To Monitor Ci Mode High Vacuum Pressure - Agilent Technologies G7035A Operation Manual

To Monitor CI Mode High Vacuum Pressure

If you are using hydrogen as a carrier gas, do not turn on the Micro-Ion vacuum
WARNING
gauge if there is any possibility that hydrogen has accumulated in the manifold.
Read
carrier gas.
Procedure
1
2
3
The gauge controller will not turn on if the pressure in the MSD is above
approximately 8 × 10
all pressures listed in this manual are for helium.
The largest influence on operating pressure is the carrier gas (column) flow.
Table 20
flows. These pressures are approximate and vary from instrument to
instrument.
Typical pressure readings
Use the G3397B Micro-Ion vacuum gauge. Note that the mass flow controller is
calibrated for methane and the vacuum gauge is calibrated for nitrogen, so
these measurements are not accurate, but are intended as a guide to typical
observed readings (See
following set of conditions. Note that these are typical PCI temperatures:
Source temperature
Quad temperature
Interface temperature
Helium carrier gas flow
5977 Series MSD Operation Manual
"Hydrogen Safety" on page 19 before operating the MSD with hydrogen
Start up and pump down the MSD. See
Mode" on page 98.
In the Tune and Vacuum Control view select Turn Vacuum Gauge on/off from the
Vacuum menu.
In the Instrument Control view you can set up an MS Monitor for reading. The
vacuum can also be read on the LCP or from the Manual Tune screen.
-3
Torr. The gauge controller is calibrated for nitrogen, but
on page 118 lists typical pressures for various helium carrier gas
250 °C
150 °C
280 °C
1 mL/min
Operating in Chemical Ionization (CI) Mode
"To Pump Down the MSD in CI
Table 20 on page 118). They were taken with the
4
117