Introduction 1
5977B Series MSD Operating Manual 27
• If a power failure occurs while the GC/MSD 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 MSD, 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 MSD to atmosphere.
6 Wait at least 10 minutes to allow any hydrogen to dissipate.
7 Start up the GC and MSD as normal.
When using hydrogencheck 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. Ensure the foreline pump exhaust and GC injection port vents are
both vented into a fume hood.
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