5 Operating in EI Mode
To Set the CC Gas Flow Rates
7000/7010 Series TQ GC/MS Operating Manual 115
To Set the CC Gas Flow Rates
1 From the Agilent MassHunter GC/MS Acquisition software Instrument
Control panel, select Instrument > GC Parameters.
2 Click the Columns icon to display the control parameter entry screen for
column and Aux flow modules. (See Figure 37 on page 116.)
3 Select Collision Cell EPC in the description list.
4 Enter the required gas flow rates in the appropriate field.
5 Click the He Quench Gas On check box to allow the He quench gas flow. Click
the N2 Collision Gas On check box to allow the N2 collision gas flow.
6 Click Apply to download the setpoints or OK to download the setpoints and
close the window.
7 To make the new settings part of the method, select Save from the Method
menu.
Helium should only be used as a quench gas in the CC when it is also used as
the carrier gas. When hydrogen is being used as the carrier gas, turn off the
helium flow to the CC, and cap off the helium input line with a leak-tight fitting.
You must manually set the collision gas flow to on when in manual tune. Set
the system to the same conditions [Column flow(s), Collision Cell flows, and
MS analyzer temperatures] that will be used for data acquisition. Wait
sufficient time for system thermal equilibrium.
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