Transcription of Specifying RTDs - Smart Sensors
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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.
© 2003 Smart Sensors, Inc. 7 A resistance temperature detector (RTD) operates on the prin-ciple that electrical resistance of metal changes as its tempera-
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