Disappearing chromatograms

Hi, I have a problem (not easily found on this forum) in openlab CDS where the last injection is disappearing after the sequence of injections.  This is the third occurence in 3 months and I don't see a pattern to it or what might be causing this.  I have screenshots below where you can see on the online signal window that the injected run has indeed run but then it does not show up in the data processing list of injections.  What could cause this that I can fix or work around?  The software product  # is M8410AA.  Thanks, PJ

July 08, 2021                                                                                                                                                                            August 17, 2021

  • HI

    Have a look at the various log files:

    • Result set log in Data Analysis - Processing tab
    • System activity log in control panel

    What does the sequence table look like.  Is the missing injection deselected in the sequence table?

    Kind regards

    Andy

  • HI

    Have a look at the various log files:

    • Result set log in Data Analysis - Processing tab
    • System activity log in control panel

    What does the sequence table look like.  Is the missing injection deselected in the sequence table?

    Kind regards

    Andy

  • Hi Andy,

    Had a look in both logs and no sign of my missing last injections there.  Where can you see what the sequence table looked like? I could not find any instructions on how to see past sequence tables.

    Thanks,

    PJ

  • Hi

    Assuming you don't use the same sequence over and over again, you can open a previous sequence in Acquisition.  If you have used the same sequence over and over again, maybe you have the sequence audit trails enabled; you could open the sequence and check out the audit trail from the General section of the sequence table.

    Andy

  • Hi Andy,

    So how do you see past sequence tables?  I do not use the same sequence more than once, if that helps. I can open a previous sequence and then what?  I'll enable the audit trail for sequences now that I know about it and update this string if the disappearing chromatogram strikes again.   

    Thanks,

    PJ 

  • HI

    Open sequence in acquisition:

    I wonder if we're not talking about the same thing...

    Andy

  • Hi, I had another occurence of the dissapearance of most of a day's worth of injections. Unfortunately instead of getting urgent help, I'll take this up on forums again for the benefit of anyone else who might be experiencing this and because I don't have another choice for troubleshooting many of the issues found so far.  I'd gladly prefer phone or in person assistance. 

    So I see the last advice had to do with opening a previously saved sequence?  Starting with the last suggestion, my audit trail for sequences was not on (is there a way to keep this on? I thought this was a robust audit ready software.) and as I mentioned there were no clues in the logs.  

    Now I have a screenshot of my sequence (created correctly), and the activity log which shows that the evening (around 8pm) injections did run.  And in data analysis the injections stopped somewhere mid-day around 2pm.  There are no error logs until after the shutdown method which also ran and stopped the machine properly around 8:30pm.  

    Where can I: a) find my injections, or 

    b) find the problem that has potentially wasted 6 hours of solvent, lamp time and my preparation work.

    Thank you,

    PJ

  • Hi

    Don't think I have an answer to the full question, but

    Starting with the last suggestion, my audit trail for sequences was not on (is there a way to keep this on? I thought this was a robust audit ready software.)

    Have a look at the project settings.  In a new project, the default is for sequences to not have audit trails enabled.  In my project, I have checked the "Automatically enable..." option.

    After enabling automatic audit trails, only new sequences will have them enabled.

    Maybe OpenLab is having a problem uploading your results.  Have a look at the Upload queue:

    You might be able to see results stuck in the queue

    This one is empty, of course !

    /Andy

Was this helpful?