Title: Humidity indicator

Abstract: A humidity indicator with a housing having mounted therein a sensing element that changes dimensionally in response to humidity variations. A flexible diaphragm is captively held within the housing and is moved by dimensional changes of the sensing element. An intermediate plate with a cavity forms a reservoir on the flexible diaphragm for a transduction fluid. An adjustable member received within the sensing element contacts a portion of the flexible diaphragm bounding the reservoir for initial calibration of the humidity indicator. A dial and cover assemblage having an internal capillary groove is mounted on the intermediate plate, a port interconnecting the reservoir and capillary groove. The transduction fluid within the reservoir flows into the capillary groove and provides an indication of the percent of relative humidity.

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Inventors: Captain, Khushroo M. (Cambridge, MA, US)

Application Number: 786006
Filing Date: 1977-04-08
Publication_date: 1978-07-04
Assignee: Foster-Miller Associates, Inc. (Waltham, MA)
Primary Class(es): 73/335.11
Other Classes:
US Patent Ref:

2542414	Feb, 1951	Jansen	73/406.
3204872	Sep, 1965	Whear	73/337.

Other Refs:
Primary Examiner: Queisser, R. C.
Assistant Examiner: Appleman, John S.
Attorney: Morse, Altman, Oates & Bello