A single-junction type E thermocouple is used with a computer-controlled data ac

Question

A single-junction type E thermocouple is used with a computer-controlled data acquisition (DAQ) system to record temperature of a test object. The DAQ features 'on-board cold junction compensation' (CJC sensor) which is designed to supply a zero-volt reference for the thermocouple, thus elimination the need for a dual-bead thermocouple and ice-water bath reference. Foe one test a voltage of 5.981 mv is indicated, what is the temperature of the test object? During second test a malfunction occurs in the CJC sensor, resulting in an abnormally high reading of 160 degree C on the test part. If the actual temperature is unchanged from the temperature value indicated in part (a) of this problem, what -zero voltage is being supplied at the CJC sensor?

Explanation / Answer

part1)

5.981 mV voltage lies between 70oC - 80oC

part 2)

at 160oC voltage =10.50025 mV

but reference voltage is now 5.981 mV in stead of 0V

so Voltage at 160oC = 10.50025 mV +5.981 mV =16.48125 mV

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