Fluid handling – Liquid level responsive or maintaining systems – Electrical characteristic sensing
Patent
1990-04-12
1991-06-25
Walton, George L.
Fluid handling
Liquid level responsive or maintaining systems
Electrical characteristic sensing
73306, 73313, 137413, 137429, 200 84C, 251 65, 307118, 335206, 361178, 417 40, F16K 3108, F16K 3300, H01H 3518, H01H 3602
Patent
active
050258273
ABSTRACT:
A fluid level controller flexibly set up according to the number of level steps to be controlled and the pitch between such level steps, which comprises a plurality of joint pipes connected in series to form a pipe assembly; a ring-shaped magnetic floating member sleeved on such a pipe assembly to follow fluid level to move up and down; a plurality of reed elements having each a reed switch connected in series with one another and received in the joint pipes; a main control circuit comprising latching relays in quantity one less than the quantity of the reed elements and a plurality of controlled actuators respectively connected to the reed elements.
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patent: 4739786 (1988-04-01), Parkinson
B/W Controls, Inc., "B/W Unifloat Liquid Level Control Systems".
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