Introduction to Magnetic flow meter, Working, Types & Applications

This flow meter is a transducer device that processes liquid flow by the voltage-induced crossways of the fluid by its movement through a magnetic field. A magnetic field is delivered to the gaging tube, which possessions in a potential difference proportionate to the flow velocity vertical to the flux outlines. The principle at its work is Faraday’s law of electromagnetic induction. Which states that the rate of change of flux is directly proportional to the induced voltage.

The magnetic flow meter needs a conducted fluid, for example, water that comprises ions, and an electrical protecting pipe superficial, for example, a rubber-lined steel tube. If the magnetic field course were persistent, electrochemical and other properties at the probes would make the potential difference hard to differentiate from the liquid flow persuaded potential difference. To alleviate this in present magnetic flowmeters, the magnetic field is continually upturned, stopping out the electrochemical potential difference, which does not alter the way with the magnetic field. This nevertheless stops the usage of permanent magnets for magnetic flowmeters. In this article, I will explain details about its employed, principle, equation etc. So let’s get started with the introduction to the Magnetic flow meter.

Introduction to Magnetic Flow Meter

• The magentic flow meter is called a mag flow meter or magmeter, is also used as a volumetric flow meter for measuring liquids with a conductivity of 5 µS/cm.
• It does not work for hydrocarbons, distilled water, or non-aqueous solutions.
• Its works are based on Farady’s law of electromagnetic induction for finding the velocity of the liquid.
• This meter has a nonmagnetic flow tube, electrodes, liner, and magent for producing the field.
• For magentic flow meters field is produced and passes through the liquid of the pipe.
• The application of Faraday’s Law is that signal voltage is based on liquid velocity magentic field strength and conductor length which is the distance between electrodes.
• Faraday’s Formula
  E direct proportional with V x B x D where:
  E =  voltage  in a conductor
  V = velocity of the conductor
  B =  magnetic field strength
  D = length of the conductor

The liquid in the pipe is a conductor and coils about the flow tube producing a magentic field. The signals are detected through 2 electrodes configured in the reverse side of the flow tube.

Flow signal at electrodes is directly related to velocity and magnetic field and distance between electrodes.

Magentic flow meters not needed for upstream and downstream moves so can connected in short lenght

Working of Magnetic flow Meter

• electromagnetic flow meter is a volumetric flow meter that works based on Faraday law which means voltage induces when conductors move in a magnetic field. But one restriction is magmeter can detect the flow rate of conductive fluid. 

 

 

Types of magnetic flow meter

In line Magnetic Flowmeter

• This type of flow meter measures the complete pipeline section velocity flow that comes with sensor mounting. It measures conductive liquid volume flow rate and affects density, pressure.
• It measures conducive liquid volume flow rate and has less affect on fluid density pressure etc. An in-line mag flow meter operated on Faraday’s Induction Law and used for measuring liquid with conductivity.

Insertion style flow meter

• Insertion style flow meter comes with close housing microprocessor of flow meter connected with probe that put in process pipe.
• Retractors with ball valve off to help flow meter probe to retracted from the pipe for routine maintenance.

Low Flow Magmeter

• magmeter is made for measuring flows of small parameters and for using portioning and metering operations. It does not have a moving part, MEGAMF7000 has features to handle particulate without clogging or jamming.

Precautions for Magnetic Flowmeters

• Use this meter for liquid or sludge conductive material. It can not produce a voltage signal
• The magentic flow meter is connected in a way that can easily be filled with liquid or affect flow measurements.
• The high temperature for a short time can affect the magnetic flow meter.
• The use of a meter in a vacuum ensures the liner does not collapse.
• The use of an electromagnetic flow meter close to conductivity can cause the flow meter to not work properly.

Uses of Magnetic Flowmeter

• Water/Wastewater Industry
• Brewing, Distilling, and Wine Making
• Metals and Mining
• Pharmaceutical
• HVAC
• Mining/Mineral Processing
• Chemical
• Food and Beverage
• Power Generation
• Pulp and Paper

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