Search International and National Patent Collections

1. (WO2018108401) VIBRONIC SENSOR WITH TEMPERATURE COMPENSATION

Pub. No.:    WO/2018/108401    International Application No.:    PCT/EP2017/078847
Publication Date: Fri Jun 22 01:59:59 CEST 2018 International Filing Date: Sat Nov 11 00:59:59 CET 2017
IPC: G01F 23/296
Applicants: ENDRESS+HAUSER SE+CO. KG
Inventors: LOPATIN, Sergej
LANGE, Jörn
VOGT, Thomas
Title: VIBRONIC SENSOR WITH TEMPERATURE COMPENSATION
Abstract:
The invention relates to a method for determining and/or monitoring the density (p) and/or the viscosity (v) of a medium (3) in a container (2) by means of a vibronic sensor (1), and a corresponding sensor (1). A vibrateable unit (4) is excited to mechanically vibrate by means of an electrical excitation signal (UA), and the mechanical vibrations of the mechanically vibrateable unit (4) are received and converted into an electrical receive signal (UE). In addition, the excitation signal (UA) is generated from the receiver signal (UE) in such a way that at least one predeterminable phase shift (Δφ) occurs between the excitation signal (UA) and the receiver signal (UE), wherein a frequency (f) of the excitation signal (UA) is determined from the receiver signal (UE) with the occurrence of the predeterminable phase shift (Δφ). Furthermore, a damping (D) and/or a damping (D)-dependent variable is/are determined from the receiver signal (UE) with the occurrence of the predeterminable phase shift (Δφ), and the density (p) and/or the viscosity (v) of the medium is/are determined at least from the damping (D) and/or the damping (D)-dependent variable, and from the frequency (f) of the excitation signal (UA).