Material level indicating apparatus with status light and extern

Communications: electrical – Condition responsive indicating system – Specific condition

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340615, 200 6121, G08B 2100

Patent

active

052238199

ABSTRACT:
Apparatus for indicating level of material in a vessel that includes a probe for placement in the vessel at a position corresponding to a desired height at which material level is to be detected. Electronic circuitry is coupled to the probe, and is responsive to operating characteristics of the probe for sensing a change of such operating characteristics between a first operating characteristic at which material is spaced from the probe, and a second operating characteristic when material is adjacent to the probe. The electronic circuitry is contained within a closed housing mounted on the probe, and is connected to a source of electrical power positioned remotely of the vessel. A pair of status lamps are positioned on the housing, and are coupled to the electronic circuitry for respectively indicating application of electrical power to the circuitry and detection of one or the other of the operating characteristics at the probe. A reed switch is positioned within the housing, and is responsive to juxtaposition of a magnet externally of the housing for simulating one of the operating characteristics of the probe independently of actual material level at the probe.

REFERENCES:
patent: 4380243 (1983-04-01), Braley
patent: 4392032 (1983-07-01), Roach, II
patent: 4884444 (1989-12-01), Tuckey

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