Transcription of Specifying RTDs - Smart Sensors
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Specifying RTDs - Smart Sensors
2003 Smart Sensors , resistance temperature detector (RTD) operates on the prin-ciple that electrical resistance of metal changes as its tempera-ture changes. The resistance of the sensing element increases asthe temperature rises. There are two basic RTD designs wirewound and thin film. Wire wound design is a platinum sensingwire wound into a coil and housed in a ceramic mandrel toprotect the coil. The thin film design consists of platinumdeposited on a ceramic substrate and trimmed to achieve thedesired alpha the construction is then covered with glass andepoxy to protect platinum film.
8 © 2003 Smart Sensors, Inc. signal, reduces measurement distortion. Therefore lighter gauge wire, less expensive, may be used in four-wire RTD applications. RTDs are limited to temperatures of 1200 ° F and because of the
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