Oil-water interfacial detector

Claim 1

An oil-water interfacial detector, comprising in combination, an instrument including a dip stick attached thereto; said instrument including therein an electrical circuit that has a first portion of said circuit for detecting a water presence below an interface, and a second circuit portion for detecting an oil presence above said interface; said electrical circuit additionally including an attached portion for connection to a pump for pumping out either said water or said oil; said dip stick including a first probe at its lowermost end connected by a first conductor to said circuit, and a plurality of probes vertically spaced apart from each other and said first probe, all said probes protruding from a same side of said dip stick, said plurality of probes each being selectively connected by an individual switch to a second conductor and to said circuit; said circuit including a relay having a contact arm that shifts between a first contact point and a second contact point, said first contact point being in said first circuit portion which includes a green lamp, an alarm and a power source, and said second contact point being in a second said circuit portion which includes a red lamp, an alarm and a power source, said first circuit portion being closed by presence of water between two said probes, and said second circuit portion being closed by presence of electrically non-conductive liquid such as oil between two said probes.