Agilent Technologies 7890A GC Safety Manual page 12

General laboratory precautions
• Avoid leaks in the carrier gas lines. Use leak-checking equipment to
• Eliminate from your laboratory as many ignition sources as possible (open
• Do not allow hydrogen from a high pressure cylinder to vent directly to
• Use a hydrogen generator instead of bottled hydrogen.
• Provide proper system ventillation as described in the Site Prep manual.
Operating precautions
• Turn off the hydrogen at its source every time you shut down the GC or
• Turn off the hydrogen at its source every time you vent the MSD (do not
• Turn off the hydrogen at its source every time isolation valves in an MSD
• 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
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.
12
periodically check for hydrogen leaks.
flames, devices that can spark, sources of static electricity, etc.).
atmosphere (danger of self-ignition).
MSD.
heat the capillary column without carrier gas flow).
are closed (do not heat the capillary column without carrier gas flow).
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.
7890A GC Safety Manual