Warning: calibrated compound not found (GC-7890b)

Is it possible that your retention times shifted causing the peaks to fall out of their windows?

Dear Abdur,

Thank you so much for your time and reply.

If I understood your question correctly, I checked out the temperature and carrier gas first. Also, I checked it out during running, everything about the machine was going correctly.

I could see peaks for each gas in each sample. I checked the result out when machine work has been finished, I can't see peaks or amounts in the result file. It is reported for all samples "Warning: calibrated compound not found".

Also, I saw these signals in the software, for each sample is like these images when I click on the signal part.

FID:

ECD:

Thank you so much,

Milad

No,

But it was like this image:

Always we could saw 3 peaks for each sample during running.

Thank you so much,

Milad

Those signals just look like blank runs.  Do you have a screenshot of the peaks that you saw during the run?

Those signals just look like blank runs.  Do you have a screenshot of the peaks that you saw during the run?

No,

But it was like this image:

Always we could saw 3 peaks for each sample during running.

Thank you so much,

Milad

Dear hennindm

Thank you so much for your reply.

How I can fix it? Do you have any solution and would you able to help me?

Thanks,

Milad

Verify the signal you are collecting is the signal in your calibration. I.e. you may be seeing signal A in the real time window, collecting signal A but calibrated with signal B.

Verify what signal you are saving....Detector 1 is being saved as Signal A....This is under the instrument conditions tab that follows the detector temp and flow settings (I am away from the lab right now, so I can't look at ChemStation). If you look at your calibration table, it should say signal A or signal B in one of the columns. You may need to change the Calibration table view to see this column. There are several different calibration table views.

Alternatively, "EDIT Entire Method"  You will reach a window that asks what signal will be used for calibration...You can change it here as well. 

If you look at the Real Time window, top left corner, you can see if this is signal A or B that you are viewing in real time.