LTQ Orbitrap XL Hardware Manual

Functional Description
Vacuum System
Vacuum System Controls
Vacuum Gauges
Warning When analyzing hazardous materials, these may be present in
the effluent of the forepumps! The connection to an adequate exhaust
system is mandatory! ▲
Leave the on/off switches of the forepumps always in the On position to
provide the control from the vacuum control panel. Before starting the
pumps, however, make sure that:
• The forevacuum pumps are filled with oil,
• They are connected to the power supply, and
• The gas ballast is shut.
For a detailed description of the forepumps, refer to the handbook of
the manufacturer.
The power distribution board controls all turbopumps via voltage levels.
Refer to topic “Power Distribution Board” on page 1-39. An interface
for RS485 data via the instrument control board connects the
turbopumps with the linear ion trap. (Refer to topic “Instrument
Control Board” on page 1-37.) The linear ion trap has a separate
turbopump controller.
The vacuum is monitored by several vacuum gauges:
• The forevacuum of the
LTQ Orbitrap XL is monitored
by an Active Pirani gauge
(TPR 280, manufacturer:
Pfeiffer) connected to the
LTQ Orbitrap XL forevacuum
line. See photo right and
Figure 1-16 on page 1-20.
• The high vacuum of the LTQ Orbitrap XL is monitored by a Cold
Ion Gauge (IKR 270, manufacturer: Pfeiffer) connected to the
UHV chamber. See Figure 1-17 on page 1-20. Since the gauge
would be contaminated at higher pressures, it is only turned on
when the forevacuum has fallen below a safety threshold
(