Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1989-11-13
1991-08-20
Williams, Hezron E.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
324694, 338 35, G01N 2556
Patent
active
050404172
ABSTRACT:
The disclosure relates to a system for measuring relative humidity and temperature wherein there are provided three controlled switching matrices, a first of the matrices determining whether a current for determining temperature or relative humidity is to be fed via a diode to a system voltage output from when the voltage output will be converted to an appropriate temperature or relative humidity reading. The remaining two matrices are each controlled by an oscillating voltage which alternates the output or input terminal thereof depending upon whether the oscillating voltage is positive or negative. This causes current to be passed through a humidity responsive resistor in opposite directions during each half cycle of the oscillating voltage. In the case of humidity sensing, the diode used for measuring temperature also acts as a temperature compensating device for the humidity sensor, thereby having a dual function in the system.
REFERENCES:
patent: 3196682 (1965-07-01), Johnson, Jr.
patent: 3797312 (1974-03-01), Campbell
patent: 4379406 (1983-04-01), Bennewitz et al.
patent: 4816748 (1989-03-01), Tazawa et al.
Roskos Joseph W.
Williams Hezron E.
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