Agilent Technologies 7000 Triple Quadrupole GC/MS, Maintenance Manual

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94 Troubleshooting and Maintenance Manual
4
General Maintenance
To remove/install the ion vacuum gauges
Each MS contains two ion vacuum gauges; one for the analyzer chamber
pressure and one for the foreline pump entrance.
WA R N I N G
Make sure the GC/MS interface and the analyzer zones are cool (below 100 °C)
before you vent the MS. A temperature of 100 °C is hot enough to burn skin; always
wear cloth gloves when handling analyzer parts.
WA R N I N G
If you are using hydrogen as a carrier gas, the carrier gas flow must be off before
turning off the MS power. If the foreline pump is off, hydrogen will accumulate in the
MS and an explosion may occur. Read
“Hydrogen Safety” before operating the MS
with hydrogen carrier gas.
WA R N I N G
The turbo pump can cause burns if touched when operating. Make sure the pump
has time to cool before touching.
C A U T I O N
Never vent the MS by allowing air in through either end of the foreline hose. Use the
vent valve or remove the column nut and column.
Do not vent while the turbo pump is still spinning at more than 50%.
Do not exceed the maximum recommended total gas flow. See Table 2 .
WA R N I N G
Make sure your MS meets all the conditions listed in the Pump Down section of the
Agilent 7000 Series Triple Quad GC/MS Operation Manual
before starting up and
pumping down the MS. Failure to do so can result in personal injury.
C A U T I O N
During pumpdown, do not push on the filament board safety cover while pressing on
the analyzer boards. This cover was not designed to withstand this type of pressure.