Operating in Electron Impact (EI) Mode 3
5975 Series MSD Operation Manual for MassHunter 95
To Pump Down the MSD in EI Mode
You can also use the Local Control Panel to perform this task. See “Operating
the MSD from the LCP” on page 53.
Procedure
1 Remove the analyzer window cover (see “To Remove the MSD Covers” on
page 83).
2 Close the vent valve by turning the knob clockwise. .
3 Plug in the MSD power cord.
4 Press the Power on button on the front of the MSD.
5 Press lightly on the side board to ensure a correct seal. Press on the metal
box on the side board.
The foreline pump will make a gurgling noise. This noise should stop within a
minute. If the noise continues, there is a large air leak in your system,
probably at the side plate seal, the interface column nut, or the vent valve.
6 Start the MassHunter Data Analysis program.
7 In the Instrument Control view, from the Instrument menu, select MS Vacuum
Control to display the Vacuum Control dialog.
WARNING
Make sure your MSD meets all the conditions listed in the introduction to this
chapter (page 60) before starting up and pumping down the MSD. Failure to do so
can result in personal injury.
WARNING
If you are using hydrogen as a carrier gas, do not start carrier gas flow until the
MSD has been pumped down. If the vacuum pumps are off, hydrogen will
accumulate in the MSD and an explosion may occur. Read “Hydrogen Safety” on
page 21 before operating the MSD with hydrogen carrier gas.
To Next Page
Loading...
Need help?
General
