Diaphragm (remote) seal with capillary

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

Drawn as

A small flat seal on the pipe or vessel nozzle (a short rectangle with a curved diaphragm line), joined to a transmitter bubble by a capillary (a line with × marks).

Meaning

Remote seal protecting a transmitter from corrosive, viscous or hot process fluid. Part of the transmitter; model the transmitter only.

Variants

Some legends write "DS" or "SEAL" beside the instrument