Axis BTA 2100D Manual do Operador descarregar pdf (Página 76)

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You must select a method segment that is not a Filament/multiplier delay

segment for the ion trap to be enabled. This method and segment selection is

located in the center of the screen. This center section deals with the active

method and the instrument set points.

The ion trap symbol is a pictorial representation of the ion trap showing the

endcaps (two horizontal curved lines), the rf-voltage ring electrode (two vertical

curved lines), the electron multiplier (a curved cone), the filament (a triangle), the

tank for the CI reagent gas, and the reservoir for the calibration compound. By

clicking on the appropriate part of the ion trap symbol, or by clicking on the

corresponding button, you can turn on and off the various parameters shown in

the symbol (i.e. click triangle to turn on filament). Click in the center of the trap

and the Cal Gas bulb, a spectrum of PFTBA will be displayed.

Method

Now notice the three tabs in the center of the System Module: Method,

SetPoints and Adjustments. There is always an active method controlling the

GC/MS system. This method is the last method selected from a previous use or

the default method if the instrument is just being configured. In the default

method, the first MS Method Segment defines a "Filament/Multiplier Delay."

When such a segment is active, the trap controls are forced off and scans are

not taken to protect the trap from solvent peaks that elute shortly after injection.

This kind of segment is specified in the method by selecting an Ionization Mode

of "None." When such a segment is active in Manual Control, the trap icon

appears red, indicating that the trap is off and that its state cannot be changed.

To actually take (and display) scans, an MS Segment must be specified that has

an Ionization Mode of other than "None." Once this is done, the color of the trap

icon will return to black and the trap may again be turned on by clicking on the

trap icon. (Note that the trap icon may also temporarily appear red while the

system is initializing). Below the method button is the segment number. Click the

up arrow to select segment 2. See Saturn Method Editor for more information on

methods.

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