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INSTRUCTION MANUAL
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BOURDONS TUBE PRESSURE GAUGE
Aim :- Measurement of pressure by using Bourdon's tube pressure
gauge.
Prior Concept:Definition of pressure, units of pressure, Types
of pressure, generalizedmeasurement system.
New Concepts:
Pressure measuring devices are of three types.A. Gravitational
(eg. Manometers, Piezometer etc.),B. Direct acting type (eg.
Diaphragm pressure gauge, bellows pressuregauge)C. Indirect acting
electrical type (eg. Strain gauge)
Pressure MeasuringDevices
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Gravitational Direct Acting Type usingIndirect acting
TypeEg.Manometer diaphragm belowEg.Strain Gauge
Learning Objectives:
1 Able to know different pressure measuring instruments.2 Able
to know working principle.3 Able to analyze working principle from
the point of view of generalizedmeasurement system.4 Able to know
differences between pressure measuring instruments.5 Able to select
appropriate pressure measuring instrument forappropriate
application.6Ability to observe and measure the pressure of various
systems by above
instruments.
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Apparatus:
i) Bourdon's Pressure Gauge. Capacity - 1 to 10 bar, least count
- 0.5 bar(kg/cm2)ii) System of which pressure has to be
measured
iii) Air cylinder
Exploded view of Bourdon's Pressure Gauge
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Theory:-
Bourdon's tube is normally oval in cross section. It is coiled
intocircular arc (generally included angle is less than 360). As
pressure isapplied to tube, oval section tends to round out,
becoming more circularin cross section. Inner and outer lengths
will be approximately equal tooriginal lengths; hence only recourse
for the tube is uncoil. Movement offree end of tube is magnified
through linkages and gearing. Bourdon'spressure gauge operates on
the principle that deflection or deformationdue to elastic force is
used as measure of pressure.
Procedure:
1) Locate the position in the system of which pressure has to
bemeasured.2) Connect Bourdon's pressure Gauge with air
regulator.3) Keep air regulator knob fully anticlockwise so as to
have zero pressurein the Bourdon's tube.4) Develop the pressure in
air cylinder / vessel.5) By slowly turning the knob of air
regulator clockwise, increase thepressure applied to
Bourdon's tube in proper steps.
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6) Note the angular position of the pointer attached to the
mechanicalamplifier system
Driven by free end of Bourdon's tube for different pressure
input to thetube.7) Note down the reading on pressure gauge also by
turning the knob of
air regulator each time.
Observation Table:-
ReadingNo.
Input AirPressure( kg/m2 )
AngularDeflection ofPointer(Degree)
1)2)3)4)5)
