Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1980-03-17
1981-10-13
Woodiel, Donald O.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73362AR, G01K 716
Patent
active
042941156
ABSTRACT:
A measuring device, for practically simultaneous measurement of a temperae difference and an absolute temperature, with temperature precision resistors for the temperatures. Both temperature precision resistors, along with a reference resistor, are arranged in parallel, with time switches provided in the current supply lines thereof, with the aid of which these resistors are sequentially supplied from a common constant power source with equal current pulses during predetermined time intervals. Condensers or capacitors are provided in parallel to the individual resistors and are sequentially charged, with the aid of a time window switching during time intervals lying within the current pulse time intervals over sense lines and differential switches to the pulse voltages which fall at the resistors. By switches for the transfer of the voltage differences between the capacitors, and within a subsequent time interval, to capacitors grounded on one side, there are obtained voltage values which are a measure of the temperature differential. A zero adjustment of the differential time output may be provided by applying a small fixed correction current to one precision resistor, and an adjustable small correction current to the other precision resistor.
REFERENCES:
patent: 2976729 (1961-03-01), Smith
patent: 3950991 (1976-04-01), Grass
Kernforschungsanlage Julich Gesellschaft mit beschrankter Haftun
Woodiel Donald O.
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