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Title: Gas Detection In The Natural Gas Transmission And Petroleum Products Pipeline Industries
Author(s): [Not Available]
Source: 2000 Appalachian Gas Measurement Short Course
Year Published: 2000
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

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