Optical liquid level indicator and method

Details Optical liquid level indicator and method Optical liquid level indicator and method

1985-04-04

1987-06-02

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73327, G01F 2302

Patent

active

046706607

ABSTRACT:
An optical liquid level sensor utilizing both a prismatic member for the light refraction when immersed in and surrounded by a liquid and its effects for the indication of the presence and absence, selectively, of the liquid level. This level indication is provided in the subject case through a target plate bearing letter codes and legends, respectively, which are recognized and standardized in this trade and which become visible at the onset and for the duration of an acceptable liquid level situation; otherwise; a messageless image appears in the sensor. The illuminated target plate allows also for the observation of the color and any color change of the liquid and the taking of remedial actions.

REFERENCES:
patent: 3345870 (1967-10-01), Yoshinaga
patent: 3435681 (1969-04-01), Stanley
patent: 3570311 (1969-03-01), Nelson
patent: 3796098 (1974-03-01), Trayer
patent: 3893339 (1975-07-01), Melone
patent: 4201086 (1980-05-01), Jones

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