Question

A thermocouple circuit uses Chrome - Alumel which gives an e.m.f of 33.3 mV when measuring a temperature of 800 oC with reference temperature of 0 oC. The resistance of the metal coil is Rm = 50 Ω and current of 0.1 mA gives a full scale deflection. The resistance of the junction and leads Re = 12 Ω. Determine, i. Resistance of the series resistance if a temperature of 800 oC is to give full scale deflection ii. The approximate error due to rise of 1Ω in Re iii. The approximate error due to rise of 10 oC in a copper coil of the meter. The resistance temperature coefficient of the coil is 0.00426 /oC

Answer 1

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