Abstract: A sensing device for determining the amount of liquid in an oil crankcase of a vehicle. A hollow dipstick, closed at one end and having a metering hole therein, is inserted into the crankcase of a car. The other end of the dipstick is connected by flexible tubing to a suction diaphragm and sensing diaphragm in a sensing module. The suction bellows and sensing diaphragm are linked together and to the dipstick by branches of a T-tubing. An opposed end of the suction diaphragm is connected to a piston of a solenoid. The sensing diaphragm is mounted to move in response to the amount of oil suctioned into the dipstick. An electrical circuit is formed between a push button, a solenoid, ground, and the car battery, such that, when the push button is closed, the solenoid becomes excited, drawing in the piston to thereby move the suction diaphragm. Movement of the suction diaphragm draws oil into the dipstick.

Abstract: A sensing device for determining the amount of liquid in an oil crankcase of a vehicle. A hollow dipstick, closed at one end and having a metering hole therein, is inserted into the crankcase of a car. The other end of the dipstick is connected by flexible tubing to a suction bellows and a sensing bellows in a sensing module. The suction bellows and sensing bellows are linked together and to the dipstick by branches of a T-tubing. An opposed end of the suction bellows is connected to a piston of a solenoid. The sensing bellows is mounted to move in response to the amount of oil suctioned into the dipstick. An electrical circuit is formed between a push-button, a solenoid, ground and the car battery, such that when the push-button is closed, the solenoid becomes excited, drawing in the piston to thereby expand the suction bellows. Expansion of the suction bellows draws oil into the dipstick. An electrical circuit coupled to the sensing bellows indicates if oil is sampled by the dipstick.