Thermo Scientific DSQ II, Hardware Manual

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Maintaining the DSQ II
Maintaining Components Outside the Vacuum Manifold
Thermo Scientific DSQ II Hardware Manual 81
7. Test the gas fittings for leaks.
a. Turn on the CI reagent gas supply.
b. Use a leak detector to check for leaks on the high-pressure side of the CI reagent gas
flow module.
c. Use the DSQ II to check for leaks on the low-pressure side of the CI reagent gas flow
module, as described in "
High Vacuum Symptoms" on page 135 .
d. Correct leaks by tightening or replacing the connections. Continue to check and
correct leaks until all connections are leak-free.
8. Reattach the left, top, and front covers of the DSQ II.
9. Restart the DSQ II.
10. Once the DSQ II has pumped down and is operational, check for vacuum leaks by
reading the convectron gauge and ion gauge and running an automatic tune.
Replacing the Conversion Dynode/Electron Multiplier Power Supply
To replace the conversion dynode/electron multiplier power supply, you will need a Phillips
#2 screwdriver.
1. Cover the work area with a lint-free cloth.
2. Shut down and vent the DSQ II, as described in "Shutting Down the GC/MS System"
on page 18 .
CAUTION - INSTRUMENT DAMAGE.
Do not use liquid soap leak detectors (such as
Snoop) to check for leaks. They may contaminate your system.
WARNING - ELECTRICAL SHOCK HAZARD. Before proceeding. unplug the DSQ II to
avoid an electrical shock.