Thermowell with temperature element / transmitter

ISA 5.1-2009/2022 (primary element symbols) / PIP PIC001

Drawn as

A U-shaped pocket dipping into the line (the thermowell), with a line up to a TT or TE bubble.

Meaning

Temperature measurement: a thermowell (TW), an element (TE, an RTD or thermocouple) and a transmitter (TT). Model one temperature-transmitter for the loop.

Variants

Some legends draw the well as a short line into the pipe with a dot
A test thermowell (TW only, no TE) is for a portable probe; skip it
Some legends show a flanged thermowell connection as two short bars (a flange pair) on the branch to the bubble, with the connection size written beside it