Title: Gas sensitive devices

Abstract: In a system for detecting a gas or vapour by virtue of its effect on the electrical conductivity of a semiconducting material which is maintained at a suitable operating temperature by an electric resistance heater, the heater has an appreciable temperature coefficient of resistance and is connected in a bridge circuit, the current supplied to the bridge being automatically controlled in response to variations of its out-of-balance voltage so as to maintain constancy of the resistance of the heater and hence of the operating temperature.

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Inventors: Wilson, Ronald (Calver, EN)

Application Number: 456217
Filing Date: 1974-03-29
Publication_date: 1976-01-13
Assignee: National Research Development Corporation (London, EN)
Primary Class(es): 324/71.1 73/31.06, 340/634, 422/96, 422/119
Other Classes:
US Patent Ref:

3695848	Oct, 1972	Taguchi	324/71.
3699803	Oct, 1972	Sumi et al.	324/71.

Other Refs:
Primary Examiner: Smith, Alfred E.
Assistant Examiner: Hille, Rolf
Attorney: Cushman, Darby and Cushman