公开(公告)号：US20030051557A1

公开(公告)日：2003-03-20

申请号：US10246479

申请日：2002-09-19

Applicant: YOKOGAWA ELECTRIC CORPORATION

Inventor： Ikuhiko Ishikawa ,  Hironobu Oota

IPC: G01F001/58

CPC classification number: G01F1/60 ,  G01F1/588

Abstract: The present invention is intended to achieve measurement of electrode impedance that is not easily affected by fluid noise, and to accurately detect adhesion and discriminate the type of fluid. An electromagnetic flowmeter that is provided with a pipe through which the fluid to be measured is passed, applies a magnetic field to the above fluid driving the excitation coils using the excitation circuit, and thereby measures the flow rate of the fluid passing through the above-mentioned pipe; further comprising: a pair of detecting electrodes that detect the flow signal corresponding to the flow rate of the fluid passing through the above-described pipe, an earth electrode whose potential becomes the reference potential when the flow rate is measured, diagnosing signal generators that apply the diagnosing signals between the above detecting electrodes and the above earth electrode, and a diagnosis circuit to detect the resistance values between the above detecting electrodes and the above earth electrode as diagnostic signals.

Abstract translation: 本发明旨在实现不容易受流体噪声影响的电极阻抗的测量，并且准确地检测粘附和区分流体的类型。 一种电磁流量计，其具有通过所述被测量流体的管道，对使用所述励磁回路驱动所述励磁线圈的上述流体施加磁场，由此测量通过所述上述流体的流体的流量， 上述管道 进一步包括：一对检测电极，其检测与通过上述管道的流体的流量相对应的流量信号，当测量流量时其电位成为基准电位的接地电极，诊断应用的信号发生器 上述检测电极和上述接地电极之间的诊断信号，以及用于检测上述检测电极和上述接地电极之间的电阻值作为诊断信号的诊断电路。