Humidity measuring method

Details Humidity measuring method Humidity measuring method

1980-05-09

1983-12-13

Swisher, S. Clement

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73 27R, G01W 102, G01W 2518

Patent

active

044198884

ABSTRACT:
A current is applied to a thermistor or like heat sensitive element having a temperature-resistance characteristic to heat the heat sensitive element up to a temperature above the open air temperature and the heat sensitive element is held in the open air. Since the resistance value of the heat sensitive element varies with the amount of water vapor contained in the open air, the change in the resistance value is detected, from which the humidity of the open air is obtained. By temperature compensation, direct reading of absolute or relative humidity is made possible.

REFERENCES:
patent: 1701181 (1929-02-01), Gross
patent: 1855774 (1932-04-01), Schneider
patent: 2077538 (1937-04-01), Wait
patent: 2116239 (1938-05-01), Hebler
patent: 2205306 (1940-06-01), Olshersky
patent: 3184953 (1965-05-01), Petrocelli
patent: 3187558 (1965-06-01), Koncen et al.
Daynes, H. A., Gas Analysis by Measurement of Thermal Conductivity, Cambridge University Press, 1933.

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