Patent · US Expired

Method and apparatus for sensing liquid level using baseline characteristic

US7360418B2 · kind B2 · utility

103Cited by
31References
28Claims
0Family size

Assignee

Inventor

Key dates

Filing dateJun 28, 2005
Grant dateApr 22, 2008
Priority date—
Expiry dateOct 3, 2025

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01F23/243
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A liquid level sensing arrangement using a probe uses a baseline probe circuit characteristic, e.g., a circuit resistance or voltage, that is measured when the probe is out of contact with the liquid in the tank. The baseline characteristic may be used to determine a liquid level in the tank, e.g., a determination whether the liquid level is below or at/above the probe. In one embodiment, the baseline characteristic may be compared to a circuit characteristic that is measured as the tank is being filled. A difference between the baseline characteristic and the other circuit characteristic may be used to determine whether or not the probe is in contact with the liquid.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.