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An instrument bubble tagged for level transmission.
Also known as: LT instrument symbol, Level measurement transmitter
On a piping and instrumentation diagram a bubble tagged LT denotes a level transmitter, measuring the height of liquid in a vessel and sending the value onward.
Denotes an instrument measuring liquid level and transmitting the value as a signal.
Contexts: Technical drawing
Is drawn attached to the vessel rather than to a line, which is how a reader distinguishes a level measurement from a flow one at a glance.
Contexts: Technical drawing
An instrument circle containing the letters L and T above a loop number, connected to a vessel.