Crystal GaugeCalXP Manuel d'utilisateur télécharger pdf (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.

his 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.

ake 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.

Obser

ve 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.

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Crystal GaugeCalXP Manuel d'utilisateur Page 8

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