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Thu, 18 Jan 2007 16:38:59 +0000 |
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Hello Penny
I am glad you got your vacuum problem sorted out, its always best to
use a torque wrench on those aluminium rings as they will tend to
seal better and can be re-used.
On the Penning problem and if its an Edwards Active Gauge, it may be
better to buy a spares kit when the existing one gets contaminated.
The part number is D145-45-802 Spares Kit AIM Gauge and cost in the
UK around 110 GB PDS.
However please check the model number first as it may differ. When
you install a new Penning head they always seem to read a higher
pressure than before which then drops over a period of time.
In the source these crimp connectors can be a nuisance and I have
sometimes replaced them with barrel connectors.
You need to make sure that the wires are properly crimped for each connection.
Is the HT coming on? If it isn't, then it maybe the Penning head that
is causing source problem. We had this fault on our MAT-253.
Regards
John
At 14:37 18/01/2007, you wrote:
>Hi all,
>
>I got my system pumping down and happy once I figured out that I
>just had the turbo pump seated wrong. Now I've got new problems -
>which I've localized and just am seeking some advice.
>
>When I finally turned on the source again, I got no emission.
>
>I thought maybe I had a wire loose (the filament was only a few
>weeks old when the turbo died), I pulled out the source again and,
>lo, many loose connections. I put them all back together,
>re-inserted the source, and tried again. Still no emission. No Trap
>voltage; no Box voltage.
>
>Thinking it might be the penning gauge (especially since I wasn't
>getting as good a vacuum reading as I normally get), I took the
>gauge off to clean. Yup - it's a mess in there.
>
>Question: Do I clean the parts of the penning gauge the same way I
>clean the parts of the source?
>
>For grins, I pulled out the source again and to my dismay found that
>some wires were loose again. Most notably the lead to the box was
>off. The connections in our source seem to no longer hold in place
>very well, and spring off very readily.
>
>Question: Any thoughts on how to get them to stay on better? Can I
>just crimp them a bit?
>
>Thanks, all!
>
>~Penny
>
>
>
>*******************************************************************
> Dr. Pennilyn Higgins
> Research Associate
>
> "SIREAL"
> Stable Isotope Ratios in the Environment Analytical Laboratory
>
> Department of Earth and Environmental Sciences
> University of Rochester
> 227 Hutchison Hall
> Rochester, NY 14627
>
> [log in to unmask]
>
>Office: 209b Hutchison Hall Lab: 209 Hutchison Hall
>Voice : (585) 275-0601 Outer lab: (585) 273-1405
>FAX : (585) 244-5689 Inner lab: (585) 273-1397
>
> http://www.earth.rochester.edu/SIREAL/index.html
>*******************************************************************
>
John Hill
Mass Spectrometry Facility
University College London
Chemistry Department
20 Gordon St.
London
WC1H 0AJ
Tel: 020 7679 4605
Fax: 020 7679 7451
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