Optical fuel/air/water sensor and detector circuit
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United States of America Patent
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Jul 9, 1996
Grant Date -
N/A
app pub date -
Dec 15, 1993
filing date -
Dec 15, 1993
priority date (Note) -
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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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