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LAB # 2Calibration of
Pressure GaugeFLUID MECHANICS LABINSTRUCTOR: HUSNAIN AHMED
9TH SEPTEMBER, 2014
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Content
BourdonGauge
DeadWeight
Calibrator
ExperimInstructio
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INTRODUCTION
Bourdon tube gauge is device to measure andrepresent applied pressure.
SENSING ELEMENT:
Consists of a twisted or curved metal tube.
The tube is constructed from a thin walled tube ofnon circular cross section
REPRESENTATIVE ELEMENT:
A needle on a Gauge.
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PARTS:
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WORKING PRINCIPLE
The bourdon principle believes that aflattened tube will reform or growconsiderably in the cross sectionalaspect when a pressure is applied. Thischange can be represented by a needleon a gauge.
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PROS & CONS
PROS:o Less Expansiveo Portableo Easy to useo No leveling required
CONS:o Static Measurement onlyo Lower accuracy.
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INTRODUCTION
A dead weight tester apparatus uses knowntraceable weights to apply pressure to a fluid forchecking the accuracy of readings from a pressuregauge.
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PARTSPiston
The Dead Weight Calibrator accessory comprises a precision
ground piston and cylinder.
WeightsWeights may be added to the piston so that a number ofpredetermined pressures may be set up within the cylinder.
BaseboardThe cylinder is mounted on a baseboard which is supported on
leveling screws and fitted with a spirit level.
Gauge ConnectionThe gauge under test is linked to the cylinder connection by aflexible tube.
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WORKING A pressure gauge could be calibrated by mounting a closed vessel
with a piston at one end. (Such a vessel is called a dead-weighttester).
Placing a weight on the piston produces a known pressure in the vessel equal to the weight divided by the piston area.
After applying a series of weights and measuring the correspondingoutput value of the pressure gauge you can plot the relationshipbetween the gauge reading and added weights.
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CALIBRATION OFPRESSURE GAUGE
EXPERIMENT 2
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OBJECTIVE
To calibrate a Bourdon type pressure gauge andto determine the gauge errors.
To determine the measurement errors in thereference pressure source used for calibration
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APPARATUS
Accurate weights
Bourdon Tube PressureGauge
Dead Weight Tester
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APPARATUS DEMONSTRATION
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Related Theory A measurable reference pressure, P is generated due to the use of piston and weights with the cylinder:
P=F/A (Pascals)F=Mg
A= d2/4 F is the force applied to the liquid in calibrator cylinder M is the total mass including piston mass A is area of piston
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EQUIPMENT SETUP
Note the weight of the piston (0.5kg) and individual calibration masses before setting the equipment.
Place the dead weight calibrator bench top and ensure that the base ishorizontal by adjusting the base using spirit level. This is necessary toensure the vertical transfer of the applied load and free rotation of
piston.
Attach the flexible tube from the base of the cylinder to the base of theBourdon gauge.
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PROCEDURE
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PROCEDUREObserve the Pressure gauge unit setup.Be sure all hoses are attached securelyto the Bourdon gauge.
Record the gauge reading ( KN/m2) forthe unloaded piston, which correspondsto a total mass.
Place the given dead weight (0.5 Kg)one by one and record the reading ofthe gauge.
To prevent the piston from sticking,rotate the piston gently as each mass isadded, so that the friction in the pistoncan be reduced.
Tabulate data in table & Plot thecalibration curve 21
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TO DO !
ASSIGNMENT SUBMISSION (FLUID MECHANICS APPLICATION)
TASK 1: LAYOUT SUBMISSION
PERFORM EXPERIMENT
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