Method and apparatus for controlling the humidity in a closed ch

Details Method and apparatus for controlling the humidity in a closed ch Method and apparatus for controlling the humidity in a closed ch

1987-06-08

1988-10-25

Miles, Tim

Gas and liquid contact apparatus

Contact devices

Reciprocating

236 44A, 236 44E, 2391022, 261DIG48, G05D 2202

Patent

active

047802545

ABSTRACT:
The humidity within a controlled chamber is detected with a humidity detector and the proportional value, integrated value and differentiated value of the difference between the detected signal and a preset objective value are added to form an operation amount signal. A predetermined period is divided into a spray time during which an oscillator of an ultrasonic humidifier is operated at an amplitude obtaining a predetermined sprayed amount per unit time and a stopping time during which the oscillator cooperated with such small amplitude as to generate no spray. The predetermined period is repeated and the spraying time in each fixed period is adjusted in response to the above mentioned operation amount signal to keep the humidity within the controlled chamber constant.

REFERENCES:
patent: 3443121 (1969-05-01), Weisbrod
patent: 4420113 (1983-12-01), Lacroix
patent: 4546916 (1985-10-01), Tsuaki
patent: 4623969 (1986-11-01), Bensoussan et al.
patent: 4643351 (1987-02-01), Fukamachi et al.

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