It's not the filament!
Try taking a look at the gas config and/or calibration settings. Can you create a fast jump going from CO2 to N2? This jump isn't useful for anything except troubleshooting of course. If trying to create the jump results in an error (jumpcalibrationdll.dll), then the problem is with the N2 configuration to be resolved in the gas config editor.
----- Original Message -----
From: William Mark <[log in to unmask]>
Date: Friday, January 25, 2008 10:49 am
Subject: [ISOGEOCHEM] Halted Runs - Not always a good thing.
To: [log in to unmask]
> Hello All
> I have been experiencing and intermittent "event" for a couple of
> months now that is
> getting worse and needs to be resolved - hopefully someone can toss
> me a clue
> before running to the default , filament replacement.
> This "event" has been seen over a couple of different filaments
> installed over a 3
> month period; when itīs running, the sensitivity, stability and
> sample analysis have
> been very good. I have tried re-tuning several times with very
> little change in tune
> settings or the problem. I do daily Mass Jump testing etc...
> Lately, with the increased frequency of this "event" the spec has
> had more stability
> issues and notable HV peak centre shifting during Mass Jump testing.
> In a nut-shell;
> We have a Delta Plus running solid C/N EA samples. At some point
> during the run
> (sample 8, or 53 or 111 - anytime) after analysis the CO2 Ref pulse
> and jumping
> back to Nitrogen for the next analysis, I get a "Fatal Script
> Error". This is a drag not
> only for lost analysis time but it leaves the Ref Valve open all
> night.It seems, once the jump back to nitrogen is complete, the Ref
> gas is opened and
> before it can run the peak centre, the run is halted. I have
> noticed at this time, that
> not only is the spec blind to the N2 Ref Gas peak but even the
> background levels
> drop to unfamiliar readings, as though it is no longer even looking
> in the proper
> After sitting for a few seconds, to a few minutes, "blip" the
> proper backgrounds come
> up (or the Ref Gas peak, if it is still open).
> I am ready to pull the filament out and try another but I was
> wondering if anyone
> thinks it could be some other "flakey" electronics/ board. It seems
> not to be landing
> where says (or thinks) it is, after the jump to back to nitrogen.
> Any thoughts would be greatly appreciated.
> Have a good weekend.
> I am off to a cottage with my 2 younger brothers (leaving our
> families behind), to
> drink beer, watch movies and play Guitar Hero. It may not help but
> it canīt hurt.
> Bill Mark
> Isotope Technician
> Environmental Isotope Lab
> University of Waterloo
> Phone (519)-888-4567 Ext 36747
> FAX (519)-746-7484