Thermo Electric Pyrometer

Pyrometer is an instrument used to measure very high temperatures such as the temperature of a furnace. It worked on the principle of thermo electric effect.
 
A thermocouple o Pt and an alloy of Pt-iridium is usd. Two long wires of these two materials are threaded through fine porcelain tubes and their ends fused together at the bottom. This arrangement is placed in an outer porcelain tube having two terminals at the top.

A moving coil galvanometer can be connected to these two terminals. The thermoelectric current produced can be detected by the galvanometer and the galvanometer scale is calibrated. Pyrometers are common used to check any variation in the temperature of finances in Thermo-electric Pyrometer metallurgy.


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