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. Thin films are manufacturedmuch in the same way as computer chipsThe metal that is employed in a RTD must change resistancewith respect to temperature and provide stability and a highoutput. The three metals that best exhibit these characteristicsare:PlatinumThe stability and linearity of this metals resistive output over abroad range makes it the best metal for process type RTD can withstand oxidation and is effective over a rangeof 200 to + 850 degrees C.
Specifying RTDs Ceramic mandrel with internal bores to house coils Platinum sensing wire ... accuracy for Platinum 100 ohm RTD elements. They are Class B, the standard in the process industry and the higher accuracy ... 100 ohm Platinum .39 ohms .22 ohms 200 ohm Platinum …
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