How to plot the system pressure in TrendPlot - WKB222007

OBJECTIVE or GOAL

Set up the system pressure plot in TrendPlot.

ENVIRONMENT

• MassLynx
• TartgetLynx
• TrendPlot

PROCEDURE

TrendPlot can be used to plot the system pressure to monitor the performance of a column over time. In order to do this the system pressure should first be calculated in TargetLynx. Of course it is mandatory to have the system pressure recorded as part of the inlet method of the BSM or QSM:

Calculation of system pressure in TargetLynx:

1. In the TargetLynx method, add a compound by selecting Add from the compound drop-down menu.
2. Name this compound "System Pressure".
3. Open a chromatogram from the sample list. When the system pressure is not opened, this can be done by clicking "Display" and "Analog":
   
4. With the TargetLynx method editor still open, right-click and drag across the top of the system pressure profile:
   
5. With the System Pressure trace imported in the TargetLynx methods, the integration settings should be set in order that only a very small portion of the system pressure is integrated. The Retention Time Window may be set to 0.1 or 0.2 minutes, and smoothing should be switched off because this may give a seemingly lower system pressure. The integration should look something like the following:
   
6. With everything set in TargetLynx, you can now import the data in TrendPlot.

To plot the system pressure in TrendPlot:

1. Click on the TrendPlot icon in the TargetLynx sidebar in MassLynx.
2. Open the Report Editor by clicking Reports > Edit.
3. Follow the procedure for editing a TrendPlot graph. For more information, consult the Help file in MassLynx and search for "TrendPlot Template". 
4. Under Y Axis, use the following settings:
   
5. Other settings can be set as required. The plot may look like the following:
   

ADDITIONAL INFORMATION