Patent · US Expired

Method for checking the proper functioning of a level indicator

US7730760B2 · kind B2 · utility

3Cited by

8References

7Claims

0Family size

Assignee

ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

Herbert Schroth · Schopfheim, DE
Andreas Mayr · Meitingen, DE
Manfred Hammer · Wehr, DE

Key dates

Filing date	Dec 16, 2005
Grant date	Jun 8, 2010
Priority date	—
Expiry date	Dec 16, 2025

Classification

Technology area (CPC G)Physics
CPC primaryG01F25/20
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method for checking proper functioning of a fill-level measuring device working according to the travel time principle. For this purpose, in predetermined or selectable time intervals (ta), a current measured value curve at a current fill level (hactual) is ascertained; on the basis of the current measured value curve, a current wanted echo signal is determined. Subsequently, on the basis of the current wanted echo signal, an expected value (E) for quality of a wanted echo signal at least one predetermined fill level (hdesired) is ascertained. The ascertained expected value (E) for quality of the wanted echo signal at the predetermined fill level (hdesired) is compared with a predetermined critical value for quality, and an error condition is diagnosed, when the ascertained expected value falls below the critical value for quality.

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