Patent · US Expired

Method of monitoring the level of a liquid in a container

US5798698A · kind A · utility

5Cited by

3References

3Claims

0Family size

Assignee

GESTRA AG · DE

Inventors

Joachim-Christian Politt · Bremen, DE
Holger Schroter · Osterwieck, DE
Kerstin Borchers · Bremen, DE

Key dates

Filing date	Feb 20, 1996
Grant date	Aug 25, 1998
Priority date	—
Expiry date	Feb 20, 2016

Classification

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

Abstract

In cases of application where the critical temperature occurs or could occur, safe monitoring of the level of the liquid was not possible heretofore because the physical properties of the liquid and of the gaseous medium present above the latter in the container no longer differ at this temperature. The method includes the temperature in the container in the monitoring of the level of the liquid. Below a lower comparative temperature value (Tu), the output signal of the evaluator unit is determined by the measuring signal of the level sensor. The measuring signal of the level sensor is disregarded above this value (Tu). The evaluator unit supplies an output signal that is on the safe side with respect to the level of the liquid. The comparative temperature (Tu) is below the critical temperature to an extent such that the inaccuracies in the measurement of the level sensor and the temperature sensor have no interfering effect.

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