Empower Tip #266 | Empower CDS User Question, Control Charts

By February 23, 2022

Tip #266: How to create a control chart to plot an attribute of a specified peak or remove a specified peak from a control chart

Welcome back! In this week’s tip for Empower Chromatography Data System (CDS),  we will answer an Empower CDS user question. In last week’s tip, we learned about calculations for Gradient Polymer Elution Chromatography (GPEC), Tip #265.

In this week’s tip, I will answer a question asked by numerous Empower users.

Q: How do I create a control chart to plot an attribute of a specified peak or remove a specified peak from a control chart?

Great question.

Let’s get started.

Step 1

In this example, we have a Control Chart to track retention time of peaks throughout a sample set. Acetone is a void volume marker and we do not want it included in the Control Chart (figure 1).

figure 1

Step 2

In the properties of the summary plot, we cannot create a peak level filter (figure 2).

figure 2

Step 3

If we add a white rectangle to the report and group it with the summary report, the composite group will allow us to create a peak level filter. Add the white rectangle to the report (figure 3).

figure 3

Step 4

Control click both groups and from the Edit menu, select ‘Group’ (figure 4).

figure 4

Step 5

From the Edit menu, select ‘Composite Properties’ (figure 5).

figure 5

Step 6

We can filter using a peak field (figure 6)

figure 6

Step 7

Create the condition to filter out the Acetone peak (figure 7).

figure 7

Step 8

Acetone has now been filtered out of the control chart (figure 8).

figure 8

It’s that easy!

Final Note: This can be done with either the Pro or QuickStart interface.


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Next time in Empower Tip #267– we will start a series on how Empower calculates Amount/Concentration.

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Categories: Empower Tips