By Anonymous on Friday, April 2, 2004 - 07:02 am:
Dear All,
I have an Autosystem XL GC with FID detectors.
I have found that after approx. 4-5 years the collector assembly (chimney,ignitor,signal contact etc.) needs replacing. This is because noise spikes start to appear in my chromatograms which don't improve with replacing the jet or nozzle etc.
Has anyone had this problem before?
Have you cleaned it in some way to reverse the problem?
Do you find this is a problem with other manufacturers?
Thanks for any answers
GC Dave.
By Anonymous on Monday, April 5, 2004 - 08:28 am:
Are your insulators doing their job?
Where are the shorts occurring in the detector that give the spiked signals?
By Anonymous on Tuesday, April 6, 2004 - 02:34 am:
The Autosystem XL FIDs have a ceramic spacer which I could replace first. I think I have tried this before. The metal parts of the nozzle certainly get very burnished. Can they be sanded effectively?
The collector assembly has contacts inside the head which presumably corrode over a period of time.
I will try your ceramic spacer suggestion first
GC Dave
By Anonymous on Tuesday, April 6, 2004 - 05:17 am:
By all means clean your contacts and remove all corrosion from metal parts. Good luck.
By Anonymous on Tuesday, April 6, 2004 - 05:36 am:
I should have said that the noise spikes are more noticable at 70 degC and then "disappear" into the baseline at about 90-100 degC in the ramp.
GC Dave
By Anonymous on Tuesday, April 6, 2004 - 08:24 am:
Or you using a plot cap column?
By Anonymous on Wednesday, April 7, 2004 - 05:17 am: