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

Hi Milad,

Your problem is very strange.  What version of OpenLab are you using?  Is this the only method this happens with?

Could you attach the method and data files?  It would be very helpful if I could take a close look at both.

Tim

Dear Tim [hebgent],

Thank you so much for your reply.

I have attached the method and data files. Please find them. In this file, 7890-0505 HS Samples_unsaved changes.M is the method, high1.D is standard and 1D.0D is my sample.

Previously we didn't see this problem.

Milad

Hi Milad,

I looked at the method and data files and don't see anything wrong with them.  It is a bit unusual that you have the front detector listed as signal 2 and the back detector as signal 1 but there is no reason you can't specify it that way.

Since you are using a headspace there are all sorts of things that can cause no peaks (plugged lines / leaking lines / bad valves).  Can you confirm that you see peaks for the signals on the "Online Plot".  The data files look very much like blanks.

Tim

Hi Milad,

Is this a factory-tested analyzer?  The naming convention of the method is similar to a targeted analyzer that shipped with a factory tested method.  I'm guessing maybe for Greenhouse Gases?  From time to time, the valve timings and flows need to be verified due to column age and other variables.   

These systems have an adjustable needle valve just outside the valve box that can be sensitive to bumps.  I recommend following the setup instructions in the manual to measure flows in multiple valve positions and re-establishing the valve timings.  The manual ships on a CD-ROM with the valve diagram, checkout method, data, and other system-specific details.  Often, the service person performing the installation will put a copy on the PC for easy access. 

Also, double-check the method setpoints to verify none of the pressure sources have been accidentally turned off.  Also check your valve actuator air and verify the valves are actually firing during the injection and throughout the run.  Leaks or plugs are always a possibility.  This system probably has a headspace, so plugged probes are common along with leaks around the transfer line.  Running the headspace leak and restriction test from the headspace front panel will help you troubleshoot the headspace independent of the GC. 

There is a possibility the column(s) need to be replaced as well. 

Keep us posted!

Abbey

When u check the scale of the succesfull run its quiete different from the one u don't see any signal at all.

The second one is either a blank, or the compound didn't reach the detector.

I once had the problem that I selected the wrong detector at the end.

Dear Abbey,

Sorry for the late response,

Thank you so much for your explanation, it is like a guideline.

I checked out all process and everything looks fine. I just restart the program and windows and ran machine again. Surprisingly machine works and everything is okay. I am not sure what happened!

Thank you so much for your time,

Milad

Dear Tim,

Thank you so much for your message,

I am not sure what happened, I just restart the program and windows and ran machine again. Surprisingly machine works and everything is okay.

Thanks a lot,

Milad

Dear mr.white

Thank you so much,

I am not sure what happened, I just restart the program and windows and ran machine again. Surprisingly machine works and everything is okay.

Do you think I can use this method to get back my previous data that lost in the wrong running?

Thanks,

Milad

Dear mr.white

Thank you so much,

I am not sure what happened, I just restart the program and windows and ran machine again. Surprisingly machine works and everything is okay.

Do you think I can use this method to get back my previous data that lost in the wrong running?

Thanks,

Milad

The data u got from the last run was blank.

You can check if u selected the right signal.

You can try to go to your processing method and select all signal sources on the left hand.

Here u can see that FID1A and FID2B are selected

Maybe u deselect one by accident.