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Chemical Ionization Options
Adjusting Flows of CI Reagents
There are two ways to turn Channels of the MCI Module On and Off. The
simplest way, which you may want to use when you are adjusting CI flows, is
from the keyboard of the GC. The second way is to program a GC/MS Method in
the Saturn GCMS Workstation software and download the method to the GC. To
select reagent Channels, first identify which External Event is connected to
Channel A, B, or C. If you have a 3800 GC, make sure that these External
Events are configured from the GC keyboard.
Selecting Reagent Channels from the 3400/3600 GC Keyboard
To program reagent Channels from the 3400/3600 GC keyboard, select the
External Event (or Relay) for the chosen Channel by using the command
Program…Relays
from the keyboard. If no relays are currently active, the
display will read, “Initial Relays -1-2-3-4”. If you are activating Channel A
connected to External Event 2, press 2 and Enter on the numeric keyboard. The
display will change to reflect that Relay 2 is On. You may check the status of the
relays at any time from the GC keyboard by pressing Status … Relays. In this
example, you would then see the display “Relays On: 2”. You can adjust each of
the CI reagents installed in the MCI Module by turning on the appropriate relay
from the GC keyboard, then using the procedures in
Setting CI/MS Parameters
in the MS Method Editor
and in
Adjusting Reagent Flow for Each CI Reagent
to adjust CI reagent flows.
Selecting Reagent Channels from the 3800 GC Keyboard
To program reagent Channels from the GC keyboard, select the External Event
(or Valve) for the chosen Channel by using the command
Sample
Delivery…Valve States
from the keyboard. If no relays are currently active, the
display will show all Valves in the - State (Off). If you are activating Channel A
connected to Valve 1, use the arrow keys to highlight Valve 1 and the Inc. or
Dec. key to toggle the State to +. The display will change to reflect that Valve 1 is
On (+). You may check the status of the relays at any time from the GC keyboard
by pressing
Sample Delivery…Valve States
. You can adjust each of the CI
reagents installed in the MCI Module by turning on the appropriate Valve from
the GC keyboard, then using the procedures in
Setting CI/MS Parameters in
the MS Method Editor
and in
Adjusting Reagent Flow for Each CI Reagent
to
adjust CI reagent flows.
Setting up the Method for 3400/3600 GCs
You may adjust the flows of CI reagents from the Manual Control screen of the
Saturn System Control Module. However, for the correct Channel of the MCI
Module to be selected for adjustments, the GC/MS method should have the
correct Channel selected in the GC Relays section of the Method.
Using the Star Toolbar or the
Start…Programs…Saturn GCMS Workstation
menu, open the Method Builder application. The Method Directory is shown on
the left side of the window, as shown below. Only the relevant sections for 3400
GC and Saturn 2000 control are shown in this example. (Relays in 3600 GC
Control are adjusted in the same way as in the 3400 GC).
