Empower Tip: Review Window and the Processing Method

___________________________________________________________________________________

Recently I’ve received emails from some readers asking for tips on Intersample Custom Fields, particularly around summary functions. Let’s explore this topic starting with an understanding of what an Intersample Custom Field is and the syntax needed to make these calculations.

Tip 85 covered how to make a Simple Peak Custom Field. In that tip, we saw how to make a calculation for a peak in one chromatogram. What if we wanted to make a calculation involving a peak in one chromatogram and a peak in another chromatogram? That would be an Intersample Custom Field. (i.e., if I am monitoring a reaction and need to compare the peak area in the current batch to the peak area in a finished batch).

This week we will learn how to create Intersample Custom Fields (Part 11).

We see an overlay (stack plot) of the batch in progress and a finished batch. Our SOP states that we must compare the area of the Ethyl Paraben peak of the batch in process to the area of the Ethyl Paraben peak in the finished batch.

The syntax for Intersample calculations is seen in figure 2. The label and injection number come from the Sample Set Method. ‘The channel’ is the channel of data we have collected. ‘The field’ is the peak field of interest. We will explore some ‘short cuts’ you can take advantage of when using this syntax.

Since we will use specific labels in the equation, we set the Search Order to ‘Result Set Only’. The reason for this is because we want to calculate the results from within the current Result Set and do not want Empower looking for older Results with the same label in the project.

The equation makes use of the syntax, dropping the channel since it is the same channel of data throughout the Sample Set. That is one of the ‘short cuts’ we can take advantage of.

We see the reaction is only 67% complete at this point in time.

It’s that easy!