)/Rs(in 50ppm toluene)≥2|
|Output Voltage||△Vs||0.5V (in 50ppm toluene)|
|Concentration Slope||α||≤0.6(R200ppm/R50ppm toluene)|
|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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