Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-09-01
1989-02-14
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
250231SE, G08B 2100
Patent
active
048049441
ABSTRACT:
Disclosed herein is a Hall-effect liquid level sensing apparatus and method. The device may be mounted on a liquid storage tank and includes at least one float suspended within the tank and floating upon a hollow tube for guidance. The float carries a permanent magnet and a Hall-effect sensor may be reciprocated within the hollow tube to sense the location of the permanent magnet and thereby the location of the float. The device further includes a control device including an optical encoder which enables the device to sense the depth in the hollow tube to which the Hall-effect device has travelled when it senses the height of the permanent magnet. The invention may be used in conjunction with a plurality of floats to determine not only the liquid level but also the level between the liquid and a diverse liquid contained within the same container. In this embodiment, the invention may also be used in conjunction with a specific gravity measuring device so as to ensure that the pressure sensing orifice of the specific gravity measuring device is suspended within the liquid the specific gravity of which is desired to be measured.
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Elder, Jr. Joseph M.
Golladay James D.
Jackson Jill D.
Orsino Joseph A.
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