It may be a heating up phenomenon; however, also in my experience, after opening the source, and especially after cleaning it, the
emission and/or HV kick off every few minutes to hours. This is probably due to arcing of absorbed solvents or water.
If you keep turning it back on and after the system is pumped down a couple to few days it becomes less frequent to doesn't happen anymore. It may take awhile to settle where enough of the contaminants are driven off.
Baking it awhile may speed up the process.
From: Stable Isotope Geochemistry [[log in to unmask]] On Behalf Of Marilyn Fogel [[log in to unmask]]
Sent: Monday, April 18, 2011 4:52 PM
To: [log in to unmask]
Subject: [ISOGEOCHEM] Further question
This is useful information that I'm getting..thanks for that. Our
source is still on the instrument, nice vacuum, no evidence of shorts
that can be measured externally.
Our symptom now is that when it was reassembled and checked for
sagging/wagging heater wires, the emission came on for about 10
minutes. I did a magnetic scan--looked ok. But the emission light went
off..I turned on again, thinking maybe something out-gassed. It lasted
another 10 min and off. This morning we examined the external leads--
no shorts, fuse on the emission regular fine. Again, it was on for 2
ten minute periods--now off again and not on at all. This sounds like
some electronic part is heating or charging up, then failing.
Has anyone experienced this?
On Apr 18, 2011, at 3:43 PM, Sauer, Peter wrote:
> Hello all:
> I have been bold enough to use silver wire and silver tubing, both
> obtained from the local artists' supply store, to replace the leads
> to the halogen light bulbs. The tubing is useful when I break off
> the tiny sockets that the light bulb leads are supposed to slide
> into. This first happened when I learned that not all the "G4" style
> lightbulbs have the same diameter for their leads! Some are too fat.
> From: Stable Isotope Geochemistry [[log in to unmask]] on
> behalf of Robert van Geldern [[log in to unmask]]
> Sent: Monday, April 18, 2011 3:36 PM
> To: [log in to unmask]
> Subject: Re: [ISOGEOCHEM] Instructions for Cleaning Delta Plus ion
> On 16.04.2011 18:17, Marilyn Fogel wrote:
>> Another question: We are having problems with the wires holding the
>> halogen bulbs in the source. The manual notes that they might be
>> "waggling". I think they are waggling. Any suggestions on how to deal
>> with this? With time (the instrument is about 13 years old), the
>> and bulbs are sagging (like me), shorting out the source.
> You may order a new "set" of wires either from Thermo or e.g. from
> Mascom (Bremen, Germany)
> "Set heater connection, #9000374F for +/XP"
> My tip:
> remove the bulbs (and the wires) if do not run SO2. It worked always
> fine without the bulbs for 2H, 18O and 13C on water and carbonates
> H2 and CO2.
> Dr. Robert van Geldern
> GeoZentrum Nordbayern / Applied Geosciences
> University of Erlangen-Nuremberg
> Schlossgarten 5
> 91054 Erlangen, Germany
> mailto:[log in to unmask]
> fon: +49(0)9131-85-24780 (office)
> fax: +49(0)9131-85-29294
> Room: O 0.106 (office)