Why and where do we use seal pots and condensate pots in level transmitters?

Seal pots or condensate pots are used to provide buffer volume of liquid for impulse lines where wet leg measurement is used. Small quantities of draining from these lines produces very small changes in head pressure and therefore reduces errors compared to the case when no seal pots are used.

Also in many seal pots it is possible to fill liquid into the impulse line when the line is completely drained.