13 - Pressure Sensors

7/24/2019 13 - Pressure Sensors

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Pressure SensorsPressure Sensors


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Pressure is a Value Derived from Force. Pressure Indicates the Action of Force

per nit Area.

!ence" Pressure #ransducers are often

$ased on Displacement Principle.


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Pressure Sensors can %e Divided Into& A%solute Pressure Sensors

'elative Pressure Sensors

Di(erential Pressure Sensors Dependin) on the *easurin) Principle

Involved


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A%solute Pressure Sensors *easure the

A%solute Pressure of the *edium. #he Point of 'eference is Vacuum +p ,

%ar


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'elative Pressure Sensors *easure the

Di(erential Pressure in 'elation toAm%ient Pressure.


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Di(erentialPressure Sensors

Do /ot Di(er from'elative PressureSensors as 'e)ardsto the Principle of*easurement.

#he0 *easure theDi(erentialPressure %eteen

#o losedS0stems and !ave


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3hen Pressure is Applied" the #u%e#ends to Strai)hten and Displacement'euslts.

#hese #u%es are oupled ith 4VD# to

*easure the Pressure in #erms of Volta)eSi)nal


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$ellos are Pressure 0linders ith a#hin orru)ated 3all.

#he $ello 6pands ith PressureProducin) a Displacement hich is

*easured in #erms of Volta)e and theAid of a 4VD#.


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4VD#

PressureFixed

block

Bellows

Motion


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A Diaphra)m is a Fle6i%le Plate hichcan %e *ade of 'u%%er" /eoprene" *etalor orru)ated *etal.

#he Diaphra)m De7ect ith Pressure

Producin) a Displacement hich is*easured in Volta)e and ith the Aid ofa 4VD#.


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4VD#

Pressure

Motion

Diaphragm


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Pressure Sitches are Pneumatic-lectric

Si)nal onverter hich ontain lectricalSitches that han)e State henPneumatic Pressure is Applied.

3hen Pressure is Applied to the Inlet

Port and it 'eaches the Preset Sitchin)Point" a Diaphra)m Actuates a *icro-Sitch thus #ri))erin) a onnectedlectrical ircuit.


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An lectronic Pressure Sitch is to %e sed for Pressure*onitorin) in a Pneumatic S0stem. #he Pressure Sitch isto %e Set at a Speci8ed Sitchin) Pressure.


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A Di(erential Pressure Sitch is to %e sed to *onitor theontamination 4evel of a Filter in a Pneumatic S0stem. #hePressure Sitch *ust %e Set to a Predetermined

Di(erential Pressure.


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ompressed Air 'eservoir is 4ea9 #ested %0 :ualit0 ontrol%0 *eans of a *echanical Pressure Sitch.

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13 - Pressure Sensors