Automatic temperature and humidity regulation – Humidity control
Patent
1995-08-17
1997-02-04
Waynes, William E.
Automatic temperature and humidity regulation
Humidity control
62 34, 7333504, B01F 302, G05D 2100
Patent
active
055989713
ABSTRACT:
The present invention provides a capacitive humidity transducer based humidity control system. The present invention comprises a humidity sensor, a temperature source for the heated cabinet air, a temperature source at the sensor, and a regulated water mist discharged into the cabinet air circulation system. An electronic system combines the input from the sensor, the temperature inputs, and the humidity percentage setting to regulate the timing and duration of the water mist discharge, thereby allowing to adjust percentage of humidity in heated holding cabinets. The sensor is a capacitor comprising two plates in close proximity but insulated from each other. The electrical output of the capacitor is sensitive to moisture on the surfaces between the plates. By cooling one plate until it reaches its dew point, the signal is detected and received by the electronic system. Cooling of the capacitor plate is accomplished by means of a thermoelectric cooler. When cabinet humidity falls below a predetermined threshold value and a corresponding change in capacitance of the capacitive sensor is detected, the humidity control system turns on a water mister to spray water into cabinet air flow until a desired relative humidity level is reached in the heated cabinet.
REFERENCES:
patent: 4237623 (1980-12-01), Timm et al.
patent: 4446780 (1984-05-01), Puvogel et al.
patent: 4605840 (1986-08-01), Koopman
patent: 5343735 (1994-09-01), Succi et al.
Killen Robert H.
Winther Dale E.
Bevles Company, Inc.
Waynes William E.
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