autotune

[lsummer]

i just clean the source on my 5973 gc/ms and the autotune the morning after shows emvolts at 2600 and the air/water check has the N2 at 43.57% any suggestions on getting those parameters under 2400 emvolts and under 20%N2?

[carlo.annaratone]

I would say that there is a leak somwhere in your system!

[kubowicz.tomasz]

Hello

You have massive leak...check connection between GC and MS

Tomasz Kubowicz

[lsummer]

checked that and it seems the column is stuck in the GC/MSD interface, the column is not budging

[carras]

Hi

I'd like to remind you that there's a thread about blocked GC/MS transfer lines in the forum. Good luck

[lsummer]

well it took some effort but we got the column out...now the tune shows the emvolts higher at 2894 and N2 is 51% O2 16% Co2 2% H2O 12% N2/H2O 418%

[kubowicz.tomasz]

Hello

You still have huge leak. Check GC:
-inlet (do leak test)
-check your carrier gas trap ! (it could be saturated)

You can make simple test to narrow problem down:
-plug transfer line with blank nut and bake out MSD for couple of hours. Than perform autotune.

Regards

Tomasz Kubowicz

[Steve Reimer]

Start by loading an older tune file before you run autotune, if you have saved any of the recent ones. Otherwise it may take a long time for the routine to converge on usable values.

[James_Ball]

Hello

You still have huge leak. Check GC:
-inlet (do leak test)
-check your carrier gas trap ! (it could be saturated)

You can make simple test to narrow problem down:
-plug transfer line with blank nut and bake out MSD for couple of hours. Than perform autotune.

Regards

Tomasz Kubowicz

Definitely try this, it will tell you if you have a leak in the GC or the MS. You could have lint or some other object on the O-Ring that seals the analyzer side plate or even a broken interface if you find that the leak is still there when you use a solid ferrule and nut on the interface.