1 PC MQ138 VOC Gas Sensor

$34.00
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....

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Availability: 499 In Stock
Categories: VOC sensor

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.

Application

It is widely used in domestic VOC gas alarm, industrial VOC gas leakage alarm and portable VOC gas detector.

Features

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.

Specifications

 

Model MQ138
Sensor Type Semiconductor
Standard Encapsulation Bakelite, Metal cap
Target Gas toluene, acetone, alcohol, hydrogen
Detection range 5～500ppm
Standard Circuit Conditions Loop Voltage Vc 5.0V±0.1V DC
Heater Voltage VH 5.0V±0.1V AC or DC
Load resistance RL Adjustable
Sensor character under standard test conditions Heater Resistance RH 30Ω±3Ω（room temp.）
Heater consumption PH ≤950mW
Sensitivity S Rs(in air)/Rs(in 50ppm toluene)≥2
Output Voltage △Vs 0.5V (in 50ppmtoluene)
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； VH:5.0V±0.1V
Preheat time Over 48 hours

 

* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

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