Humidity indicator

Details Humidity indicator Humidity indicator

1977-04-08

1978-07-04

Queisser, R. C.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01N 1910

Patent

active

040981215

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.

REFERENCES:
patent: 2542414 (1951-02-01), Jansen
patent: 3204872 (1965-09-01), Whear

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