.~ Liquid level responsive indicator, recorder or alarm
DEFINITION
Classification: 137/558
(under subclass 551) Apparatus provided with a visual indicator, audible alarm or recorder which is responsive to the level of the liquid in some part of the apparatus.
(1) Note. An indicator comprises means which has at least an indicating and a nonindicating position, or a plurality of indicating positions, and does not require inspection of the material in the system to establish the distinction.
SEE OR SEARCH THIS CLASS, SUBCLASS:
213+, for whistles used as liquid level responsive indicators in systems involving gas pressure storage over or displacement of liquid.
559, for sight glasses. See (1) Note.
SEE OR SEARCH CLASS
73, Measuring and Testing, 290+, for liquid level and depth gauges, particularly subclass 322.5 for floats, per se.
