Automatic temperature and humidity regulation – Humidity control
Patent
1989-11-27
1991-05-14
Wayner, William E.
Automatic temperature and humidity regulation
Humidity control
733365, 331 65, 324 711, B01F 302, G05D 2100
Patent
active
050149083
ABSTRACT:
A control circuit (1) for use in a humidifier (H). A capacitor functioning as a humidity sensor (55) includes a sulphonated fluorocarbon material acting as the dielectric (57) of the capacitor. The material is sandwiched between sheets (59a, 59b) of a screen material which act as plates of the capacitor. An RC oscillator (53) has a variable frequency output and incorporates the capacitor. Changes in the dielectric value of the material due to sensed changes in humidity produce changes in the oscillator output frequency. A DC voltage is supplied to the oscillator. The amount of voltage impressed on the sensor at relatively high-humidity levels is controlled to prevent leakage currents caused when the material is exposed thereto. The generation of such leakage currents otherwise adversely effects sensor operation. Operation of the circuit to control operation of the humidifier is also described.
REFERENCES:
patent: 3942718 (1976-03-01), Palmieri
patent: 4546916 (1985-10-01), Tsuaki
patent: 4662220 (1987-05-01), Lave
patent: 4683904 (1987-08-01), Iltis
patent: 4816748 (1989-03-01), Tazawa
Emerson Electric Co.
Wayner William E.
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