SUP-LDG Split-type Magnetic Flow Transmitter

Introduction

SUP-LDG split-type magnetic flow transmitter is applicable for all conductive liquids, such as water, acids, alkalis, slurries and many others. Typical applications are monitoring accurate measurements in liquid, metering and custody transfer. It can display both instantaneous and cumulative flow, and supports analog output, communication output and relay control functions.

The structure of electromagnetic flowmeter is mainly composed of magnetic circuit system, measuring tube, electrode, housing, lining and converter, etc.

The role of the magnetic circuit system is to generate a uniform DC or AC magnetic field. DC magnetic circuit with permanent magnets to achieve, its advantage is a relatively simple structure, less interference by the AC magnetic field, but it is easy to polarize the electrolyte liquid through the measurement conduit, so that the positive electrode is surrounded by negative ions, the negative electrode is surrounded by positive ions, that is, the polarization of the electrode phenomenon, and lead to an increase in internal resistance between the two electrodes, and thus seriously affect the normal operation of the meter. When the pipe diameter is larger, the permanent magnet is correspondingly large, bulky and uneconomical, so the electromagnetic flowmeter generally uses alternating magnetic field, and is generated by 50HZ industrial frequency power excitation.

Specification

Measuring principle

The magnetic flow transmitter works based on Faraday's law, and measure conductive medium with conductivity more than 5 μs/cm and flow range from 0.2 to 15 m/s. An Electromagnetic Flowmeter is a volumetric Flowmeter that measures the flow velocity of a liquid through a pipe. 

The measurement principle of magnetic flow meters can be described as follows: when the liquid goes through the pipe at the flow rate of v with a diameter D, within which a magnetic flux density of B is created by an exciting coil, the following electromotive E is generated in proportion to flow speed v:

E=K×B×V×D

Where:               E－Induced electromotive force                K－Meter constant                B－Magnetic induction density               V－Average flow speed in cross-section of measuring tube                D－Inner diameter of measuring tube

Application

These magnetic flow transmitters have been used throughout industries for more than 60 years. These meters are applicable for all conductive liquids, such as: Domestic water, industrial water, raw water, ground water, urban sewage, industrial wastewater, the processed neutral pulp, pulp slurry, etc.

Description