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Elastic Pressure Transducer. WASEEM ZIA (2007-CHEM-15). Synopsis:. Types Pressure Sensors Summary Functional Uses Merits & Demerits References. Types:. Bellows Bourdon tube Diaphragm. Bellows.

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elastic pressure transducer

Elastic Pressure Transducer

WASEEM ZIA (2007-CHEM-15)

synopsis
Synopsis:
  • Types
  • Pressure Sensors Summary
  • Functional Uses
  • Merits & Demerits
  • References
types
Types:
  • Bellows
  • Bourdon tube
  • Diaphragm
bellows
Bellows

The bellows is a one-piece, collapsible, seamless metallic unit that has deep folds formed from very thin-walled tubing.

bourdon tube
Bourdon tube

The bourdon tube pressure instrument is one of the oldest pressure sensing instruments in use today. The bourdon tube (refer to Figure 3) consists of a thin-walled tube that is flattened diametrically on contrary sides to produce a cross-sectional area elliptical in form, having two long flat sides and two short round sides.

diaphragm
Diaphragm

Diaphragm elements are made of circular metal discs or flexible elements such as rubber, plastic or leather.

pressure sensors summary
Pressure Sensors Summary

In a bellows-type sensor:

  • System pressure is applied to the internal volume of a bellows and mechanical linkage assembly.
  • As pressure changes, the bellows and linkage assembly move to cause an electrical signal to be produced or to cause a gauge pointer to move.
contd
Contd…

In a bourdon tube-type sensor:

  • System pressure is applied to the inside of a slightly flattened arc formd tube. As pressure increases, the tube tends to restore to its original round cross-section. This change in cross-section causes the tube to straighten.
  • Since the tube is permanently fastened at one end, the tip of the tube traces a curve that is the result of the change in angular position with respect to the center. The tip movement can then be used to position a pointer or to develop an electrical signal.
contd1
Contd….

In Diaphragm pressure sensor:

  • They are used to measure gauge pressures over very low ranges.
  • They may be made up of Metallic diaphragms gauge (brass or bronze) Slack diaphragms gauge (Rubber).
functional uses
Functional Uses:
  • Pressure sensors perform the following basic functions:
    • Indication
    • Alarm
    • Control
  • If a pressure sensor becomes inoperative:
    • A spare sensor element may be used (if installed).
    • A local mechanical pressure gauge can be used (if available).
    • A precision pressure gauge may be installed in the system.
contd2
Contd….
  • Environmental concerns:
    • Atmospheric pressure
    • Ambient temperature
    • Humidity
merits demerits
Merits & Demerits

Merits of Flexible Pressure transducer

  • Flexible Pressure transducer cost is low.
  • Flexible Pressure transducer has easy structure
  • Flexible Pressure transducers have been time tested in application.
  • Flexible Pressure transducer allows high accuracy, spatially in relation to cost.
contd3
Contd….

Demerits of Flexible Pressure transducer

  • Flexible Pressure transducer has a low spring pitch.
  • Flexible Pressure transducer is inclined to shock and throb.
  • Flexible Pressure transducer is inclined to hysteresis.
references
References
  • http://controls.engin.umich.edu/wiki/index.php/PressureSensors retrieved at 11/10/2010
  • Kirk, Franklin W. and Rimboi, Nicholas R., Instrumentation, Third Edition, American Technical Publishers, ISBN 0-8269-3422-6.
    • Wightman, E.J., Instrumentation in Process Control, CRC Press, Cleveland, Ohio.
    • Rhodes, T.J. and Carroll, G.C., Industrial Instruments for Measurement and Control, Second Edition, McGraw-Hill Book Company.
    • Process Measurement Fundamentals, Volume I, General Physics Corporation, ISBN 0-87683-001-7, 1981
  • http://vpmt.com/transducer.htm retrieved at 11/10/2010