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ISOGEOCHEM  July 2012

ISOGEOCHEM July 2012

Subject:

Re: HT control problem - Delta Advantage

From:

"Harlow, Benjamin" <[log in to unmask]>

Reply-To:

Stable Isotope Geochemistry <[log in to unmask]>

Date:

Tue, 17 Jul 2012 18:10:31 +0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (271 lines)

If you have access to a mini air brush/media blaster it can work great to clean the feed throughs.
The one I used was fitted with a hypodermic tip which allows for pinpoint cleaning of all surfaces without damage to the solder or flange.

http://www.micromark.com/PAASCHE-AIR-ERASER-MINI-SANDBLAST-GUN-SET,9117.html?sc=WGB&utm_source=GoogleBase&utm_medium=feed&utm_campaign=GoogleBase
 
Benjamin Harlow
Manager, Stable Isotope Core Laboratory
Washington State University
School of Biological Sciences
367 Eastlick
Pullman, WA  99164-4236
 
Office:  509-335-6161
Lab:     509-335-6154
Fax:     509-335-3184
 
Laboratory for Biotechnology and Bioanalysis (LBB2) Stable Isotope Core
http://www.isotopes.wsu.edu
 
 

-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Wolfram Meier-Augenstein
Sent: Tuesday, July 17, 2012 2:12 AM
To: [log in to unmask]
Subject: Re: [ISOGEOCHEM] HT control problem - Delta Advantage

So as not to jam inboxes, Rob and I had a chat off-list.

However, since it would seem we have managed to identify the reason for his source behaving badly, I thought we should share this with the list.


Wolfram


-----Original Message-----
From: Robert Van Hale [mailto:[log in to unmask]]
Sent: 17 July 2012 10:02
To: Wolfram Meier-Augenstein
Subject: RE: [ISOGEOCHEM] HT control problem - Delta Advantage

Oh my god, that's got to be exactly it. After the last source clean I connected up the heater bulbs incorrectly so that one was seeing 24 V. It burned out fairly promptly and I dismantled to replace it to find big black marks on the source support legs. I put it down to a dud bulb. I replaced without noticing the incorrect connection and the next one exploded audibly inside the source! So, had to open up again, take the turbo off and hold upside down while vacuuming the turbo screen for shards of glass. At least I diagnosed the bad connection that time! But there could still be metal varnish all over the place. Still, I'm sure it's the white piano keys they're supposed to look like, not the black ones:) All the best Robert

