Answer Posted / mohammed abbas

thermocouple is active devise and works on seeback effect
prociplal which is manufature by using two dissmillar metal
because of this diffrence in property of diffternt alloy
when join togeather at one end it will give milli volts
when u measure across other end of the terminal and it can
use for the measuring higher range temperatue till max 1300
degree centigarde
RTD is passive devise and positive temperature coefficent
its resistance increse as temperature increses and it made
up of platinum and works on wheatstone bridge principal and
its temprature measuring range is from -270 to max 700 and
acuracy is good and it will act variable arm of wheat stone
bridge

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