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Title: Combustible Gas And Flame Monitoring Techniques
Author: Tom Aoki
Source: 1999 Appalachian Gas Measurement Short Course
Year Published: 1999
Abstract: Uses reference and active beads as part of its detection principal. The reference bead is encapsulated by inert material preventing outside air from contacting metals impregnated within the bead. A thin wire supplies current to the reference bead and the reference voltage stays constant even in the face of changes in air temperature, relative humidity concentrations, and atmospheric pressure. The output wire from the reference bead feeds one half of a wheatstone bridge circuit. The active bead is not encapsulated and is exposed to contact from ambient/outside air A thin wire supplies current to the active bead. The output wire from the active bead is also connected to the same wheatstone bridge circuit as the reference bead wire. Air that is free of any combustible gases) will give an active bead output voltage equal to that of the reference bead and the wheatstone bridge circuit will be balanced. In this state the bridge circuit output will be zero and will read 0% LEL concentration.

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