ELASTIC PRESSURE TRANSDUCERS

PRESENTED TO:DR. Ing NAVEED RAMZAN PRESENTED BY:2007-chem-87

ESSENTIALS OF PRESSURE MEASUREMENT

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

Manometer methodElastic pressure transducersPressure measurement through

vacuumElectrical pressure transducer

ELASTIC PRESSURE TRANSDUCERS:

The flexible element detect the process pressure.

Show the corresponding movementMove the pointer in front of the dial.

TYPES OF ELASTIC PRESSURE TRANSDUCERS

Bourdon tube pressure gaugeDiaphragm pressure transducerBellows

BOURDON TUBE PRESSURE GAUGE

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

CLASSIFICATION OF BOURDON TUBE PRESSURE GAUGE

On the basis of shape On the basis of pressure measurement

ON THE BASIS OF SHAPE

C-shapedSpiral Helical

ON THE BASIS OF PRESSURE MEASUREMENT

Simplex Bourdon-tube pressure gauge

ON THE BASIS OF PRESSURE MEASUREMENTDuplex bourdon tube pressure gauge

DIAPHRAGM PRESSURE TRANSDUCER

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

Use the elastic property of the diaphragmOpposed by the spring

BELLOWS

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

Simple bellow element

CLASSIFICATION OF BELLOWS

Dual bellow indicator

References

http://www.vpmt.com/transducer.html [25-10-2010] http://www.omega.com/literature/transactions/volume3/pressure.

html [25-10-2010]

http://www.tpub.com/content/engine/14105/css/14105_130.htm [25-10-2010]

http://www.hydraulicspneumatics.com/200/TechZone/SystemInstrumen/Article/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-pressure

-gauges-work_.html [25-10-2010]

http://en.wikipedia.org/wiki/Metal_bellows [2-11-2010] http://kolmetz.com/pdf/EDG/ENGINEERING_DESIGN_GUIDELINE__i

nstrument_Rev%202.pdf [2-11-2010]

THANK YOU !!!