Crystal GaugeCalXP - Manual (Page 8)

Operation  6
GaugeCalXP Operation Manual
Remove Air from the System or Generate Vacuum
!
WARNING: Do not use this procedure if the test device can be damaged by vacuum.
1 With the Crystal reference gauge in place, remove the device to be tested.
2 Install a short piece of hose going from the device test port to the top of the reservoir.
This is to return the fl uid expelled to the reservoir. If you do not have a short piece of hose please use paper towels or a shop rag to soak up the excess fl uid.
3 Rotate the screw handle fully clockwise.
Make sure the reservoir does not run out of fl uid while you do this.
4 Connect the device to be tested.
5 Fill the reservoir with fl uid, almost to the top.
6 Rotate the screw handle fully counter-clockwise.
Observe the reference gauge–it should start indicating negative pressure as you rotate the screw handle. The GaugeCalXP can typically generate -12.5 PSI
vacuum at sea level for a device with a small volume.
7 As you reach the end of travel, and the comparator's piston reaches the fi ll point (about 1 cm from the end of travel), you will see the fl uid level drop in the
reservoir. Unless you are fi lling a very large device, the volume of fl uid in the reservoir should be suffi cient to completely fi ll the system. If not, repeat this
procedure, but be ready to fi ll the reservoir as it drops.
8 Before generating positive pressure with the comparator, refi ll the reservoir.
Note: If this procedure does not solve the problem, the volume is too large and an auxiliary hydraulic pump is required.