Method of measuring humidity by using an electrochemical cell

Details Method of measuring humidity by using an electrochemical cell Method of measuring humidity by using an electrochemical cell

1991-06-18

1994-01-25

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

20415316, 20415318, 2041531, 204426, 204428, G01N 2726

Patent

active

052813142

ABSTRACT:
In a method of measuring humidity of an oxygen-containing gas by using an electrochemical cell, firstly an voltage is applied across the pair of the electrodes to obtain a characteristic curve between an intensity of the voltage and that of electrical current, the characteristic curve continuously originating from a first flat portion in which a first diffusion limit current generally remains constant within a predetermined voltage range, and ending up in a second flat portion in which a second diffusion limit current generally remains constant within a predetermined voltage range. Secondly each value of the first diffusion limit current and the second diffusion limit current is read out, and an arithmetic ratio of the first diffusion limit current to the second diffusion limit current is calculated to obtain the humidity of the gas.

REFERENCES:
patent: 4851103 (1989-07-01), Usami et al.
patent: 4938847 (1990-07-01), Andrews, Jr. et al.

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