Gas Detector


MQ7 Carbon monoxide sensor- semiconductor CO sensor

MQ7 Carbon monoxide sensor- semiconductor CO sensor

semiconductor CO sensor Introduction

Semiconductor-based carbon monoxide (CO) sensors, especially those tailored for CO detection, occupy a pivotal position in the realm of gas sensing technology. These sensors serve as a crucial safeguard in safeguarding human safety and preserving ambient air quality. By meticulously detecting even the slightest traces of CO, a dangerously poisonous gas that is nonetheless invisible and odorless, these devices offer invaluable protection against the harmful effects of incomplete combustion of fossil fuels. Their precision and reliability make them indispensable in a wide range of applications, from industrial safety systems to residential alarm systems, ensuring that the environment remains safe and healthy.
The operation principle of a semiconductor sensor relies on chemisorption—the chemical bonding of CO molecules to the surface of the metal oxide layer. As CO molecules interact with the surface, they either donate or accept electrons, altering the number of free charge carriers within the semiconductor. This change results in a measurable variation in the sensor’s resistance, which is then translated into a detectable signal.

Gas sensor Features

  1. High Sensitivity: CO sensors exhibit high sensitivity to low concentrations of CO, making them suitable for early detection and warning systems.
  2. Low Cost: The manufacturing process of MOS sensors is relatively simple and cost-effective, allowing widespread use across various applications.
  3. Durability: With proper encapsulation and temperature control, these sensors can withstand harsh environmental conditions and have a long operational life.
  4. Miniaturization: Miniaturization of semiconductor sensors can make it, join the compact portable devices.
  5. Versatility: They can detect a variety of gases by modifying the composition of metal oxides.


1.Home appliances such as gas boilers, water heaters, and fireplaces for safety monitoring. 2.Indoor air quality monitors for residential and commercial buildings. 3.Automotive industry for vehicle exhaust emission control and cabin air monitoring. 4.Industrial safety equipment for detecting leaks in chemical plants, refineries, and mines. 5.Environmental monitoring to assess air pollution levels.

Gas sensor parameters

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