Fuel filter unit with water content indicator

Details Fuel filter unit with water content indicator Fuel filter unit with water content indicator

1983-05-26

1985-12-31

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

210 85, 210 961, 340 59, G08B 2100

Patent

active

045624313

ABSTRACT:
Corrosion of a water sensor resulting from the passage of considerable electric current through it while it is in contact with water is prevented in a motor fuel filter equipped for water separation by interrupting or greatly reducing the current passing through the sensor after the sensor has given a signal indicating the presence of water in sufficient quantity to require draining soon. The warning provided to the vehicle driver is maintained thereafter either by a signal storage circuit (flipflop) or by causing current diverted from the sensor to flow through a substitution resistor or a shunt transistor.

REFERENCES:
patent: 3428941 (1969-02-01), Hewes
patent: 4276161 (1981-06-01), Matsui et al.

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