(under subclass 403) Apparatus in which the weight or pressure head of the liquid is sensed in a vessel which is separate from the liquid accumulation but is in communication therewith.
(1) Note. Both auxiliary gravitating tanks and stationary devices for measuring a static head are included.
SEE OR SEARCH THIS CLASS, SUBCLASS:
120, for alternate or successively substituted flows from a source with control by filling an auxiliary gravitating tank.
134, for an auxiliary receptacle accumulator for starting a siphon.
154+, for diverse fluid containing pressure system traps,
which are in effect communicating measuring vessels, though not necessarily concerned with level. 393, for level responsive devices including a liquid weight or pressure sensing chamber connected to a tank at the desired liquid level.
