Magnetic level gauge

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

Drawn as

A chamber beside the vessel on two nozzles, with a float inside and a column of indicator flaps (half-filled marks) on its face, and an LG bubble.

Meaning

Float-and-magnet level indicator on a bypass chamber, readable from a distance. Often carries a level transmitter too. Becomes magnetic-level-gauge.

Variants

Often drawn exactly like a gauge glass and tagged LG; the datasheet tells them apart
A clamp-on magnetostrictive LT on the chamber is drawn as a separate LT bubble