1Introduction
Precautions
5977C GC/MSD Operating Manual 25
Failure to secure your MSD as described above greatly increases the chance
of personal injury in the event of an explosion.
If hydrogen is plumbed to any connection on the GC or MS:
• The hydrogen supply to the system entry connection(s), such as from the
hydrogen gas cylinder, hydrogen generator or other hydrogen supply,
must be shut off when the system is powered off/vented.
• During the venting process it is important to open the manual vent valve.
• Before pumping the MS system down: Open the analyzer/sideplate
door(s) 45 degrees or more for 10 minutes before powering the MS
system on to begin the pump down process. This action is intended to
prevent accumulation of hydrogen within the MS analyzer before MS
power on in the event of a hydrogen leak.
MS Gas Flow:
Never exceed 50 mL/min of total H
2/methane flow to the MS, including
column and/or reagent gas.
Foreline Pumps:
Use only Agilent approved pumps.
• Agilent IDP pumps must be purchased through Agilent with GC/MS part
numbers (i.e., part number begins with “G”) reflecting their compatible
use with Agilent GC/MS systems. Pumps ordered directly through Agilent
Vacuum division or another provider may not have the correct gas ballast
installed.
• Agilent IDP pumps must be fitted with the supplied inlet valve that will
close in a power outage.
• Pfeiffer Duo and MVP pumps should be operated with gas ballast closed
with Agilent GC/MS systems.
• Edwards RV5 pumps should be operated with gas ballast closed with
Agilent GC/MS systems.
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