Thermal measuring and testing – Transformation point determination – Between gaseous and liquid states
Patent
1982-09-20
1985-03-26
Yasich, Daniel M.
Thermal measuring and testing
Transformation point determination
Between gaseous and liquid states
733365, 250574, 356 37, 374163, G01N 2566
Patent
active
045069948
ABSTRACT:
A method and apparatus for determining the dew point or dew point depression which is arranged for unattended operation and is extremely accurate in the vicinity of very small dew point depressions. In addition to measuring present dew point depression, historical records are maintained and the device is arranged to perform a time trend analysis so as to provide for short term future prediction. Output is provided via a voice synthesizer and a radio. Dew point depression is computed by determining the adiabatic change in volume required to produce condensation. The change in volume is produced by rapidly expanding a test chamber. The measurement cycle concludes with a compression step to raise chamber temperature to at least freezing.
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"Tired of Just Reading Results? Let Your Investment Do the Talking, by V. B. Tandon, pp. 160-163 of Design Engineering, (El. Design 24), 11/78.
Class 356-37, Search Card Definition, 11-9-64.
General Signal Corporation
Yasich Daniel M.
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