RTD sensor, Pt100, Pt1000
TE, RTD inside an instrument circle. Resistance temperature detectors are the dominant primary element below 600 °C because they drift less than thermocouples and offer better accuracy.
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How it’s drawn.
An instrument circle carrying TE, sometimes noted RTD, with the loop number below. Like any temperature element it sits at the process connection, usually inside a thermowell, and runs a line to its transmitter or indicator. The bubble looks the same as a thermocouple bubble. The element type is carried on the datasheet.
Typical usage.
Reactor jacket temperatures, BPCS regulatory loops, anywhere accuracy matters more than maximum operating temperature. 3-wire and 4-wire connections compensate for lead-wire resistance.
Telling it apart.
- An RTD bubble and a thermocouple bubble read the same on the drawing. The difference lives on the datasheet, not the symbol.
- TE is the element. TT is the transmitter. They are separate symbols joined by a signal line.
- The thermowell drawn at the wall is the pocket, not the sensing element inside it.