Optical liquid level sensor and discriminator

Details Optical liquid level sensor and discriminator Optical liquid level sensor and discriminator

G - Physics

01

F

G01F 23/28 (2006.01) G01F 23/292 (2006.01) G01N 21/47 (2006.01)

Patent

CA 2138235

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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