Sven

This is interesting. I replaced the SGE needle valve a few months back 
on our Delta V. SGE have modified the needle valve and it uses PEEK 
ferrules whose ID must be around 0.4 to 0.5mm. So basically we need to 
changed back to GVF ferrules with the larger ID, correct?

John Hill
UCL

Sven Steinbrenner wrote:
> Dear Istvan,
> there is a modification at the needle valve seat ferrule.
> Thermo use a ferrule with a bigger core inside (0,8 mm).
> You can order it with the pn 1221460 GVF-ferrule for Needle valve id 0.8mm.
> 
> I replaced at our 3 Deltas all seat ferrules and was wondering about the 
> bad performance.
> Lower signal height;  bad Ref gas peaks (round at the beginning).
> After a few mails to the support, we get the info about this modification.
> 
> I hope this helps.
> 
> Best wishes
> Sven
> 
> Fórizs István schrieb:
>> Dear Ulrich and others who helped us with advises,
>>
>> after all we have made the first measurements during the night. Now it 
>> worked acceptable, although the peak height has not encreased (it is 
>> about half than was before). But now the H3 factor is far better. 
>> After the cleaning of the ion source the H3 factor varied between 16 
>> and 24!!
>> Yesterday it was between 6.3 and 6.4, and looked stable. Today it was 
>> 6.15 and 6.05 (we have measured it two times), and looks stable.
>>
>> What we have found are:
>>
>> 1) One plate in the ion source was 90 degrees off. It is the closest 
>> one to the ionization box, no. 02, and without wire connection (there 
>> is a metal ring between this plate and the ionization box). When we 
>> put it to the proper position we expected a significant encrease in 
>> the peak height, but it did not happen. We do not understand why.
>>
>> 2) The connections of the high voltage cable (red) on the outer part 
>> of the ion source were (and are) loose. Practically after may 
>> disassembling and reassembling one of these connections was 
>> disconnected. When we discovered it, we realized that all these 
>> connections are loose a priori. So we have to be very careful when 
>> cleaning the source.
>>
>> What we have not checked is the needle valve on the input port of the 
>> MS. We have noticed that now it is more difficult (needs more force) 
>> to close and open it then before. May be that it causes the half 
>> height peak?
>> What is your experience with the needle valve?
>>
>> Thank you very much for the help provided by many of you!
>>
>> Best wishes
>> Istvan
>>