公开(公告)号：US20240053178A1

公开(公告)日：2024-02-15

申请号：US18258029

申请日：2021-11-26

Applicant: Endress+Hauser Flowtec AG

Inventor： Timo Schirmeier ,  Werner Tanner ,  Dieter Schweizer

IPC: G01F1/32 ,  G01F1/325

CPC classification number: G01F1/3218 ,  G01F1/3287

Abstract: A vortex flow meter comprises a measuring tube; a bluff body arranged in the measuring tube; a sensor device, having a paddle, a sensor main body and a piezo element, and an electronic operating circuit. The electronic operating circuit has a measuring circuit comprising an operational amplifier and a capacitor. The first capacitor forms a feedback between the output and the measurement input, wherein the reference input can be supplied with a first reference voltage. The measurement circuit has a first switch, wherein the electronic operating circuit is designed to connect the piezo element via the first switch to the measurement input of the operational amplifier and to charge it with a first charging voltage by means of a second switch position. The electronic operating circuit derives an information relating to a state of the piezo element from a discharge process of the piezo element.