24 5975 Series MSD Operation Manual for MassHunter
1 Introduction
Precautions
Take the following precautions when operating a GC/MSD system with
hydrogen carrier gas.
Equipment precaution
You MUST make sure the front side-plate thumbscrew is fastened finger-tight.
Do not overtighten the thumbscrew; it can cause air leaks.
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.
WARNING
Once hydrogen has accumulated in a mass spectrometer, extreme caution must be
used when removing it. Incorrect startup of a mass spectrometer filled with
hydrogen can cause an explosion.
WARNING
After a power failure, the mass spectrometer may start up and begin the pumpdown
process by itself. This does not guarantee that all hydrogen has been removed from
the system or that the explosion hazard has been removed.
WARNING
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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