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- Posts: 21
- Joined: Tue Aug 19, 2014 12:53 pm
- Location: Florida USA
I am working on a 6890/5973 system. It has been giving me trouble lately. I have exhausted my admittedly minimal knowledge and am hoping I can get some assistance from the more experienced folks on this forum.
Yesterday, I ran an auto-tune because I do this daily right now due to issues with the MS popping up frequently. All looked good, water was a bit high at 10% but I did open the analyzer chamber recently to re-seat and lightly Apiezon grease the door o-ring (was leaky). Nitrogen, oxygen, and carbon dioxide were all under 3%.
This morning when I came in and ran the auto-tune again, I have terrible nitrogen, 73%. I think no problem, must need to re-tighten my transfer line and inlet connections. I do this and get about a quarter turn out of each. I then run an air-water check and it's a mess - I still have an obvious air leak.
I go into manual tune and monitor as I test with difluoroethane duster. I do not get any spikes. I cannot find this leak and I am especially confused because yesterday the machine was fine, I did not change anything, today I come in and it's leaking air. Did I over-tighten my connections this morning? Do I need to break vacuum and check my ferrules, make sure I didn't split them? I am using 60/40 vespel/graphite ferrules, standard size on the transfer line and the short ones on the inlet side. I don't have a large budget to buy anything special. Does anyone have any suggestions?
Thank you very much for your time and your help.
Erika