Gas Sensors. How Stuff Works

Gas Sensors are devices which detects the presence of gases in an area. These are used for safety purposes to activate alarm systems as warning measure or to shut down a machinery. Gas detectors are used to detect different kinds of gases like combustible, flammable and toxic gases. These are also find application in the detection of oxygen depletion in an area. As the gas sensors measure a particular concentration of gas, the sensor responds to a calibrated gas and serves as a point or scale. As the level of gas increases above the sensor’s calibrated level, the alarm will be activated. Individual sensors are usually used to detect particular gases, but sensors capable of detecting various kinds gases are also available.
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Familiarize Electronic Components Part XVIII – Gas Sensors

Gas sensor is the device used for detecting the presence of Gases like Carbon monoxide, LPG, Ethanol, Toluene, Hydrogen etc. These are used as safety measures in work places and Home to avoid hazardous situations. The sensor can be used to generate an alarm or to activate a system to shut down the gas flow. Gas detectors are usually battery operated devices and if the gas level exceeds the preset level, it sends output signal to activate the circuit. Most commonly used gas sensors are LPG sensor, Smoke sensor and Alcohol sensor used in Breath analyzer.

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