Automatic temperature and humidity regulation – Humidity control
Patent
1989-03-30
1990-03-27
Wayner, William E.
Automatic temperature and humidity regulation
Humidity control
733365, 62176G, B01F 302
Patent
active
049113577
ABSTRACT:
In a humidity measuring part a thermistor or similar temperature sensing element is used, as a humidity sensing element, in a heated state and an electric signal of humidity is obtained as a function of absolute humidity proportional to the water content of the atmosphere in a constant temperature and humidity bath through utilization of a change in the thermal conductivity of moist air. The absolute humidity signal and an absolute humidity set value or a set value of absolute humidity converted from a relative humidity set value through use of a temperature set value are compared, and a humidity control signal is produced in accordance with the result of this comparison. A forced humidifying signal is generated upon turning ON of the power supply, and the generation of this signal is stopped upon occurrence of the humidity control signal. By this, the absolute humidity is controlled to the set value in the range above absolute humidity corresponding to a maximum point of an absolute humidity versus humidity measuring apart electric output curve. The above-mentioned absolute humidity measured and set values are compared and the humidity control signal is produced in accordance with the difference therebetween. Temperature measured and set values are compared and a temperature control signal is produced in accordance with the difference therebetween. The humidity control signal and the temperature control signal thus obtained are used to control the temperature and absolute humidity independently of each other in the ranges above and below the maximum point.
REFERENCES:
patent: 4419888 (1983-12-01), Kitamura et al.
patent: 4658120 (1987-04-01), Fujikawa
patent: 4750545 (1988-06-01), Hile et al.
Shibaura Electronics Company, Ltd.
Wayner William E.
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