RESISTANCE TEMPERATURE DETECTORS (RTDs) Temperature DetectorsFigure 3 shows an RTD protective well and terminal head. The well protects the RTD fromdamage by the gas or liquid being measured. Protecting wells are normally made of stainlesssteel, carbon steel, Inconel, or cast iron, and they are used for temperatures up to 1100°C.Figure 3 RTD Protective Well and Terminal HeadSummaryResistance temperature detectors (RTDs) are summarized below.RTD SummaryThe resistance of an RTD varies directly with temperature:- As temperature increases, resistance increases.- As temperature decreases, resistance decreases.RTDs are constructed using a fine, pure, metallic, spring-like wire surrounded byan insulator and enclosed in a metal sheath.A change in temperature will cause an RTD to heat or cool, producing aproportional change in resistance. The change in resistance is measured by aprecision device that is calibrated to give the proper temperature reading.IC-01 Page 4 Rev. 0
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