Method of measuring level in a vessel

US6634228B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Rolf Deserno · Maulburg, DE
• Dietmar Spanke · Steinen, DE

Key dates

• Filing date: Jan 28, 2002
• Grant date: Oct 21, 2003
• Expiry date: Jan 28, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F23/284
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method of measuring level in a vessel by means of a level measuring device operating with pulses is disclosed. Based on waves being transmitted into the vessel and reflected from the contents of the vessel a digital sampling sequence, representative of the amplitudes of the waves, is generated and a transit time difference, representative of the measuring level, is determined. For determining the difference, a first data tuple, representative of a reference point in the envelope signal and a second data tuple, representative of an echo pulse in the envelope signal, are derived from the sampling sequence, each of the data tuple having an amplitude value and a time value. To obtain the transit time value of the second data tuple an extreme value representative of a highest amplitude value of the echo pulse is derived from the digital sampling sequence, wherein the extreme value being estimated by means of a first, a second and a third data record selected from sampling sequence in range of the echo pulse and wherein the second data tuple being determined by means of the extreme value, respectively.