4 Operating in EI Mode
To Pumpdown the MSD
112 5977C GC/MSD Operating Manual
To Pumpdown the MSD
You can also use the 8890 or 9000 GC touchscreen to perform this task.
Procedure
1 Remove the analyzer window cover and open the analyzer cover. (See “To
Open the MSD Covers” on page 108.)
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 38 on page 113.)
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 85.) 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 22 before operating the MSD
with hydrogen gas.
WARNING
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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