Elastic Pressure Transducers by 87

ELASTIC PRESSURE TRANSDUCERS

PRESENTE D TO: PRESENTED TO: DR. Ing NA NAVEED VEED RAMZAN RAMZAN PRESENTED BY: 2007-chem-87

ESSENTIALS OF PRESSURE MEASUREMENT y

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Pressure measuring devices usually used for the measurement of the pressure exerted by a fluid. The application of the force for the pressure calculations must be perpendicular to the surface. Pressure is strongly influenced by position within a static fluid but, at a given position, it is independent of direction. Pressure is unaffected by the shape of the confining boundaries.

PRESSURE MEASUREMENT METHODS y

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Manometer method Elastic pressure transducers Pressure measurement through vacuum Electrical pressure transducer

ELASTIC PRESSURE TRANSDUCERS:

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The flexible element detect the process pressure.

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Show the corresponding movement

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Move the pointer in front of the dial.

TYPES OF ELASTIC PRESSURE TRANSDUCERS

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Bourdon tube pressure gauge

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Diaphragm pressure transducer

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Bellows

BOURDON TUBE PRESSURE GAUGE y

It can measure the pressure of steam and air up to 100,000 psig.

CLASSIFICATION OF BOURDON TUBE PRESSURE GAUGE

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On the basis of shape

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On the basis of pressure measurement

ON THE BASIS OF SHAPE y

C-shaped

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Spiral

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Helical

ON THE BASIS OF PRESSURE MEASUREMENT y

Simplex Bourdon-tube pressure gauge

ON THE BASIS OF PRESSURE MEASUREMENT y

Duplex bourdon tube pressure gauge

DIAPHRAGM PRESSURE TRANSDUCER y

A diaphragm is typically constructed of two flexible disks, and when a pressure is applied to one face of the diaphragm, the position of the disk face changes due to deformation. The position can be related to pressure.

CLASSIFICATION OF DIAPHRAGMS y

Use the elastic property of the diaphragm

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Opposed by the spring

BELLOWS y

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Bellows are the elastic element and is convoluted unit. The bellows elastic element contract and expand axially by the pressure change. Applied pressure may be on the inside or the outside of  the bellows.

CLASSIFICATION OF BELLOWS y

Simple bellow element

CLASSIFICATION OF BELLOWS y

Dual bellow indicator

References y y

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http://www.vpmt.com/transducer.html [25-10-2010] http://www.omega.com/literature/transactions/volume3/pressure.html [2510-2010] http://www.tpub.com/content/engine/14105/css/14105_130.htm [25-10-2010] http://www.hydraulicspneumatics.com/200/TechZone/SystemInstrumen/Art icle/True/6438/TechZone-SystemInstrumen [25-10-2010] http://www.tpub.com/content/engine/14105/css/14105_131.htm [25-10-2010] http://www.frca.co.uk/article.aspx?articleid=100325 [25-10-2010] http://www.tpub.com/content/fc/14104/css/14104_233.htm [25-10-2010] http://www.ehow.com/how-does_5240680_do-diaphragm-pressuregauges-work_.html [25-10-2010] http://en.wikipedia.org/wiki/Metal_bellows [2-11-2010] http://kolmetz.com/pdf/EDG/ENGINEERING_DESIGN_GUIDELINE__inst rument_Rev%202.pdf [2-11-2010]