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Winsen

Winsen MQ138 VOC Gas Sensor

Name: Winsen MQ138 VOC Gas Sensor
Brand: Winsen
SKU: 1495998
Price: 3270 INR
Availability: InStock

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AI Summary

Gas Sensors for everyday users

The Winsen MQ138 VOC Gas Sensor by Winsen is a mid-range gas sensors designed for everyday users. It features Item Type: Gas Sensor and Model No. / Name: MQ138.

₹3,270

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Quantity

Total: ₹3,270

Buying tip: A quality investment for dependable performance and premium build quality.

Estimated delivery: 24 Aug – 7 Sept

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Quick Specs

Item Type: Gas Sensor

Model No. / Name: 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

Ideal For

Electronics projectsArduino / Raspberry Pi buildsPrototyping

SKU: robu-1495998Category: Gas Sensors

About This Product

The Winsen MQ138 VOC Gas Sensor by Winsen is a mid-range gas sensors designed for everyday users. It delivers reliable performance at an accessible price.

Key Specifications

Item Type: Gas Sensor
Model No. / Name: MQ138
Target Gases: toluene, acetone, alcohol, hydrogen
Heater Voltage: 5.0V±0.1V AC or DC VH — works with standard household power
Load Resistance: Adjustable RL
Heater Resistance: 29Ω±3Ω（ room tem.）RH
Heater power consumption: ≤900mW PH
Sensitivity: Rs(in air)/Rs(in 50ppm toluene)≥2

Why Buy from Elecvora?

Elecvora sources this product directly, cutting out multiple middlemen. Every order includes free shipping, a 15-day return policy, and secure payment via Razorpay.

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

Setup Guide

Identify the pins

Locate VCC (power), GND (ground), and data pins (SDA/SCL for I2C, MOSI/MISO for SPI, or TX/RX for UART). Refer to the pinout diagram on the product page.

Wire to your microcontroller

Connect VCC to 3.3V or 5V (check the module spec), GND to GND, and data pins to the appropriate GPIO pins on your Arduino or Raspberry Pi.

Install libraries

In Arduino IDE, go to Sketch → Include Library → Manage Libraries and search for the sensor library. Install the recommended version.

Upload example sketch

Open File → Examples → [library name] → Basic Example. Upload to your board and open Serial Monitor to view output.

Calibrate if needed

Some sensors (temperature, humidity, distance) may need a short warm-up period or calibration. Run the calibration sketch if provided.