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Platinum Wirewound Resistance Temperature Detectors Platinum wire wound Resistance Temperature Detectors (RTD) construction consists of very fine high purity Platinum wire wound onto a ceramic core and then hermetically sealed with a glassed coating. The wire used is 99.99% pure platinum which gives excellent mechanical and electrical stability, provides close interchangeability and very little drift with age. Below are standard temperature coefficient curves that are commonly used: European (Din) or
(IEC 751) Alpha = .00385 Ohms/ Ohm/ Degree C We manufacture our RTD's to meet these standard temperature curves and will also produce them with special temperature coefficients to meet our customers needs.  The calibration point of the RTD is close to the end of the lead wire, if you are adding extension leads the connections should be made at this point to maintain the accuracy (special lead length and calibration points are available). When encapsulating the RTD's into a protection tube or some kind of enclosure we recommend using a type of protection around the element to help avoid the pressures that can be caused by different coefficients of expansion. There are types of tubing's in different temperature ranges such as, Polyolifin shrink tubing, Teflon shrink tubing, and Fiberglass braid that can be used. These materials are thin and soft to help keep the element from being crushed by the pressures. exerted. on the RTD. Platinum Resistance Detectors continued
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