Hi Neil,

In the event it is the solenoids, I just finished an order for a set of them for our Eurovector (Euro EA 3000). In our case, one of the two O2 solenoids was not opening. Lightly tapping the solenoid while the cycle was starting helped it open and confirmed it was faulty. The part number and cost for all the solenoids in the above Eurovector EA:

EA201236 Electrovalve (1pcs)  US$ 250.00

I contacted Eurovector via email through the contacts page on their website. Good luck.

andy


Andrew Schauer
206.543.6327
[log in to unmask]
http://depts.washington.edu/isolab/

					.

On Sep 23, 2013, at 2:22 AM, NEIL OGLE <[log in to unmask]> wrote:

> Thanks for all the replies.  So it seems my O2 quality is no problem, however similar to others it does have a long distance to travel therefore the line needs to be bled and blanks run before the N2 comes down, my problem is I dont believe its down far enough. So plan of action is to temporarily move a bottle of spare O2 next to the machine (Air Products UHP) and see if that makes a difference, if not I'll attack the solenoid.  My feeling is that it is indeed the latter.
>  
> NB  All this is really moot anyway as admin being what it is I didnt get the mail that the electric was being switched off briefly over the weekend so you can imagine the problems that has brought.  Hopefully only time lost but I dont like the speed the vacuum is coming down on the Isoprime. Anyway thanks again all and I'll let you know how it all pans out
>  
> Neil 
>  
> Dr Neil Ogle
> Stable Isotope Facility
> School of Planning, Architecture and Civil Engineering
> QueenS University Belfast
> David Keir Building
> Stranmillis Road
> Belfast
> BT9 5AG
> Northern Ireland
> 
> From: Claudia Keitel <[log in to unmask]>
> To: [log in to unmask] 
> Sent: Saturday, 21 September 2013, 6:13
> Subject: Re: [ISOGEOCHEM] O2 quality
> 
> Hi Neil,
>  
> I also had problems with high N2 blanks and couldn’t find a leak in the plumbing. I am using a FlashHT which probably has a completely different set up to the Eurovector, but here is what I saw: to test if the leak was in the oxygen line, I turned the autosampler off (like Nick suggested) and changed injection time of O2 (in the FlashHT, the amount of O2 injected is controlled by either flow rate or seconds injected). When I doubled the injection time, the N2 blank peak doubled in size. It turned out to be a leaky solenoid valve in the EFCt module which controls oxygen injection. When the valve was replaced, the N2 background was much reduced. Interestingly, I had a small blip in the TCD trace when this valve switched which had not been there before my N2 blanks got so large. This also disappeared with the replaced valve.
>  
> Good luck,
> Claudia
>  
>  
>  
>  
> From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Nick, Elemental MS Inc.
> Sent: Saturday, 21 September 2013 3:30 AM
> To: [log in to unmask]
> Subject: Re: [ISOGEOCHEM] O2 quality
>  
> Hi Neil
> 5.0 is fine (assuming that is what is inside).
> There might be a leak in the O2 plumbing.
> Turn off or unplug the autosampler to remove that as a possible cause of the N2 peak. Then run a bunch of blanks and see if the peak gets smaller.
> Don't bother starting a run just set masslynx to a time scan and N2 tuning and drop a blank every 30 secs or so.
> There is a small leak in the plumbing of one of my systems. Since we use it near exclusively for OH I never found the time to fix it so as a workaround fitted a 3 way valve to the O2 line and just purge it for a few seconds before running CN.
> Of course the N2 could be you need to clean or replace the sealing rings in the autosampler if the above doesn't fix things.
> Cheers
>  
> Nick..
>  
> Nick Collins
> President
> 
> Elemental MS
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> From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of NEIL OGLE
> Sent: Friday, September 20, 2013 10:05 AM
> To: [log in to unmask]
> Subject: [ISOGEOCHEM] O2 quality
>  
> Hi all
>  
> Quick confirmation required.  Is BOC's N5.0 oxygen of sufficient quality for C and N analysis on a Eurovector/ISOPRIME combo.  Ive been having probs for quite some time with my nitrogen results.  On a stable and linear machine (the latter somewhat overcome with same weight test standards) with new reaction/reduction chemicals, decent carbon numbers and a combination of O2 vol and pressure settings not improving the situation Im at the point of believing either O2 quality or a leak on the O2 line, the "blip" of a N2 response on a empty tin cup would suggest the latter, but can I find it....
>  
> Thanks
>  
> Neil
>  
>  
> Dr Neil Ogle
> Stable Isotope Facility
> School of Planning, Architecture and Civil Engineering
> QueenS University Belfast
> David Keir Building
> Stranmillis Road
> Belfast
> BT9 5AG
> Northern Ireland
> 
>