LTQ Orbitrap XL Hardware Manual

Vent Valve of the Linear Ion Trap
Functional Description
Gas Supply
The HCD collision gas is also led to a gas flow divider. Part of the gas is
led through a capillary line to the atmosphere (flow rate: ~20 mL/min).
The other part of the gas (flow rate: ~0.5 mL/min) enters the IN port of
a three way valve. The gas leaves the valve through the OUT port and is
led to the collision octapole next to the curved linear trap. 1 For the
HCD collision gas, red PEEKSil tubing is used (100 μm ID silica
capillary in 1/16 in PEEK tubing).
The HCD collision gas valve is located at the left instrument side next
to the temperature controller board. See Figure 1-20 on page 1-26. It is
switched by the software via the power distribution board. (See
page 1-39.)
If the system and pumps are switched off, the system is vented. The vent
valve is controlled by the linear ion trap. The LTQ XL Hardware Manual
contains further information about the vent valve.
The instrument is vented with nitrogen from the same tubing that
supplies the LTQ XL sheath gas. See Figure 1-19 above. The vent valve
of the LTQ XL is attached to a pressure regulator that is set to a venting
pressure of 3–4 psi. The pressure regulator is located at the left side of
the LTQ Orbitrap XL. See Figure 1-21.
Nitrogen pressure regulator
Figure 1-21. Nitrogen pressure regulator and gas flow divider
1 The third port of the valve is closed.
Gas flow divider
Thermo Fisher Scientific LTQ Orbitrap XL Hardware Manual 1-27