Resistance temperature detectors (RTD’s) use the change in the electrical resistance of a wire wound device with a positive temperature coefficient to signal a change in the temperature. As a standard, Nexthermal uses 100-ohm class B platinum wire-wound elements manufactured to the DIN EN60751 standard (formerly IEC 751). While more expensive, RTDs offer more accurate linear readings than thermocouples. However they have longer response times, are not “tip sensitive”, and are more subject to damage from vibration.
Tube and Wire Construction
This type of sensor offers low-cost construction for a wide range of applications up to 900°F(482° C). A metal tube is used to provide additional protection to the RTD element, which is located at the tip. The standard 304 stainless steel tube is available in 1/8”, 3/16”, and ¼” diameters.
Mineral Insulated Construction
This type of sensor offers a more rugged, shock resistant construction for higher operating temperatures. It is flexible enough to be bent around a mandrel to a radius of twice the outside diameter of the sheath. A compressed mineral insulated powder, usually magnesium oxide (MgO), is used to insulate and protect the wires inside a metal sheath. The sheath material is selected to provide the best corrosion resistance for your application.
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