Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-12-15
1996-07-09
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250903, 340619, 356137, G01N 1506
Patent
active
055347088
ABSTRACT:
A liquid sensing apparatus for a fuel tank comprises a first optical sensor for producing an output having a first state that corresponds to the first optical sensor being exposed to air and a second state that corresponds to the first optical sensor being exposed to fuel; a second optical sensor for producing an output having a first state that corresponds to the second optical sensor being exposed to air or water, and a second state that corresponds to the second optical sensor being exposed to fuel; and a circuit for detecting the first and second optical sensor output states. The sensor circuits can be accessed using a two wire only interface, and thermal stability can be achieved with the electronic circuit as shown.
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Ellinger Sylvester M.
Kline Bruce R.
Le Que T.
Lewis Leonard L.
Romanchik Richard A.
Simmonds Precision Products Inc.
Westin Edward P.
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