Humidity and dew point detector

Details Humidity and dew point detector Humidity and dew point detector

1986-10-14

1989-01-31

Stephan, Steven L.

Thermal measuring and testing

Transformation point determination

Between gaseous and liquid states

733365, 338 35, 236 44E, G01N 2502

Patent

active

048012114

ABSTRACT:
A humidity detector using a ceramic sensor and a heater to periodically clean the sensor. The output of the sensor is sampled and held while the heater is on. When the detector is turned on, the heater is not started until the sensor has been sampled and held. The timer controlling this operation can be externally reset. When the ceramic sensor is temperature corrected, the humidity output indicates a dew point at a fixed temperature. By adjusting this fixed temperature dew point output according to a sensed temperature, the dew point can be detected.

REFERENCES:
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patent: 4208910 (1980-06-01), Lezius
patent: 4335293 (1982-06-01), Kobayashi et al.
patent: 4379406 (1983-04-01), Bennewitz et al.
patent: 4386336 (1983-05-01), Kinomoto et al.
patent: 4419021 (1983-12-01), Terada et al.
patent: 4419888 (1983-12-01), Kitamura et al.
patent: 4462930 (1984-07-01), Suzuki et al.
patent: 4501147 (1985-02-01), Niwa
patent: 4594569 (1986-06-01), Fukushima et al.

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