Troubleshooting; Shortening The Capillary; Omnistar - Pfeiffer Vacuum OmniStar GSD 300 O1 Operating Manual

8 Troubleshooting

If the gas flow of the units is restricted or completely blocked,
check for the following causes:
2
•
→
Capillary clogged 27 and
2
•
→
Orifice clogged 34
If the fault is more severe, please contact the nearest
Pfeiffer Vacuum Service Center.

8.1 Shortening the Capillary

If the capillary tends to clog, it may be advisable to shorten it.

8.1.1 OmniStar™

Preconditions
•
Unit switched off
•
Capillary detached from measurement point
•
Length of capillary still adequate after it has been shortened
Required tools
• Tube cutter (recommended →
or knife file
Bend the capillary
until it breaks
BG 805 071 BE (9904) GSD300.om
2
29
2
36)
Make two opposing
small indentations
Max. depth of
indentations 0.5 mm
Do not finish the
point of break
(capillary gets
clogged)
Turn on the unit and wait 10 min (turbo pump acceleration
time)
Check the pressure in the analysis chamber as follows:
•
Start Balzers Quadstar™ 422 <Service>
•
In the <Measure> menu choose <Total pressure>
•
The total pressure of the analysis chamber is displayed
Displayed pressure >4×10
Displayed pressure <4×10
Possible causes:
•
Capillary clogged at the end
⇒ Shorten the capillary by additional 10 mm
•
clogged
Orifice
⇒ Replace orifice (→
•
Capillary clogged across the entire length
⇒ Replace capillary (→
Connect the capillary to the measurement point
-6
mbar
-6
mbar
2
34)
2
29)
Troubleshooting 27