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As known the RTD sensors are linear sensors. PT100 is an RTD sensor having100 Ohm at0 C.
Approximately the resistance of the RTD =100 + (0.39*T)
If the temperature is20 C, the resistance of the PT100 will be approximately =107.8 Ohm so that can be checked without special equipment! Just by Ohm meter.
Also rember number of wires2 or3 or4 if rtd3 wire2 terminal are the resistance it, s self it will measure ohms with u "sometimes called compensation terminals" the other terminal will read short circuit with only one terminal
Don, t forget that cable length will be subtracted from the total resistance
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