Reinstalling The Ion Source; Replacing The Filament Of The Tsq Quantum Xls Ion Source - Thermo Scientific TSQ Quantum GC User Manual

6
Maintenance

Replacing the Filament of the TSQ Quantum XLS Ion Source

Reinstalling the Ion Source

Replacing the Filament of the TSQ Quantum XLS Ion Source
102 TSQ Quantum XLS and TSQ Quantum GC User Guide
2. Use the retainer clip and threaded standoff to secure the lens assembly to the ion source.
See Figure .
IMPORTANT For accurate temperature readings of the heater block, fully screw the
threaded standoff into the ion source to ensure contact between the temperature
sensor with the heater block.
To reinstall the ion source into the vacuum manifold
1. Wearing clean, lint- and powder- free gloves, place the ion source onto the magnet yoke.
2. Position the ion source in the vacuum manifold and ensure the following:
• The transfer line is seated in the sample inlet aperture in the ion source.
• The two thumbscrews are aligned with the screw holes in the Q0 quadrupole mount.
See Figure 48.
3. Secure the ion source to the Q0 quadrupole mount by alternately tightening each
thumbscrew one-half turn at a time. Make sure there is no play in the ion source.
4. Reconnect the connectors to the lead pins on the EI/CI Source PCB, lens L1, L2, L3
assembly (the orientation is not important), and lens L4 assembly. See
5. Reinsert the capillary column into the ion source.
a. Using the I/R tool, remove the ion volume. See
page 69.
b. Push the column in until you can see it through the inlet valve.
c. Pull the column back just far enough that you cannot see it.
d. Tighten the transfer line nut and transfer line union.
e. Using the I/R tool, install the ion volume. See
page 76.
6. Close and secure the cover to the ion source vacuum manifold.
The number of ions produced in the ion source is approximately proportional to the filament
emission current. If ion production is lacking, you might have to replace the filament. If the
measured emission current is substantially less than the value that the emission current is set
to, or if the measured emission current decreases over time, then the filament has failed or is
failing and requires replacement.
Figure
"Removing the Ion Volume"
"Installing the Ion Volume"
48.
on
on
Thermo Scientific