Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1977-05-26
1980-01-08
Goldstein, Herbert
Measuring and testing
Gas analysis
Moisture content or vapor pressure
235200R, 236 44C, G01K 1700
Patent
active
041821807
ABSTRACT:
An enthalpy comparator for comparing the enthalpies of two bodies of air is disclosed having a first temperature sensor and a first humidity sensor for sensing the temperature and humidity respectively of the first body of air, a second temperature sensor and a second humidity sensor for sensing the temperature and humidity respectively of the second body of air, and a diaphragm module unit having a first diaphragm defined chamber connected to the first temperature sensor, a second diaphragm defined chamber connected to the second temperature sensor, a third diaphragm defined chamber connected to the first humidity sensor, and a fourth diaphragm defined chamber connected to the second humidity sensor, and an output sensing mechanism associated with the four chambers for providing an output dependent upon the enthalpies of the first and second bodies of air, and, in particular, the difference between the enthalpies of the first and second bodies of air. The areas of the diaphragms which define the first, second, third and fourth chambers are selected to yield a close approximation of the enthalpies of the two bodies of air.
REFERENCES:
patent: 2494673 (1950-01-01), Smith
patent: 3059846 (1962-10-01), Vesper
patent: 3463442 (1969-08-01), Lesklewicz et al.
patent: 3913344 (1975-10-01), Holloway et al.
Mamzic, "Using Pneumatic Analog Computing Elements for Control" in Control Engineering, 9/61, pp. 105-110.
"12 Ways of Generating Control" in Control Engineering, 9/54, pp. 58-62.
Goldstein Herbert
Honeywell Inc.
Joike Trevor B.
LandOfFree
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