what is difference between 3 wire and 4 wire RTD sensor?
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Answer Posted / saravanan
In RTD 2-wire - lead wire resistance can drastically reduce
the accuracy of the measurement by adding additional,
uncompensated resistance into your system.
In RTD 2-wire - Third wire to help the circuit compensate
for lead wire resistance and thus provide a truer indication
of the measured temperature.
In Four wire RTDs we can obtain slightly better
compensation, but are generally found only in laboratory
equiptment and other areas where high accuracy is required.
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