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what is difference between 3 wire and 4 wire RTD sensor?
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3 wire rtd sensor have a 1 postive(red) and 2
negative(white).whenever 3 wire rtd used for long distance
that means 10 meter wire..that time wire resistance also
increased.(r=pl/a).in 4 wire rtd sensor have a 2
postive(red) and 2 negative(white).4 wire rtd used for long
distance that time the red and red wire have short.so the
resistance variation is equal.
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