1 Introduction
26 5977B Series MSD Operating Manual
Precautions
Take the following precautions when operating a a GC/MSD system or GC/MS
system with hydrogen carrier gas or when operating the MSD with the
JetClean option that supplies hydrogen to the MSD analyzer.
General laboratory precautions
• Avoid leaks in the carrier gas lines. Use leak-checking equipment to
periodically check for hydrogen leaks.
• Eliminate as many ignition sources from your laboratory 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.
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 shutoff 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.
You must remove the plastic cover over the glass window on the front of a 5977B
Series MSD. In the unlikely event of an explosion, this cover may dislodge.
You MUST make sure the top thumbscrew on the analyzer side plate is fastened
finger-tight. Do not over tighten the thumbscrew; this can cause air leaks.
Failure to secure your MSD as described above greatly increases the chance of
personal injury in the event of an explosion.
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