FLUID MECHANICS , EXPERIMENT # 2

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

PURPOSE:

The objective of this experiment is to assess the accuracy of pressure gauge.

APPARATUS:

Dead weight pressure gauge calibrator having the following main components,

• Cylinder

• Weights

• Leveling screws

• Spirit level

• Cylinder inlet

• A gauge to be calibrated

PROCEDURE:

1. Place pressure gauge calibration on the table.
2. Find the mass and diameter of the piston.
3. Fill half of the cylinder with lubricating oil.
4. Place piston in the cylinder and rotate the piston to minimize the effect of friction and take reading of gauge.
5. Add more weights and note the reading.

THEORY:

As we know that, pressure is equal to force per unit area.

Pressure = P = F/A = W/A = mg/A                 (  F = W = mg )

Absolute Pressure:

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

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

OBSERVATION & CALCULATION:

Cross sectional area of the piston = (π * D²⁾/4

S/No	Mass (kg)	Theoritical pressure P =mg/A (N/cm2)	Guage reading Kg/cm2	Guage reaeding *9.81 (N/cm2)	Guage error= (Theoretical pressure – guage pressure)
1
2
3
4
5

Mean gauge Pressure = _______________

%age gauge error = (Absolute gauge error / Gauge Pressure) *100

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Posted in: Fluid Mechanics l