Dip stick resistive liquid level detector with adjustable stop

Details Dip stick resistive liquid level detector with adjustable stop Dip stick resistive liquid level detector with adjustable stop

1987-12-14

1991-01-29

Goldstein, Herbert

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

324696, 73304R, 340620, 340622, G08B 2100

Patent

active

049889753

ABSTRACT:
A fluid level detector comprises a thermoresistive probe and a controlling circuit. The probe replaces the conventional dip stick on internal combustion engines and other machinery having an oil sump and a dip stick tube. The probe comprises an elongated wand of insulative material to which is threaded a length of thermoresistive wire, the resistance of which varies with the amount of immersion thereof into the oil. The circuitry operates various light emitting diodes for alerting operating personnel of the oil level. The probe wire is connected to the circuitry via conductive strips bonded to the wand and conductive elements in contact with the strips and leading to the circuit. An insulative sheath surrounds the wand and strips. A rubber grommet attached to the upper end of the probe seals the machine dip stick tube.

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The National Semiconductor Corporation, LM 1042 Fluid Level Detector, pp. 1 through 7, Aug., 1986, U.S.A.

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