Let's take a look at Permeability testing of Foundry Sands
With Help of a Digital Permeability meter VPD by Versatile
This is a research grade precision instrument for Permeability measurement
Notice the Black cap on the right side of the Silvery Air and Water drums
Switch on the equipment and wait till it boots
Remove the Black cap and keep it aside
This Cap is generally used for calibration verification also. By selecting mm WC mode on machine and testing the result should show 100mm
Lift the water drum up to 0 Marking
Place the prepared specimen of 50mm height or 2"height (depending on standard being used) on the Rubber knob
Secure it properly and Press Start Button (in Green color)
The equipment should instantly start showing permeability.
At the end of a internal timer the reading latches and Blinks and the Air drum shall come down rapidly, indicating end of test.
For Specimen preparation refer to Specimen preparation video on this channel
Setting for the orifice as shown on the equipment screen can be changed for finer sands by pressing arrow buttons on the control unit
Now Lets check some Core Sand specimen of 50x50mm or 2". First make the desired specimen.
Put the Specimen in the Core permeability tube as shown
Press and release alternately to clamp the specimen inside the tube, when you feel good resistance to grip, stop pumping.
Remove the black cap from the equipment and lift the air drum to 0 marking
Affix the Core permeability tube with the specimen inside, firmly to the Rubber Boss
And Press the "Start" Button
Just like before, The equipment should instantly start showing permeability and At the end of a internal timer the reading latches and Blinks and the Air drum shall come down rapidly, indicating end of test.
