Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1977-03-18
1978-10-17
Ruehl, Charles A.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
G01K 712
Patent
active
041202015
ABSTRACT:
A thermocouple temperature measuring circuit has input terminals connectable to the thermocouple to form the cold junctions of the thermocouple. An input amplifier amplifies the thermocouple signal. A cold junction temperature compensation circuit includes means for sensing the temperature of the cold junctions and for providing an output signal which exhibits a predetermined coefficient between cold junction temperature and output signal magnitude. The output signals of the amplifier and compensation circuit are summed at a summing junction and provided to an output amplifier for supply to a temperature indicating meter. A bias means is also coupled to the summing junction for providing a bias suitable for adjusting the magnitude of the output signal in accordance with the low temperature to be indicated on the meter. The gain of the output amplifier may be adjusted so that the variation in output signal responsive to hot junction temperatures is sufficient to drive the meter through the temperature range displayed on the meter.
REFERENCES:
patent: 3461380 (1969-08-01), McGhee
patent: 3903743 (1975-09-01), Noller
patent: 3921453 (1975-11-01), Platzer, Jr.
patent: 3956686 (1976-05-01), Tanaka
Partlow Corporation
Ruehl Charles A.
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