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Hello Wolfram

Yes, we did, it is fine, no short circuit.


Best regards
Getachew A. Adnew
-----------------------------------------------------------------------------------
Getachew A. Adnew
PhD student
email: [log in to unmask]
Institute for Marine and Atmospheric Research Utrecht (IMAU)
Princetonplein 5
Utrecht University
3584CC Utrecht, The Netherlands
Phone: (+31)-30-2531555

On Wed, Jul 25, 2018 at 3:38 PM, Wolfram Meier-Augenstein (pals) <
[log in to unmask]> wrote:

> Have you checked for short circuits between all source pins (connectors)
> once the source was installed using a multi-meter set to continuity testing
> (audible signal)?
>
>
>
> Sometimes everything checks fine while the source is still outside but the
> moment it gets installed and the springs get compressed wires inside the
> source that previously were free may now touch each other.
>
>
>
> *From:* Stable Isotope Geochemistry [mailto:[log in to unmask]] *On
> Behalf Of *Getachew Agmuas
> *Sent:* 25 July 2018 14:24
>
> *To:* [log in to unmask]
> *Subject:* Re: [ISOGEOCHEM] Fwd: Signal Loss on Delta Plus XL
>
>
>
> Hello Wolfram
>
>
>
> The problem is no signal at all. Thanks, it is a nice tip how to put back
> the ion source after changing the filament.
>
>
>
>
> Best regards
>
> Getachew A. Adnew
>
> ------------------------------------------------------------
> -----------------------
>
> Getachew A. Adnew
>
> PhD student
> email: [log in to unmask]
> Institute for Marine and Atmospheric Research Utrecht (IMAU)
> Princetonplein 5
> <https://maps.google.com/?q=Princetonplein+5+%0D%0AUtrecht&entry=gmail&source=g>
> Utrecht University
> 3584CC Utrecht, The Netherlands
>
> Phone: (+31)-30-2531555
>
>
>
> On Wed, Jul 25, 2018 at 2:59 PM, Wolfram Meier-Augenstein (pals) <
> [log in to unmask]> wrote:
>
>
>
> If the problem is a lower signal than before / expected, sometimes a tiny
> “misalignment” of the source flange can drastically reduce material gas
> flow into the source and thus result in significant reduction in signal
> while all checks return a clean bill of health.
>
>
>
> The holes in the source flange and the source housing have to be perfectly
> aligned. A partial eclipse will result an “almond”  shaped hole.  Despite
> the guide pin (gun sight) and the matching cut-out there is enough wiggle
> room for this to happen.
>
>
>
> Once the source is inserted twist (turn) the flange clock-wise as far as
> it will go, mark this position with felt pen. Now turn counter-clock-wise
> as far as it will and mark this position.  Turn back clock-wise until
> midpoint between these two marks.
>
>
>
>
>
> And now for a word from Capt’n Obvious.  Always check all pins on the
> source with a multi-meter for any shorts once the source has been inserted
> and all bolts tightened (but before switching on). ;-)
>
>
>
>
>
> *From:* Stable Isotope Geochemistry [mailto:[log in to unmask]] *On
> Behalf Of *C. Julie Luyt
> *Sent:* 25 July 2018 12:40
> *To:* [log in to unmask]
> *Subject:* Re: [ISOGEOCHEM] Fwd: Signal Loss on Delta Plus XL
>
>
>
> Seems this is a common problem!
>
>
>
> We have had a problem with low sensitivity on our Delta XP PLUS since our
> last filament (cathode) change.  As an example, we used to get a voltage on
> the CO2 reference gas of about 1300mV but now we only get 800mV.  As its
> affecting both gas bench and Dual inlet, it has to be a problem with an
> area that is common to both.   It affecting all of the gases:  CO2, O, H.
>
>
>
> We have considered the following:
>
>       1.       Faulty filament - changed to another but no improvement
> (Bjoern suggested an incorrect part, but we checked part number)
>
>       2.       Source - we have removed source, cleaned it and found a
> cracked ceramic spacer, replaced ceramic-  resulted in a small improvement
> , but not back to original sensitivity.
>
>       3.       Problem with changeover valve  - took this apart, nothing
> obvious wrong with it.
>
>      4.    We thought maybe the focus was out - initially we had no signal
> but we manually focused the machine to find it again and also adjusted the
> magnets,  and then did an auto focus once we found the signal.
>
>
>
>       Nothing brought the sensitivity back to the level it was before.
>
>
>
> Has anyone had a similar problem and was able to correct it?
>
>
>
>
>
>
>
>
> On Jul 25, 2018, at 01:19 PM, Getachew Agmuas <[log in to unmask]>
> wrote:
>
> Dear all
>
>
>
> Our Delta Plus XL is still not working, we did not find any signal so far
> (we tried both for CO2 and O2). We looked the possible reasons so far, but
> still we did not solve it. Things we checked:-
>
> - we changed the broken  filament
>
> - we did amplifier test, works fine
>
> - The Magnet current control board works fine
>
> - The fuse for the high voltage board works fine
>
> - connection wires inside the Teflon block on the front of the source
>
>
>
> Finally, we changed the filament again even if it is not broken, but it
> does not help.
>
>
>
> Any suggestion and feedback is well come.
>
>
>
>
> Best regards
>
> Getachew A. Adnew
>
> ------------------------------------------------------------
> -----------------------
>
> Getachew A. Adnew
>
> PhD student
> email: [log in to unmask]
> Institute for Marine and Atmospheric Research Utrecht (IMAU)
> Princetonplein 5
> <https://maps.google.com/?q=Princetonplein+5+%0D%0AUtrecht&entry=gmail&source=g>
> Utrecht University
> 3584CC Utrecht, The Netherlands
>
> Phone: (+31)-30-2531555
>
>
>
> ---------- Forwarded message ----------
> From: *Getachew Agmuas* <[log in to unmask]>
> Date: Sat, Jul 21, 2018 at 3:11 PM
> Subject: Signal Loss on Delta Plus XL
> To: Stable Isotope Geochemistry <[log in to unmask]>
>
> Dear all
>
>
>
> After I changed a broken filament, I could not find signal signal any
> more. I opened the ion source and  checked the filament looks fine. I tried
> to play with the focusing but there is no luck. Does any body have any idea
> or suggestion what to do?
>
>
>
> Best regards
>
> Getachew A. Adnew
>
> ------------------------------------------------------------
> -----------------------
>
> Getachew A. Adnew
>
> PhD student
> email: [log in to unmask]
> Institute for Marine and Atmospheric Research Utrecht (IMAU)
> Princetonplein 5
> <https://maps.google.com/?q=Princetonplein+5+%0D%0AUtrecht&entry=gmail&source=g>
> Utrecht University
> 3584CC Utrecht, The Netherlands
>
> Phone: (+31)-30-2531555
>
>
>
>
>
>
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