Patent Number: 6,293,145

Title: Sensor for accurate measurement of levels in irregularly shaped tanks

Abstract: A sensor for measuring the filling level of a fluid in a vessel, in particular fuel tank is disclosed. The sensor has an electrode group which extends vertically over the fillable vessel height, and dips into the fluid and which forms electrical capacitors whose capacitances change in a measurable fashion when there are changes in the filling level. The capacitances are determined by a connected evaluation circuit and are represented as a signal which describes the filling level. There is at least one measuring electrode which extends over the entire fillable vessel height. A plurality of reference elements are arranged at different reference heights within the fillable vessel height. Optionally, a plurality of measuring electrodes are arranged in such a way that each measuring electrode has a significant change in width at a reference height assigned to it, and wherein the entire fillable vessel height is passed over by the measuring electrodes. An advantageous method for measuring the filling level is also disclosed.

Inventors: Wallrafen; Werner (Hofheim, DE)

Assignee: Mannesmann VDO

International Classification: G01F 23/26 (20060101); G01F 23/22 (20060101); G01F 023/00 ()

Expiration Date: 09/25/2018