Displacer level transmitter

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

Drawn as

An external cage beside the vessel on two nozzles, with a long slender displacer hanging inside from a torque tube at the top, and an LT bubble.

Meaning

Buoyancy (displacer) level or interface transmitter. Classic on separators for oil/water interface. No dedicated component; model it as a level transmitter note on the vessel.

Variants

Internal displacers (inside the vessel) are drawn as the displacer inside the vessel outline
Interface service may be tagged LDT or LT with "INTERFACE"