Clarity discussion forum

Dear colleagues,

I would like to know if it is possible to calculate a breakthrough time and
use that parameter for a calculation. To give you additional details:

Thermal desorption tubes are added to the carrier gas line of a GC. The
carrier gas contains a certain amount of analyte. Until the maximum
capacity of the desorption tube is reached, there will only be a baseline.
At the time of breakthrough the analyte concentration increases quickly
until it reaches its original concentration level of the analyte in the
carrier gas. My client wants to calculate the breakthrough time (a certain
signal height) multiply it with a certain concentration factor and divide
with a variable, which is determined every day. Can this be automated in the
data analysis section of Clarity?

Thanks for your advice.

Best Regards,
Ingo Christ
CHROMSYS

Dear Ingo,

the calculation can be performed by using the user columns in result table, as there are variables in the sample header (Sample amount, Dilution, ISTD amount) which can be used for the calculations. The problem will be with the determination of the breakthrough time - the only suggestion I have is to use two channel board. You can use an event trigered by first signal value to create a pulse on Clarity digital output, connected to the second signal input. This pulse can be evaluated and the determined retention time used in the calculation.

Best regards

Ivan Vins

DataApex