Agilent Technologies 5975T LTM GC Operation Manual page 72

3
Operating in Electron Impact (EI) Mode
If you are using hydrogen as a carrier gas, do not turn on the Micro-Ion vacuum
WA R N I N G
gauge if there is any possibility that hydrogen has accumulated in the analyzer
chamber. Read
gas. Pump down for 25 minutes before you turn on the vacuum gauge.
72
"Hydrogen Safety" before operating the MSD with hydrogen carrier
5975T LTM GC/MSD Operation Manual