Winsen MQ138 VOC Gas Sensor


In stock

SKU: 1495998
  1.  Detection Gas: acetone, alcohol, hydrogen (H2), toluene
  2. Detection Range: 5~500ppm VOC
  3.  Application: domestic VOC gas alarm, VOC gas leakage alarm, and portable VOC gas detector
  4. Sensitivity S: Rs(in air)/Rs(in 50ppm toluene)≥2
  5. Standard Encapsulation: Bakelite, Metal cap


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Brand: Winsen
Category: Gas and Dust Sensor
Tags: Gas Sensor, VOC gas sensor, Winsen MQ138 VOC Gas Sensor, MQ138 VOC Gas Sensor, Winsen Gas sensor

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.
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.

Applications :

It is widely used in domestic VOC gas alarms, industrial VOC gas leakage alarms, and portable VOC gas detectors.

Package Includes:

1 x Winsen MQ138 VOC Gas Sensor

Model No.


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


Rs(in air)/Rs(in 50ppm toluene)≥2

Output Voltage(V)

≥0.5V (in 50ppm toluene)

Concentration Slope

≤0.6(R200ppm/R50ppm toluene)

Temperature and Humidity


Standard test circuit

Vc:5.0V±0.1V; VH:5.0V±0.1V

Preheat time

Over 48 hours

Weight (g):


Shipping Weight 0.01 kg
Shipping Dimensions 6 × 4 × 3 cm
15 Days Warranty Against Sealed Product

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defect.  Replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

Warranty  Against Sealed Product:

This product comes with manufacturer seal so, warranty Policy shall cover only those issues pertaining to the manufacturing defects in the product. In any other case, No return will be accepted if the seal is broken.

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Country Of Origin: China

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