2-Wire RTD Formula


#1

2-Wire RTD Formula

The wire resistances R2 and R3 are inevitably included in the measured value. Wire resistance can be cancelled by calibration, but just at one specific temperature of the wire (often room temperature).

where

  • Rpt is Resistance of RTD
  • R2 is Resistance of first lead wire (Extension cable used to connect RTD)
  • R3 is Resistance of second lead wire (Extension cable used to connect RTD)
  • L2 & L3 are extension cable leads