The experiment should be done in two parts.
i) Loading, ii) Unloading
To calibrate the dead weight gauge, the barrel of the calibrator is filled with oil and the
piston's weight as well as the area of its cross section are measured. Hence they are
constant and known quantities.
The Pressure Gauge can measure 0-1000 KPa pressure.
Loading
-
At first drag 0.5 kg mass from the Mass Block and drop it to blue box on piston. The mass
chosen, will be shown in 'Mass (kg)' input box. The piston will move downwards in the
chamber due to pressure.
- Click on the wheel to rotate it clockwise and to apply pressure in the filled oil inside.
The Pressure Gauge will show the applied pressure through wheel. When the pressure applied
through
the wheel will be equal to the pressure caused by the chosen mass, the wheel will stop
rotating and piston will move to its previous position (i.e upwards).
- Click on 'Table' at the bottom of the page to see the observation table and click on 'Add to
Table' button to fill the observation table.
- Similarly, drag 1-10 kg masses from the Mass Block one by one and drop it to blue box on
piston. The total mass chosen, will be shown in 'Mass (kg)' input box. The piston will move
downwards in the chamber due to pressure.
Repeat steps 2-3 each time after a mass is chosen. After taking three to four successive
observations click on 'Plot' button. The 'Percentage Error (&prcent;) vs. Gauge Reading
(KPa)' plot will be shown.
Hover the cursor on the plot, one camera icon will be visible in the top right corner above
the plot section. Click on that camera icon to download the plot.
- Click on 'Clear' button to erase the observation data and plot. Click on 'Table' button to
hide the observation table.
Unloading
-
After loading part is completed, drag the uppermost mass from the blue box on piston and
drop it to Mass Block . The total mass left, will be shown in 'Mass (kg)' input box. The
piston will move upwards from the chamber due to decrease in pressure.
- Click on the wheel to rotate it anti-clockwise and to decrease pressure in the filled oil
inside. The Pressure Gauge will show the applied pressure through wheel. When the pressure
applied through
the wheel will be equal to the pressure caused by the masses, left in the blue box, the
wheel will stop rotating and piston will tend to move to its previous position (i.e
upwards).
- Click on 'Table' at the bottom of the page to see the observation table and click on 'Add to
Table' button to fill the observation table.
- Similarly, drag other masses from blue box to the Mass Block one by one. The total mass
chosen, will be shown in 'Mass (kg)' input box. The piston will move upwards from the
chamber due to decrease in pressure again.
Repeat steps 2-3 each time after a mass is kept back to the Mass Block. After taking three
to four successive observations for unloading, click on 'Plot' button. The 'Percentage Error
(&prcent;) vs. Gauge Reading (KPa)' plot will be shown.
Hover the cursor on the plot, one camera icon will be visible in the top right corner above
the plot section. Click on that camera icon to download the plot.
- Click on 'Clear' button to erase the observation data and plot. Click on 'Table' button to
hide the observation table.
