Winsen MQ138 VOC Gas Sensor

Original price was: ₹2,429.00.Current price is: ₹2,424.00.

MQ138 gas sensor has a high sensitivity to toluene, acetone, alcohol, and methanol, and 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 varieties of applications.

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Winsen Electronics manufactures an air quality sensor and VOC sensor MQ138 for IAQ monitor applications.
The sensitive material of the MQ138 gas sensor is SnO2, which with lower conductivity in clean air. When VOC gas exists, the sensor’s conductivity increases, and the gas concentration rises. Users can convert the conductivity change to the corresponding output signal of gas concentration through a simple circuit.
It is widely used in domestic VOC gas alarms, industrial VOC gas leakage alarms, and portable VOC gas detectors.

Model No. MQ138
Target Gases toluene, acetone, alcohol, hydrogen
Heater Voltage 5.0V±0.1V AC or DC VH
Load Resistance Adjustable RL
Heater Resistance 29Ω±3Ω( room tem.)RH
Heater power consumption ≤900mW PH
Sensitivity(S) Rs(in air)/Rs(in 50ppm toluene)≥2
Output Voltage(V) ≥0.5V (in 50ppm toluene)
Concentration Slope ≤0.6(R200ppm/R50ppm toluene)
Temperature Humidity 20℃±2℃;55%±5%RH
Standard test circuit Vc:5.0V±0.1V; VH:5.0V±0.1V
Preheat time Over 48 hours


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