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Re: Varian CP-3800 GC - Hasn't been used for 10 years
Posted: Fri Apr 26, 2013 7:16 pm
by lisa.stafford
Hi Cleh,
Where on the transfer line should the O-ring be? Are you referring to the tiny one inside the ferrule that the column passes through before it enters the transfer line heater?
Thanks for your help!
Lisa
Re: Varian CP-3800 GC - Hasn't been used for 10 years
Posted: Mon Apr 29, 2013 7:08 am
by Peter Apps
Hi Lisa
Until you have the MS working there is absolutely no point in connecting CO2 to the GC - what does your boss think that it is going to achieve at this stage ?
The "tiny O-ring" where the column goes in is actually a ferrule - it does the same job but is a different shape. Nonetheless, given the history someone might have tried poking a little o-ring in there. O-rings are round in cross section and soft and elastic, ferrules are tapered and either hard or so soft that you can squash the with your fingers but unlike most o-rings they do not spring back.
You will find that there is a rubber O-ring where the transfer line joins the body of the MS - that one could well need replacing.
Peter
Re: Varian CP-3800 GC - Hasn't been used for 10 years
Posted: Mon Apr 29, 2013 2:14 pm
by cleh
Hi Cleh,
Where on the transfer line should the O-ring be? Are you referring to the tiny one inside the ferrule that the column passes through before it enters the transfer line heater?
Thanks for your help!
Lisa
Hi Lisa,
I'm referring to the O-ring that goes on the transfer line that Peter described. Also agree with Peter about the CO2.
Re: Varian CP-3800 GC - Hasn't been used for 10 years
Posted: Mon May 13, 2013 1:12 pm
by FCCHEESE
How is the saturn 2000? I would suggest you get an engineer to have a look at it before you go much further. They were always problematic, a big issus is contmination of the trap and blown filaments. If Liquid CO2 was used in the past it should have the correct valves pre-installed. The L CO2 is likely to have been used to cool the injector but may also have been installed to cool the column oven on a 3800. You should not have to much difficulty getting parts for this instrument as a lot were sold. The big issue is that none of the current libriaries are bases on ion-traps and therefore you really need to know what your working with, ie no good for identifying unknowns. Also it is possible for another detector to be installed but it would be easy to see it, if there its likley to be an FID.
Re: Varian CP-3800 GC - Hasn't been used for 10 years
Posted: Wed Jun 05, 2013 6:16 pm
by anamariboyes
Hi Lisa
I use a 3800 and it has an FID detector on it, although I don't use it and have a Saturn 2200 MS.
One thing I had an issue with when I had turbo pump problems was the o ring that holds the turbo pump hose. It is inside the clamp and is specialized. You need to have the exact one or you will not create vacuum.
Good luck