3 Wire Vs 4 Wire Rtd. A 4 wire rtd adds a fourth wire and works as a true bridge circuit. A resistance temperature detector (rtd) is a temperature measurement device that accurately uses resistance to measure temperature. This 4 wire configuration allows constant compensation for any lead wire issue.
A 4 wire rtd is the sensor of choice for laboratory applications where accuracy, precision, and repeatability are extremely important.
The 4th wire in that cord and plug configuration is an equipment grounding conductor. I am going to test the temperature profile in a laminator used for pv module manufacturing. 3 wire dc feeder is more economical than 2 wire dc feeder for the same power. Intel created a wiring standard for this fan, including the. You can use 2,3,4 wire rtd's on any rtd input no matter how many wires are required. The following table lists the rtd types that. I.e a two wire to four wire simply connect a link from each rtd connection to the two others on the card, if using 3 wire input & 2 wire rtd connect one side of 2 wire. With the 3 wire arrangement, there is 0 error at balance, and the eror term grows ratiometrically with the change in rg.
