03-914978-00:1
87
Mass Spectrometer Maintenance
•
If not, the fan is broken and should be replaced. Contact your Varian
Customer Support Representative to arrange for a replacement.
9. Zone 3: Diffusion pump compartment. The Zone 3 fan is located in the lower left
corner of the rear panel. Failure of this fan will cause the diffusion pump to
overheat. This will be detected by the diffusion pump controller, which will initiate
a system shutdown. The only components of zone three requiring checking are
the air intake and exhaust. To check:
a. Check the left side cover is in place and not obstructed.
b. Check the rear of the instrument has at least 250 mm (10") of clearance.
c. Check the GC and MS are separated by approximately 19 mm (3/4")
using the standoffs installed on the MS.
Checking the Diffusion Pump Fluid Level and Condition
Optimum performance of the diffusion pump depends on the pump’s fluid level
and condition, which should be checked monthly. The fluid can only be checked
by removing the left side cover.
NOTE: If the cover is off for more than five minutes the pump will overheat and
the diffusion pump controller will initiate a system shutdown.
However, if performed quickly this procedure can be done with the pump running.
To check the fluid:
1. Carefully separate the MS from the GC by approximately 250 mm (10").
NOTE: Be careful not to break the GC column.
2. Remove the four screws holding the left side cover in place, and quickly remove
the cover.
3. Check the fluid in the diffusion pump’s sight glass.
•
The fluid level should be within the “FULL HOT” zone.
•
If the level is at or below the lower limit of the zone the pump fluid
should be topped off.
•
The fluid should be clear.
•
If the fluid is dark in color and opaque, the pump should be cleaned.
4. Refit the left side cover and fasten in place with the four screws and two spacers.
•
If the fluid is to be topped off or changed, the cover must still be refitted
during shutdown.
5. Carefully slide the MS to the GC.
