The thermocouple J shown in Fig. 1-2 is used to measure the temperature of a fro

Question

The thermocouple J shown in Fig. 1-2 is used to measure the temperature of a frozen biological sample at -3 degree C. Using the thermocouples tables provided on the next page, determine the voltage generated between the junctions a-b. The resistance temperature device (RTD) R_T has alpha_0 = 0.005/degree C, dissipation constant PD = 30mW/degree C, and resistance = 500 Ohm at 20 degree C. If the isothermal block is at 10 degree C, and the 400 Ohm potentiometer is at its mid-point position, determine the voltage E between the junctions c-d. The RTD is used as an external reference junction without an ice bath. Briefly explain which thermocouple law is being applied in this measurement setup? The following tables give the output voltage of several thermocouple (TC) types over a range of temperature in 5 degree C increments. In each case, the TC reference temperature is 0 degree C. The first-named material will be the positive terminal, as iron-constantan; the iron will be the positive lead when the reference temperature is lower than the measurement. The temperature is in degree C, and the output is mV. Each column is in 5 degree C increments from the temperature of that row.

Explanation / Answer

th following table gien in the output og voltage

200 9.288 9.555.10.098 13.56 15.35

340 17.147 18.13 18.134 19.134 19.

250 13.23 13.134 1.134.45.234.34.3

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