Waters Xevo G2 QTof, Operator'S, Overview And Maintenance Manual, Page: 215 / 248

Connecting the Varian oil-filled roughing pump B-5
2. Place the pump on the PTFE drip tray.
3. Using an NW25 center ring, attach the flanged end of the vacuum hose
to the roughing pump inlet flange, and then secure the connection with
an NW25 clamp, tightening it with the 7-mm nut driver.
4. Connect the free end of the vacuum hose to the vacuum port on the mass
spectrometer’s rear panel.
5. Using an NW25 center ring, attach the 12.7-mm clear PVC exhaust
tubing to the roughing pump oil exhaust filter port NW25 nozzle fitting,
and then secure the connection with an NW25 clamp, tightening it with
the 7-mm nut driver.
6. Secure the exhaust tubing with a hose clamp.
7. Route the open end of the exhaust tubing to a suitable exhaust vent. For
further information, see the Waters Xevo G2 QTof MS Site Preparation
Guide (part number 715001948).
8. Inspect the oil level in the pump (see “Inspecting the Varian roughing
pump oil level” on page 5-20 , and, if necessary, “Adding oil to the Varian
roughing pump” on page 5-21 ).
9. Make the electrical connections to the roughing pump (see page B-6 ).
Caution:
To avoid gas leaks, use the sharp knife to cut the PVC
exhaust tubing squarely (that is, perpendicular to its horizontal
axis).
Caution:
The instrument requires two separate exhaust systems:
one for nitrogen, the other for the roughing pump. Oil mist can
seriously damage the instrument if the nitrogen exhaust line
connects with the roughing pump exhaust line. Your warranty
does not cover damage caused by routing exhaust lines incorrectly.
See also “Connecting the nitrogen exhaust line” on page B-12 .
Caution:
To ensure correct operation of the roughing pump, do not
operate the pump with the oil level outside the range shown by the
oil level sight glass minimum and maximum oil level indicators.