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To Calibrate a Pressure Gauge Using a Dead Weight Pressure Gauge Calibrator

 
 

Apparatus

  • Dead weight pressure gauge calibrator having the following main components,
  • Cylinder
  • Weights
  • Leveling screws
  • Spirit level
  • Cylinder inlet
  • A gauge to be calibrated
  • Hydraulic bench

Concepts:

Calibration of guage:

To compare the values of an instrument with that of the standard ones is known as calibration of that instrument.

Pressure gauges:

The instruments with the help of which we measure the pressure are called as the pressure gauges.

Also ReadAlso Read: Calibration of Rectangular Notch | Other Fluid Mechanics Experiments

Absolute Pressure:

The pressure measured with reference to absolute zero is called as absolute pressure.Pressure Guage

Gauge pressure:

The pressure measured with the atmospheric pressure is called as gauge pressure.

Vacuum pressure:

Negative gauge pressure is known as vacuum pressure.

Atmospheric pressure:

The pressure exerted by the atmosphere above us is known as the atmospheric pressure. Its standard values are given below.

1 atm = 14.7 psi
101300 Pa
0.1 Mpa
76 cm of Hg
760 mm of Hg
1.01 bar
34’ of water

Procedure:

  • I placed the pressure gauge and calibrate assembly on bench top.

  • I connected the inlet tube to the gauge manifold.

  • A length of tube was connected to the calibrator drain and laid into the channel to prevent spillage of water on the bench top.

  • The calibrator was leveled by the adjusting feel whilst observing the spirit level.

  • I removed the piston and accurately determined its mass.

  • I closed the control valve of the bench and open both cocks then I operated the pump starter and also open the control valve and admitted the water to the cylinder.

  • After removal of air bubbles from the tube, I closed the cock along with flow control valve and switched of the pump.

  • I noted the gauge readings corresponding to the piston mass of .5 kg.

  • Then I added .5 kg mass each time and noted the corresponding gauge readings.

  • Then I find out the Absolute gauge error by the following formula.

  • Absolute gauge error = Pressure in cylinder – Gauge reading

  • Then I find out the %age gauge error by the following formula.

  • %Age gauge error = Absolute gauge error *100 / Pressure in cylinder

  • Then I plotted a graph between %age gauge error and pressure in cylinder.

S.No

Piston mass
Kg

Piston area
m2

Pressure in cylinder
KN/m2
=F/A

Gauge readings
KN/m2

Absolute gauge error
KN/m2

%Age gauge error

1

0.5

244.8*10-6

2042.48

10

2032.48

99.51

2

1

244.8*10-6

4084.96

30

4054.96

99.26

3

1.5

244.8*10-6

6127.45

50

6077.45

99.18

4

2

244.8*10-6

8169.93

69

8100.93

99.15

5

2.5

244.8*10-6

10212.41

89

10123.41

99.12

Graph of Pressure in Cylinder VS %age Gauge Error

 

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