Question

A thermocouple circuit uses a chromel- alumel thermocouple which gives an emf of 33.3 v when measuring a temperature of 800oc with reference temperature 0oc. the resistance of the meter coil, rm is 50 and a current of 0.1 ma gives full scale deflection. the resistance of the junctions and leads, re, is 12 . calculate:
a.resistance of the series resistance if a temperature of 800oc is to give a full scale deflection.
b.the approximate error due to rise of 1 in re.
c.the approximate error due to rise of 10oc in the copper coil of the meter. the resistance temperature co- efficient of the coil is 0.00426/oc.

Answer 1

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