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If the displayed leak rate does not decrease to zero after either SET button is
pressed, the spectrometer is not tuned and the TUNE function (see below)
must be initiated to retune the mass spectrometer.
To "Tune" the MS-40:
4.4
Grease Test Port Centering Ring:
A properly sealing test port O-ring is essential in assuring rapid pump down of
a test object. The O-ring should be inspected frequently, at least once each
week.
To access the O-ring, remove the KF clamp and centering ring atop the test
port. With a nonmetallic instrument or by hand, remove the O-ring carefully.
Be careful not to nick or damage the O-ring. Once removed, wipe it with a
lint free cloth and inspect it carefully for any damage. Specifically, look for
any cuts, wear or flat spots. Replace the O-ring if any damage is observed.
Whether installing a new or old O-ring, lubricate the O-ring with a thin film of
vacuum grease (Dow Corning vacuum grease is recommended). Re-install the
O-ring into the test port. Reattach the centering ring and clamp.
Check Air Filters:
The MS-40 has a filter that cleans the cooling air drawn into the unit. The
filter is located within the left side panel (as viewed from the front of the
unit).
The reusable wire mesh filter can be removed for cleaning by removing the
nuts that attach the filters to the outer panel. They may be cleaned with
Vacuum Instrument Corp.
compressed air (in the reverse direction of normal air intake) or can be washed
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1.
When the unit is in Standard Mode, press the TUNE momentary
switch (located on the left side of the User Panel).
2.
The MS-40 will sequence through a full "Auto Tune" cycle.
This includes optimizing all mass spectrometer voltages, finding
the optimum voltage, measuring background, adjusting both G3
(direct mode) gain and G2 (reverse mode) gain.
3.
When the unit is fully tuned and calibrated, the TUNE indicator
light will turn off and the READY LED will be lit.
Periodic Service
4-4
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