76 5977 Series MSD Operation Manual
3 Operating in Electron Ionization (EI) Mode
To Vent the MSD
Procedure
1 In Instrument Control view select GC Parameters from the Instrument menu to
display the GC Edit Parameters dialog. Select Oven and set the oven
temperature to room temperature. Also select Aux Heaters (MSD Transfer line)
and Inlets
and set those temperatures to room temperature. Click OK to close
the dialog and send this temperature to the GC.
2 In Instrument Control view select Edit Tune Parameters from the Instrument
menu to display the Manual Tune dialog.
3 Select the Values tab and set the MS Source and MS Quad temperatures to
ambient (room temperature) and click Apply to download these settings to
the MSD.
WARNING
If you are using hydrogen as a carrier gas, the carrier gas flow must be off before
turning off the MSD power. If the foreline pump is off, hydrogen will accumulate in
the MSD and an explosion may occur. Read “Hydrogen Safety” on page 19 before
operating the MSD with hydrogen carrier gas.
CAUTION
Be sure the GC oven and the GC/MSD interface are cool before turning off carrier gas
flow to prevent damage to the column.
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