Micromeritics Gemini VII 2390a, Operator'S Manual, Page: 228 / 426

Troubleshooting Gemini VII
9-2 239-42828-01 - Dec 2012
Unable to reach a
satisfactory vacuum. Vacuum pump oil level is low or
needs to be changed. Inspect the oil to see if it is low
or needs changing. Refer to
Inspecting and Changing
Vacuum Pump Oil
, page
9-8
.
Vacuum pump is leaking. Locate and repair the source of
the leak or replace pump.
Centering ring has become too
flat and unable to hold a vacuum. Check the centering ring at the
pump intake port. Replace if
necessary. Refer to
Replacing
the Alumina in the Oil Vapor
Trap
, page
9-11
.
Check the centering ring at the
top of the oil vapor trap. Replace
if necessary. Refer to
Replacing
the Alumina in the Oil Vapor
Trap
, page
9-11
.
Nitrogen or helium drained
from tank, or depleted in a
short period of time. Leak(s) in the gas line
connection. Perform the Adsorptive (or
Helium) Line test to determine
the location of the leak. Refer to
Diagnostics
, page
6-17
for
details on these tests.
What Happened Why What To Do (continued)