transducer of magnetic field and gauging rod

8/14/2019 transducer of magnetic field and gauging rod

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INSTRUMENTATIONDTC 3293

TRANDUCER OF MAGNETICFLOW METER

TRANDUCER OF GAUGINGROD


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CONTENTS

HISTORYINTRODUCTIONREQUIREMENT

PRINCIPLESTYPESAPPLICATIONADVANTAGESDISADVANTAGESCONCLUSIONREFERENCES


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HISTORY

MAGNETIC FLOW METERThese flow meters debuted in Holland in1952. Magnetic flow meters use wire coils

mounted outside of a pipe. A voltage runsthrough the coils, generating a magneticfield inside the pipe. As the conductiveliquid passes through the pipe, aseparate voltage emanates from thesystem. This voltage relates to the flowrate and is detectable.


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INTRODUCTION

MAGNECTIC FLOW METERThe most common flow meter apart from themechanical flow meters, is the

magnetic flow meter , commonly referred toas a "mag meter" or an "electromag".A magnetic field is applied to themetering tube, which results in a

potential difference proportional to theflow velocity perpendicular to the flux lines.
http://en.wikipedia.org/wiki/Magnetic_flow_meterhttp://en.wikipedia.org/wiki/Magnetic_fieldhttp://en.wikipedia.org/wiki/Fluxhttp://en.wikipedia.org/wiki/Fluxhttp://en.wikipedia.org/wiki/Magnetic_fieldhttp://en.wikipedia.org/wiki/Magnetic_flow_meter


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GAUGING ROD

Gauge rod is a graduated rod formeasuring the capacity of barrels,casks, etc.Gauging rod known as directmeasurement which is easy, simpleand is used for the purpose of localindication.
http://c/browse/Gauge%20rodhttp://c/browse/Gauge%20rod


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REQUIREMENT

MAGNETIC FLOW METER

The magnetic flow meter requires aconducting fluid,Example:o water, ando an electrical insulating pipe surface,a

rubber lined non magnetic steel tube.
http://en.wikipedia.org/wiki/Rubberhttp://en.wikipedia.org/wiki/Steelhttp://en.wikipedia.org/wiki/Steelhttp://en.wikipedia.org/wiki/Rubber


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GAUGING ROD

products quality,equipments and workerssafety and reduce losses .


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PRINCIPLES

MAGNETIC FLOW METERThe physical principle at work is Faraday's law of electromagnetic induction .

E is prop ortio nal t o V x B xD Where:E = the voltage generated in a conductor

V = the velocity of the conductorB = the magnetic field strengthD = the length of the conductor
http://en.wikipedia.org/wiki/Faraday%27s_law_of_inductionhttp://en.wikipedia.org/wiki/Electromagnetic_inductionhttp://en.wikipedia.org/wiki/Electromagnetic_inductionhttp://en.wikipedia.org/wiki/Faraday%27s_law_of_induction


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In -li ne m agn eti c fl ow met er o per ati ngpr inc ip le


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In ser ti on -ty pe fl ow me ter o pe rat ingpr inc ip le


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GAUGING RODRelative movement between the end anchorand the reference tube is measured witheither a dial depth gauge.Alternatively several rods may beinstalled radially in a single large hole

of each rod within its sleeve.


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TYPES

MAGNETIC FLOW METERWafer-style, where highest accuracy (upto +0.5% of reading) measurements arerequired.Insertion-style, for greater economy andparticularly for larger pipe sizes. AllOMEGA magnetic flow meters employ thestate-of-the-art dc pulsed magnetic field

system. The following discussion detailsthe principle of operation, as well asthe advantages, of dc pulsed typemagnetic flow meter.


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GAUGING RODRod head with cover and choice of rod


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Rod complete with anchor points(displayed on stand)


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APPLICATION

MAGNETIC FLOW METERThe magnetic flow meter can handle a wide variety ofapplications.

WaterA variety of industrial effluentsPaper pulpMining slurriesBrineSludgeLiquid food productsDetergentsSewageCorrosive acidsSolid bearing fluidsElectrolytesProcess chemicals


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Problem liquids also are includedsuch as:-o petroleum productso crude oilo deionized watero vegetable/animal fats.


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GAUGING ROD

The monitoring of rock and soil movementsincluding:-

Relaxation of rock around tunnels and otherunderground openingsFoundation settlementsMonitoring of subsidenceControl of natural and cut slopes, quarry and miningexcavations.

Displacements of retaining walls, bridgespiers and abutments


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ADVANTAGES

MAGNETIC FLOW METERObstruction less flow and virtually no pressuredrop.insensitivity to viscosity, specific gravity,

temperature and pressure (within certainlimitations).have good accuracy (0.5 to 1%) and no movingparts.can handle slurries and heavy particulates and

also lining protectors available.available in a wide variety of communicationprotocols.


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GAUGING RODStainless steelInfinite resolutionVery high accuracyPrecision linear bearings

MiniatureHigh cycle lifeReliable, accurate, simple to install and readFree from creep, kinking and other inaccuracies associated withtensioned wire systems.The simple single rod instrument is ideal for safety monitoring

during construction activities.Monitoring and control of construction by the New AustrianTunneling Method (NATM).Can be connected to Vibrating Wire displacement transducers forremote reading and data logging.


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DISADVANTAGES

MAGNETIC FLOW METERThe fluid needs to be conductive.This technology utilizes magnetic andelectric fields, the pipe must normallybe grounded.It is not recommended to use graphite

gaskets when installing a magnetic flowmeter


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CONCLUSION

Transducer of Magnetic flow metersuse wire coils mounted outside of apipe. A voltage runs through the

coils, generating a magnetic fieldinside the pipe.Transducer of Gauging Rod is the rodthat has been calibrated and it isput into a vessel. It is easy to usefor liquid or solid medium.


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REFERENCES

Swearingen, C., Choosing the Best Flow meter,Chemical Engineering, July 1999, McGraw-Hill,N.Y., p. 62Curtis D. Johnson, Process ControlInstrumentation Technology, 2006, PearsonEducation International Eighth Edition, p. 273-274Silverberg, P., High-Accuracy Flow meters Floodthe Market, Chemical Engineering, July 1998,McGraw-Hill, N.Y., p. 39Miller, R.W., "Flow Measurement EngineeringHandbook," 3rd ed., McGraw-Hill, N.Y., 1996Parr, E. A., "Industrial Control Handbook," 2nded., Butterworth-Heinemann, England, 1995

transducer of magnetic field and gauging rod

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