Baking Out The Analyzer; Replace Filament Unit; Tbl. 13: Maximum Bakeout Temperatures - Pfeiffer Vacuum PrismaPro QMG 250 Translation Of The Original

7. Check the connections of the deflector cage for deformation or contamination.
8. Check the electrical connections of the quadrupole mass filter for correct connection.
9. Check the high-frequency connections for correct connection.
9.3.2 Baking out the analyzer
Risk of burns during baking out
During or immediately after the baking out, the heating jacket and the metal surfaces near to the
heating jacket are extremely hot. The metal surfaces can reach a temperature of over 100 °C. This
causes burns if you do not wear suitable personal protective equipment.
► When baking out, always wear personal protective equipment (for example protective gloves).
► Never touch surfaces without suitable protective gloves, either during or directly after baking out.
Damage to the electronic unit (QME) caused by baking out
Excessively high temperatures damage the electronic unit.
► Dismantle the electronic unit from the analyzer (Q&A) before baking out at temperatures >
Damage to the electron multiplier (EM) caused by excessive temperatures
Switching on the electron multiplier at high temperatures will lead to permanent damage.
► Do not switch on the electron multiplier at analyzer temperatures > 150 °C.
Prerequisites
● Vacuum system with heater for baking out the analyzer
● Temperature which can be attained with the heater > 120 °C.
● High vacuum > 1 × 10
Detector type
Faraday
Faraday/EM combination
Tbl. 13:

Baking out the analyzer

1. Attempt to restore the normal performance by baking out the analyzer under a high vacuum for
2. Check the filaments and the ion source if the desired result is not accomplished by baking out the
3. Contact
9.4 Replace filament unit
– Contamination may not be immediately evident and can only be identified as a result of poor
performance.
WARNING
200°C.
-5 hPa
Maximum bakeout temperatures
several hours - at best overnight.
analyzer.
Pfeiffer Vacuum Service
Visual inspection before replacing the filament unit
Inspect and assess the complete ion source before replacing the filament unit. Pfeiffer Vac-
uum recommends replacing the complete ion source in the event of damage, significant de-
posits or soiling as well as signs of contamination (e.g. discoloration).
NOTICE
NOTICE
In operation
200 °C
EM mode 150 °C
Faraday mode 200 °C
if you cannot resolve the existing problem by doing so.
Maintenance
QME removed
300 °C
300 °C
300 °C
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