Electro-optical liquid level sensor

Details Electro-optical liquid level sensor Electro-optical liquid level sensor

1980-12-19

1982-10-12

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

250577, 73293, 340514, 340641, G08B 2100

Patent

active

043541801

ABSTRACT:
A low liquid level electro-optical probe is made self-checking by providing the same with means for intercepting a portion of the usual light beam and constantly reflecting such portion to the usual receiving electro-optical transducer to constantly generate a low level electrical signal even when the probe is wet. Means are provided for boosting the signal to activate an alarm, failure of which will be indicative of failure or malfunctioning of one or more elements of the system.

REFERENCES:
patent: 3120125 (1964-02-01), Vasel
patent: 3384885 (1968-05-01), Forbush
patent: 3448616 (1969-06-01), Wostl et al.
patent: 3553666 (1971-01-01), Melone
patent: 3882887 (1975-05-01), Nekai
patent: 4134022 (1979-01-01), Jacobsen
patent: 4155013 (1979-05-01), Spiteri

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