Waters Xevo TQ MS, Operator And Maintenance Manual, Page: 152 / 184

C-6 External Connections
7. Connect the free ends of the two lengths of vacuum hose to the two,
1-inch OD, straight, vacuum ports on the mass spectrometer’s rear
panel.
8. Install 2 clamps on each hose end.
9. Connect the 12.7-mm clear PVC exhaust tubing to the roughing pump oil
exhaust filter port NW25 nozzle fittingusing an NW25 center ring, and then
secure the connection with an NW25 clamp, using the 7-mm nut driver to
install the clamp.
10. Secure the exhaust tubing with a hose clamp.
11. Route the open end of the exhaust tubing to a suitable exhaust vent.
12. Inspect the oil level in the pump.
See “Inspecting the Varian roughing pump oil level” on page 4-17 , and, if
needed, “Adding oil to the Varian roughing pump” on page 4-18 .
13. Make the electrical connections to the roughing pump.
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. Vent them to
atmosphere through separate exhaust lines. 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.
Caution:
To ensure correct operation of the roughing pump, do
not operate the pump with the oil level at less than 30% of the
MAX level.