Gas detectors were developed to detect the presence of certain gases in the air. They are often used in industrial environments to monitor air quality and minimise the risk of explosions, poisoning and other hazards.

There are different types of gas detectors that can react to and measure different gases. The most common gases that can be detected by gas detectors are carbon monoxide, carbon dioxide, methane, hydrogen, nitrogen oxides and sulphur dioxide.

Gas detectors usually work by taking a sample of the ambient air and analysing it. Other detectors work with chemical sensors that react to certain gases and generate a colour change or an electrical voltage, which can then be detected by the gas detector. Still other gas detectors use infrared or ultrasonic sensors that measure the density or speed of sound of the gas to determine its concentration.

Gas detectors are often used in industrial applications to detect the presence of gas leaks and provide a timely warning before dangerous situations occur.