> -----Original Message-----
> From: Wolfram Meier-Augenstein [mailto:Wolfram.Meier- 
> [log in to unmask]]
> Sent: Tuesday, 17 July 2012 8:45 p.m.
> To: Robert Van Hale
> Subject: RE: [ISOGEOCHEM] HT control problem - Delta Advantage
> 
> 
> 
> Hi Rob,
> 
> 
> I was wondering if you could get the HT up  beyond 1kV.
> The last (and only time) I've seen similar odd readings was when one 
> of our post-docs killed the source control board.
> 
> I am not discounting the idea of arching inside the source (across 
> ceramics contaminated with vapourised metal) but the reason for this 
> problem should be a thing of the past.
> 
> Making ceramics sufficiently conducting to result in arching happened 
> when Thermo were inadvertently using a poor batch of heater bulbs.  
> Over time The legs of the halogen bulbs started to discharge material, which "condensed"
> on to the source ceramics.  Easy enough to spot when taking out the 
> source because otherwise ebony coloured ceramics look like they're covered with soot.
> 
> 
> Best wishes,
> 
> Wolfram
> 
> ****************************
> Professor W Meier-Augenstein, PhD, CChem, FRSC
> 
> E-mail: [log in to unmask]
> JHI: http://www.hutton.ac.uk/
> MIS: http://www.isotopesignatures.co.uk
> 
> 
> -----Original Message-----
> From: Robert Van Hale [mailto:[log in to unmask]]
> Sent: 17 July 2012 09:15
> To: Wolfram Meier-Augenstein
> Subject: RE: [ISOGEOCHEM] HT control problem - Delta Advantage
> 
> Hi Wolfram,
> This is electrician's slang that I assumed had made it into common 
> usage, well at least common to mass spec laboratory types. Megger: (v) 
> to test with a megohmmeter - in my case using a 1kV signal to probe 
> the resistance.
> A word no electrical apprentice will ever forget as one of the joys of 
> having a new apprentice was always to hand him a clip lead and say 
> "hold this" while giving the crank handle a wind to energise him 
> momentarily to several hundred volts.
> Cheers
> Robert
> 
> > -----Original Message-----
> > From: Wolfram Meier-Augenstein [mailto:Wolfram.Meier- 
> > [log in to unmask]]
> > Sent: Tuesday, 17 July 2012 7:13 p.m.
> > To: Robert Van Hale
> > Subject: RE: [ISOGEOCHEM] HT control problem - Delta Advantage
> >
> >
> > Hi Rob,
> >
> >
> > What do you mean by saying "Source meggers to 1kV"?
> >
> >
> > Best,
> >
> > Wolfram
> >
> >
> > ****************************
> > Professor W Meier-Augenstein, PhD, CChem, FRSC
> >
> > E-mail: [log in to unmask]
> > JHI: http://www.hutton.ac.uk/
> > MIS: http://www.isotopesignatures.co.uk
> >
> >
> > -----Original Message-----
> > From: Stable Isotope Geochemistry [mailto:[log in to unmask]] 
> > On Behalf Of Robert Van Hale
> > Sent: 17 July 2012 06:00
> > To: [log in to unmask]
> > Subject: Re: [ISOGEOCHEM] HT control problem - Delta Advantage
> >
> > Thanks very much Bethany,
> > I am still leaning towards a real electronic fault today, but I 
> > might follow your advice as being the lesser evil than sending the 
> > source board away or calling up service for diagnosis.
> > Did you see the HV readback on screen varying too?
> > The difference in our situations that makes me not suspect metal 
> > striping of the ceramics is that it has been several months since 
> > our source was cleaned and we've had good running all that time.
> > All the best
> > Robert
> >
> >
> > > -----Original Message-----
> > > From: Stable Isotope Geochemistry [mailto:[log in to unmask]] 
> > > On Behalf Of Bethany P Theiling
> > > Sent: Tuesday, 17 July 2012 12:54 p.m.
> > > To: [log in to unmask]
> > > Subject: Re: [ISOGEOCHEM] HT control problem - Delta Advantage
> > >
> > > Hi Robert,
> > >   We experienced these same problems a few months ago.  We had 
> > > recently cleaned only the metal source parts because the ceramics
> appeared ok.
> > We
> > > pulled the source and cleaned again, including cleaning the 
> > > ceramics
> > with
> > > HF, then rinsing several times with ultrapure water and baking the 
> > > ceramics at several hundred degrees.  This seemed to solve the
> problem.
> > > Good luck,
> > > Bethany
> > >
> > > --
> > > Bethany Theiling
> > > Stable Isotope Specialist
> > > Purdue Stable Isotope Facility
> > > Purdue University
> > > [log in to unmask]
> > > 765-494-3274
> > >
> > >
> > > ----- Original Message -----
> > > From: "Robert Van Hale" <[log in to unmask]>
> > > To: [log in to unmask]
> > > Sent: Monday, July 16, 2012 6:39:44 PM
> > > Subject: [ISOGEOCHEM] HT control problem  - Delta Advantage
> > >
> > >
> > >
> > >
> > > Dear Isogeochemists
> > >
> > > Would anyone recognize these symptoms for a Delta Advantage/XP -
> > >
> > > HT readback in Isodat showing +/- 200 volt variations,
> > >
> > > Peak shape terrible - just camel humps instead of nice flats,
> > >
> > > Relative voltages of the three beams changed ie CO2 signal should 
> > > show increasing voltages in the order 44 45 46, but this order 
> > > reversed or mixed up,
> > >
> > > Not neccesarily showing noise,
> > >
> > > All of these symptoms intermittent. It really doesn't look like a
> > problem
> > > filament although I will probably change it later today. Source 
> > > meggers
> > to
> > > 1kV.
> > >
> > >
> > >
> > > Any notes or ideas would be most appreciated
> > >
> > > thanks
> > >
> > > Robert Van Hale
> > >
> > > Department of Chemistry
> > >
> > > University of Otago
> > >
> > > Union Place West
> > >
> > > P.O. Box 56
> > >
> > > Dunedin 9054
> > >
> > > New Zealand
> > >
> > > P: +64 3 4797915
> > >
> > > C: +64 027 4141266
> > >
> > > F: +64 3 4797906
> > ________________________________________________________
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> > you should not read, copy, disclose or rely on any information 
> > contained in this email, and we would ask you to contact the sender 
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> This email is from The James Hutton Institute (JHI), however the views 
> expressed by the sender are not necessarily the views of JHI and its 
> subsidiaries. This email and any attachments are confidential and are 
> intended solely for the use of the recipient(s) to whom they are 
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> The James Hutton Institute is a Scottish charitable company limited by 
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> Registered in Edinburgh No. SC374831
> Registered Office: The James Hutton Institute, Invergowrie Dundee DD2 5DA.
> Charity No. SC041796

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