Hygrometer with plural measuring bones and redundancy system cir

Details Hygrometer with plural measuring bones and redundancy system cir Hygrometer with plural measuring bones and redundancy system cir

1988-12-20

1990-01-02

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

733365, 340522, 340602, G01R 2726

Patent

active

048915742

ABSTRACT:
A hygrometer of the electrical impedance type includes a sensing element (1) having a porous moisture adsorbing layer (3), the electrical properties of which vary with the quantity of water vapour adsorbed on it sandwich between a substrate (2) and a porous conducting electrode (4). The conducting electrode (4) is divided into a number of separate measuring zones (6A, 6 and 6C) by gaps (5). The hygrometer also includes a redundancy system circuit (7) which is connected to each of the separate measuring zones (6A, 6B and 6C) and which only provides a moisture indication when the output from at least two of the zones (6A, 6B and 6C) are in agreement. This arrangement enables failures of the sensing element (1) to be detected and distinguished from a false moisture indication.

REFERENCES:
patent: 2834201 (1958-05-01), Ohlheiser
patent: 3045198 (1962-07-01), Dolan et al.
patent: 3872419 (1975-03-01), Groves et al.
patent: 4401976 (1983-08-01), Stadelmayr
patent: 4662220 (1987-05-01), Laue

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