4Operating in EI Mode
116 5977B Series MSD Operating Manual
To Pumpdown the MSD
You can also use the 7890B GC control panel to perform this task. (See
“Operating the MSD from the GC control panel” on page 81.)
Procedure
1 Remove the analyzer window cover. (See “To Open the MSD Covers” on
page 112.)
2 Verify that the foreline pump inlet valve is open.
3 Verify that the vent valve is open by turning it clockwise until closed. (See
Figure 39 on page 117.)
4 Open the vent valve by turning it counterclockwise 45 degrees. (See
Figure 39 on page 117.)
Make sure your MSD meets all the conditions listed in the introduction to this
chapter before starting up and pumping down the MSD. (See “Before You Turn On
the MSD” on page 89.) Failure to do so can result in personal injury.
Never open the vent valve without first closing the hydrogen supply line to all
possible sources of hydrogen entry to the analyzer. This requires closing the
hydrogen shutoff valve to the carrier gas flow module and the shutoff valve to the
JetClean system supply if either of these hydrogen sources exist on the instrument.
Read “Hydrogen Safety” on page 23 before operating the MSD with hydrogen gas.
Agilent does not recommend using hydrogen as a carrier gas on systems equipped
with an IDP3 rough pump.
Do not open the vent valve without verifying that the JetClean system hydrogen
supply shutoff valve is closed if the optional JetClean system is installed. Refer to
the JetClean system Operating manual for warnings regarding hydrogen safety
when the hydrogen shutoff valve is open.
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