Multi-electrode electromagnetic flowmeter

Abstract

The invention discloses a multi-electrode electromagnetic flow meter and relates to the technology field of measurement. The flow meter comprises six electrodes arranged on the circular cross-section of a sensor conduit, the sensor conduit is perpendicular to the central axis of the conduit, wherein, four electrodes are measuring electrodes that are symmetrical about the X-axis and the Y-axis of the circular cross-section, and two electrodes are liquid collecting electrodes. Two measuring electrodes are in a group, the two liquid collecting electrodes are arranged between the two groups of measuring electrodes. The two measuring electrodes in a group are reliably connected. The two groups of measuring electrodes are respectively connected with a converter and an amplifier. The two liquid collecting electrodes are reliably connected and then connected to the metal of a measuring conduit, and serve as the basis ground of flow signals for connecting the ground terminal of the converter and the amplifier. The multi-electrode electromagnetic flow meter is characterized by small additive measuring error, convenient assembly and reliable liquid collecting reference, and can provide the reliable ground reference electrical potential.

Description

technical field [0001] The invention relates to measurement technology, in particular to an electromagnetic flowmeter technology in industrial automation instruments. Background technique [0002] The electromagnetic flowmeter is composed of an electromagnetic flow sensor (hereinafter referred to as the sensor) and an electromagnetic flow converter (hereinafter referred to as the converter). Converter to sensor (sensor structure such as figure 1 The excitation coil (shown) provides an excitation current to generate a working magnetic field in the area of ​​the catheter where the detection signal electrode is installed. The conductive liquid flows through the magnetic field to cut the magnetic field lines, and the electromotive force proportional to the liquid flow rate can be induced on the detection electrode. The converter amplifies and converts the induced electromotive force into current, frequency or digital communication signals that can be received by other receivin...

AI Technical Summary

Problems solved by technology

However, the material of the upstream and downstream metal pipes is different from that of the measuring electrodes, or the pipes are corroded, which will cause variable DC polarization interference voltage or unreliable contact

At the same time, the grounding ring needs to be made of the same material as the measuring electrode, which will increase the manufacturing cost of the flowmeter

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