1Introduction
Precautions
7000/7010 Series TQ GC/MS Operating Manual 23
Precautions
Take the following precautions when operating a GC/MS system with hydrogen
carrier gas, or when operating the MS with the JetClean option that supplies
hydrogen to the MS from a MFC located on the analyzer.
Equipment precautions
General laboratory precautions
• Avoid leaks in the carrier gas, fuel gas, and in the optional JetClean system
lines. Use leak-checking equipment to periodically check for hydrogen leaks.
• Eliminate from your laboratory as many ignition sources as possible (for example,
open flames, devices that can spark and sources of static electricity).
• 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.
Once hydrogen has accumulated in a MS, extreme caution must be used when
removing it. Incorrect startup of a MS filled with hydrogen can cause an explosion.
After a power failure, the MS 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.
You MUST ensure the top thumbscrew on the front analyzer side plate and the
top thumbscrew on the rear analyzer side plate are both fastened finger-tight.
Do not over tighten the thumbscrews; this can cause air leaks.
You MUST leave the CC chamber top plate shipping brackets fastened. Do not
remove the shipping brackets from the top plate for normal operation; they
secure the top plate in the event of an explosion.
You MUST remove the plastic cover over the glass window on the front of the
analyzer. In the unlikely event of an explosion, this cover may dislodge.
Failure to secure your MS as described above greatly increases the chance of
personal injury in the event of an explosion.
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