Semiconductor CO gas sensor – MQ7 Carbon monoxide sensor


Semiconductor CO gas sensor Introduction

Semiconductor CO gas sensor is a carbon monoxide sensor developed by the semiconductor gas detection principle. Semiconductor CO gas sensor uses semiconductor materials as gas-sensitive materials, using the physical properties such as the conductivity of the semiconductor when in contact with carbon monoxide gas to detect the composition and concentration of carbon monoxide gas. Semiconductor gas sensor has the advantages of high sensitivity, fast response time and recovery time, long service life and low price.

Semiconductor CO gas sensor

Semiconductor CO gas sensor Features

1, the machine is small in size, light in weight, easy to install, can be mounted in portable, fixed, pipe type and other appearance sensors used.

2, stainless steel protective net, high protection, easy to clean effective protection from particulate matter and impurities, easy to maintain and use.

3, high-performance chip, breakthrough manufacturing process, product performance significantly improved.

4, long service life, low cost, simple driving circuit.

5, high resolution, high sensitivity, fast response speed, strong anti-interference force.

MQ7 Carbon monoxide sensor

Semiconductor CO gas sensor Parameters

Detection gas: carbon monoxide

CO detection range: 10-500ppm

Product type: semiconductor gas sensor

Standard package: Plastic seal

Loop voltage: ≤24V DC

Load resistance: adjustable

Temperature/humidity: 20°C, 2°C; 55% soil 5%RH


1. Avoid exposure to volatile silica vapors.

2, avoid sensor exposure to high concentration of corrosive gas.

3, avoid alkali, alkali metal salt, halogen pollution.

4, avoid the sensor contact with water or immersed in water, easy to cause the sensor sensitivity characteristics decline.

5, avoid applying too high voltage, if the voltage applied to the sensor heating is higher than the specified value, even if the sensor has not received physical damage or damage, it will cause damage to the lead/or heater, and cause the sensor sensitive characteristics to decline.

Carbon monoxide sensor



Carbon monoxide is a carbon-oxygen compound with a chemical formula of CO. It is usually a colorless, odorless, and tasteless gas. At the same time, it is toxic. Higher concentrations can cause people to have different levels of symptoms of poisoning, harm the human brain, heart, liver, kidney, lung, and other tissues, and even death by electric shock. The minimum lethal concentration of human inhalation is 5000 ppm (5 minutes).


Coking, ironmaking, and other production processes in the metallurgical industry

Synthetic ammonia, methanol, and other production processes in the chemical industry

Mine blasting and coal mine gas explosion accidents

Exhaust emissions from vehicles and other vehicles

Incomplete combustion of fuel in the boiler

Gas or liquefied gas pipeline leaks from coal stoves in family rooms, natural disasters such as volcanic eruptions, forest fires, earthquakes, etc.


Carbon monoxide is an atmospheric pollutant. It is the most abundant and widely distributed in the atmosphere. It is the product of incomplete combustion of carbonaceous materials such as coal and petroleum.


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