To Monitor Ci Mode High Vacuum Pressure - Agilent Technologies 5977B Series Operating Manual

To Monitor CI Mode High Vacuum Pressure

IIf hydrogen is used as a carrier gas or JetClean system supply, the carrier and
WA R N I N G
JetClean system supply shutoff valves must be closed before turning off the MS
power. If the foreline pump is off, hydrogen will accumulate in the MS and an
explosion may occur. Read
with hydrogen gas.
Procedure
1 Start up and pumpdown the MSD. (See
2 In the Tune and Vacuum Control view select Turn Vacuum Gauge on/off from the
3 In the Instrument Control view you can set up an MS Monitor for reading. The
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.
Typical pressures for various helium carrier gas flows are approximate and
vary from instrument to instrument. (See
Typical pressure readings
Use the G3397B Micro-Ion vacuum gauge. Note that the MFC 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
5977B Series MSD Operating Manual
on page 124.)
Vacuum menu.
vacuum can also be read on the LCP or from the Manual Tune screen.
-3
"Hydrogen Safety"
"To Pumpdown the MSD in CI Mode"
Torr. The gauge controller is calibrated for nitrogen, but
Table 15
Table 15 on page 142.) They were taken with the
250 °C
150 °C
280 °C
1 mL/min
Operating in CI Mode
on page 23 before operating the MSD
on page 142.)
5
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