Calibrating High Frequency And The Mass Scale; Factory Calibration; Fig. 31: Replacing The Grid Ion Source - Pfeiffer Vacuum PrismaPro QMG 250 Translation Of The Original

Fig. 31:
1 Screw of wiring (4×)
2 Fixing screw of the ion source (3×)
Disassembling the ion source
1. Place the analyzer in the mounting aid.
2. Hold connections with the flat pliers.
3. Loosen and remove the screws of the wiring.
4. Loosen and remove the fixing screws of the ion source.
5. Carefully pull the ion source away from the quadrupole rod system.
6. Inspect the ceramic insulators of the ion source wiring for damage.
Installing the ion source
1. Place the analyzer in the mounting aid.
2. Carefully remove the ion source from the transport packaging.
3. Place the new ion source onto the quadrupole rod system.
4. Fasten the fixing screws of the ion source.
5. Feed the screws of the wiring through the eyelets of the wiring.
6. Hold the ion source connections with the flat pliers.
7. Tighten the screws of the wiring in the connections of the ion source.
8. Check the wiring of filament and ion source.
9. Check the filaments and the ion source by way of resistance measurement.
Setting parameters in the operating software to 0 (zero)
► Set the pressure cut-off meter of the ion source to 0 (zero) in uCon with the command U204.
9.6 Calibrating high frequency and the mass scale
Pfeiffer Vacuum calibrates the HF/DC ratio of a PrismaPro such that only one mass can pass the quad-
rupole mass filter at a given HF/DC ratio. The HF/DC ratio for each mass selected is precisely deter-
mined by fine calibration.
9.6.1 Factory calibration
At the factory, Pfeiffer Vacuum aligns the PrismaPro to different masses to its mass range.
1
2
Replacing the grid ion source
(M1.6, flat head)
(M2×3, crosshead, stainless steel, gold-plated)
– Tightening torque: 0.40 Nm
– Tightening torque: 0.15 Nm
– Alternatively, enter "/mmsp/sensorIonSource/tPTripCount/set?0" in the web browser and con-
firm with Enter.
Backup copy of the hardware configuration file
Create a backup copy of the hardware configuration file for the analyzer on the test com-
puter, using the PV MassSpec hardware configuration, before carrying out the settings. If
necessary, the original settings can be restored from the backup copy.
3
3 Grid ion source
Maintenance
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