Patent ID: 11951961
Assignee: ZF ACTIVE SAFETY GMBH
Field: Measurement (Instruments)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A method for testing a fluid level indicator within a reservoir comprising the steps of:
providing a fluid reservoir having first, second and third chambers, the third chamber being formed by a main chamber and a guiding chamber in fluid communication with the main chamber;
providing and maintaining a first sensing element in the guiding chamber;
providing a plunger in a first retracted position within a plunger chamber;
moving the plunger from the first retracted position to a second extended position to exhaust the fluid from the plunger chamber into the fluid reservoir;
moving the plunger from the second extended position back towards the first retracted position thereby generating a negative pressure in a fluid passageway which connects the third chamber of the reservoir to the plunger chamber so a fluid flow stream is generated from the third chamber to the plunger chamber, the fluid flow stream directly drawing the first sensing element vertically downward within the guiding chamber toward the fluid passageway such that the first sensing element moves vertically downward in the guiding chamber relative to an upper surface of the fluid in the guiding chamber; and
generating a signal via the first sensing element and a second sensing element as the first sensing element moves vertically relative to the second sensing element and transmitting the signal to at least one of a control unit or a graphical user display.