12 7890A GC Safety Manual
Introduction
You must remove the plastic cover over the glass window on the front of
a 5975 MSD. In the unlikely event of an explosion, this cover may
dislodge.
General laboratory precautions
• Avoid leaks in the carrier gas lines. Use leak- checking equipment to
periodically check for hydrogen leaks.
• Eliminate from your laboratory as many ignition sources as possible
(open flames, devices that can spark, sources of static electricity, etc.).
• Do not allow hydrogen from a high pressure cylinder to vent directly to
atmosphere (danger of self- ignition).
• Use a hydrogen generator instead of bottled hydrogen.
• Provide proper system ventilation as described in the Site Prep manual.
Operating precautions
• Turn off the hydrogen at its source every time you shut down the GC
or MSD.
• Turn off the hydrogen at its source every time you vent the MSD (do
not heat the capillary column without carrier gas flow).
• Turn off the hydrogen at its source every time isolation valves in an
MSD 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/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.
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