Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1998-05-08
2000-07-11
Gutierrez, Diego
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
374 44, 374142, 374148, 374164, 7320424, G01N 2518, G01N 702, G01P 510
Patent
active
060862513
ABSTRACT:
A process for operating a thermocouple (2), which is arranged in a gas atmosphere and is maintained at a working temperature that is increased compared with the gas temperature by means of an a.c. power source (11). The determination of the thermal power introduced into the gas atmosphere and the temperature measurement are made possible with one measuring element. The thermocouple voltage is compared with a predetermined reference voltage U.sub.B arising from the working temperature of the thermocouple, a difference signal is formed between the thermocouple voltage and the reference voltage U.sub.B, and the a.c. power source (11)is influenced with the difference signal such that the thermocouple voltage is maintained at a constant value relative to the reference voltage U.sub.B.
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Hastings, C. E., "A new type instrument for measuring air velocity", AIEE Winter meeting paper 49-23, Dec. 1948.
Drager Medizintechnik GmbH
Gutierrez Diego
Pruchnic Jr. Stanley J.
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