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

5 Operating in CI Mode

To Pumpdown the MSD in CI Mode

This procedure assumes that the instrument will eventually be PCI tuned
using methane after the system is stable.
Procedure
1 Follow the instructions for the EI MSD. (
2 In the Manual Tune dialog, click the Values tab to monitor that the pressure is
3 In the Manual Tune dialog, click the CI Gas tab, then in the Valve Settings area
4 Verify that PCICH4.U is loaded (top left in Manual Tune dialog) and click the
5 Set the GC/MSD interface to 280 °C. (See
6 Set Gas A (methane) to 20%.
7 Let the system bake out and purge for at least 2 hours. If you will be
124
page 116.)
After the software prompts you to turn on the interface heater and GC
oven, perform the following steps.
decreasing (Hi-Vac gauge option installed).
close Gas Valve A, Gas Valve B, and the ShutOff Valve.
Values tab to accept the temperature setpoints.
Always start up and verify system performance in PCI mode before
switching to NCI.
running NCI, for best sensitivity, bake out the MSD overnight.
See
"To Pumpdown the MSD"
Table 11 on page 123.)
5977B Series MSD Operating Manual
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