Gas Leak Detection 5
Gas Leak Detection 5 : Types of Gas Detectors: (4) Semiconductor Detectors: Semiconductor sensors detect gases by a chemical reaction that takes place when the gas comes in contact with the sensor. Tin dioxide is the most common material used in semiconductor sensors, and the electrical resistance in the sensor is decreased when it comes in contact with the monitored gas. The resistance of the tin dioxide is typically around 50 k? in air but can drop to around 3. 5 k? in the presence of 1% methane. This change in resistance is used to calculate the gas concentration. Semiconductor sensors are commonly used to detect hydrogen, oxygen, alcohol, and harmful gases such as carbon monoxide. One of the most common uses for semiconductor sensors is in carbon monoxide sensors. They are also used in breathalyzers. Because the sensor must come in contact with the gas in order to detect it, semiconductor sensors work in a smaller range than infrared point or ultrasonic detectors
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