Please could you explain how the max repeller voltage set in the tune affects the tune? Does a higher max. value mean the tune can use up to that voltage to tune or will it use that max value as default? Will a difference in a max repeller value in the tune file affect the analysis? I have some thoughts of my own on this but would like to know…(Show moreShow less)
Hi all, I need to switch column every 2 weeks on a GC (7890B) / MS (5977A). The first time I did it, I had a leak in the system and I had to vent it again to fix it (o-ring of the vent valve). This took time because the heating zones are at 280, 280, 150ºC for transfer line, Source and Quad respectively. I don't have Ar or polyfluoroethane…(Show moreShow less)
I am, honestly, not sure. I suppose zones are heated to prevent condensation of compounds. At 100ºC and at low pressure, water should be in the gas fase like O2/N2. Anyway, I had to try it. I had a leak, of course, and waiting for hot zones to cool down was not an option. With the MSD's hot zones always at 100ºC, I vented the system until…
Hello everyone, we have an Intuvo 9000 with a 5977 MSD coupled. After a colleague changed the septum our etune showed a leak in Air/Water Check. No Problem I thought, I purged the liner, made a succesful leak check and waited for the next day. The Air and Water check wasn't better. I've checked every connection with a leak detector,…(Show moreShow less)
I do not see peak area in LCMS 6420, instead I see response. Also, response is very low, I mean responses are in the range of 4000-5000, when I see in millions from other reported methods. Can someone help finding correct peak area in LCMS 6420?.
You original post has 2 questions. You can add a column called 'Area' to the batch table by right mouse clicking on the table and selecting 'Add/Remove Columns...'. You will see that Response and Area are the same number. For the second part where you are expecting responses in the millions of counts - which analytes are you measuring? Are you…
I inherited an Agilent 7890 with 5975C MSD using Chemstation. I am still trying to figure out what I am doing. The instrument was performing okay about a week ago. Yesterday I tried to do a run and I had high baseline and no peaks. Autotune showed very high water and N2, O2 so I suspected the side door might have a leak (this happened once…(Show moreShow less)
We have utlilized Agilent/HP MSD's for over 35 years at Eastman Chemical Company. They are very reliable and cost effective tools for compound identification in complex mixtures. We have >40 GC-MSD's located worldwide to characterize unknowns. NIST user librarys are automatically updated and shared over the corporate network nightly (>50,000 EI…(Show moreShow less)
Hi! We recently vented our system in order to change the column. However, now the system does not turn on the TOF vac. Rough pump and quad. are at normal levels, all turbopumps at 100% speed. But TOF just says "Off". We've tried to powercycle the instrument and rebooted the computer to no help. Any ideas? Thanks!
Our 7200B GC-QTOF shutdown overnight the other day. When we came back to the lab, it showed the following faults: 5.31 Main board #1 shutdown 7.5 Filament drive timeout 7.30 Main board #2 internal shutdown 7.31 Main board #2 shutdown After power-cycling it refuses to enter ready mode saying that the high voltage controller is not…(Show moreShow less)