To Pumpdown The Msd - Agilent Technologies 5977B Series Operating Manual

4 Operating in EI Mode

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"
Make sure your MSD meets all the conditions listed in the introduction to this
WA R N I N G
chapter before starting up and pumping down the MSD. (See
the MSD"
Never open the vent valve without first closing the hydrogen supply line to all
WA R N I N G
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
Agilent does not recommend using hydrogen as a carrier gas on systems equipped
C A U T I O N
with an IDP3 rough pump.


Procedure
1 Remove the analyzer window cover. (See
2 Verify that the foreline pump inlet valve is open.
Do not open the vent valve without verifying that the JetClean system hydrogen
WA R N I N G
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.
3 Verify that the vent valve is open by turning it clockwise until closed. (See
4 Open the vent valve by turning it counterclockwise 45 degrees. (See
116
on page 89.) Failure to do so can result in personal injury.
"Hydrogen Safety"
page 112.)
Figure 39 on page 117.)
Figure 39 on page 117.)
on page 23 before operating the MSD with hydrogen gas.
on page 81.)
"Before You Turn On
"To Open the MSD Covers"
5977B Series MSD Operating Manual

on