Introduction 1
Troubleshooting and Maintenance Manual 19
• Turn off the hydrogen at its source every time you vent the MS (do not heat
the capillary column without carrier gas flow).
• Turn off the hydrogen at its source every time shutoff valves in the MS are
closed (do not heat the capillary column without carrier gas flow).
• Turn off the hydrogen at its source if a power failure occurs.
• If a power failure occurs while the GC/MS system is unattended, even if the
system has restarted by itself:
1 Immediately turn off the hydrogen at its source.
2 Turn off the GC.
3 Turn off the MS and allow it to cool for 1 hour.
4 Eliminate all potential sources of ignition in the room.
5 Open the vacuum manifold of the MS to atmosphere.
6 Wait at least 10 minutes to allow any hydrogen to dissipate.
7 Start up the GC and MS as normal.
When using hydrogen gas, check the system for leaks to prevent possible fire
and explosion hazards based on local Environmental Health and Safety (EHS)
requirements. Always check for leaks after changing a tank or servicing the
gas lines. Always make sure the vent line is vented into a fume hood.
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