Transcription of Chapter 3 Catalytic Combustible Gas Sensors
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Chapter 3 Catalytic Combustible Gas Sensors
37 Chapter 3 Catalytic Combustible Gas SensorsChapter 3 Catalytic CombustibleGas SensorsCatalytic bead Sensors are used primarily to de-tect Combustible gases. They have been in usefor more than 50 years. Initially, these sensorswere used for monitoring gas in coal mines, wherethey replaced canaries that had been used for a longperiod of sensor itself is quite simple in design and iseasy to manufacture. In its simplest form, as used inthe original design, it was comprised of a single plati-num wire. Catalytic bead Sensors were produced allover the world by a large number of different manu-facturers, but the performance and reliability of thesesensors varied widely among these various manufac-turers. A Catalytic bead sensor is shown in Figure of OperationCombustible gas mixtures will not burn until theyreach an ignition temperature. However, in the pres-ence of certain chemical media, the gas will start toburn or ignite at lower temperatures. This phenom-enon is known as a Catalytic combustion.
39 Chapter 3 Catalytic Combustible Gas Sensors in a square. The source of the electrical current is con-nected, and between the other pair of opposite cor-ners, the output measurement circuit is connected.
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