Gas sensor with multiple exposed active elements

Details Gas sensor with multiple exposed active elements Gas sensor with multiple exposed active elements

1997-06-11

1998-11-03

Williams, Hezron E.

Measuring and testing

Gas analysis

Gas of combustion

73 2503, 7333502, 73 232, 324610, G01N 2532, G01N 2718, G08B 1710

Patent

active

058311467

ABSTRACT:
A combustible gas detector or sensor having catalytic coated resistance sensing elements that uses a wheatstone bridge to sense the presence and concentration of any combustible gases in a gas stream that chemically react with such catalytic coatings. Wherein there is a power supply node electrically coupling one end of a first and second bridge of the wheatstone bridge. There is a ground node electrically coupling the first and second bridge at another end. There is a first and second metered node located on the first and second bridge respectively. There is a first catalytic sensor element, located on the first bridge between the power node and first metered node. There is a second catalytic sensor element, located on the second bridge between the ground node and second metered node. There is a first reference sensor element, located on the first bridge and in series with the first catalytic sensor element, and coupled between the first metered node and the ground node. Finally, there is a second reference sensor element, located on the second bridge and in series with the second catalytic sensor element, and coupled between the second metered node and the power node the geometry and design of the gas detector has the two catalytic sensing elements and two reference sensing elements being spatially separated and positioned on a base capable of being rotated along an axis so that as the base rotates about the axis the heated gas stream will not contact the first and second reference sensing elements.

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