Unlike using the ED-XRF, there are quite a few areas to be taken care of, in
case you will be using a spark emission portable spectrometer like the
ARCMET. Argon gas of 99.999% min purity is to be used. The gas flow also has
to be controlled as per the instrument requirements, as even setting an
improper flow rate can lead to improper purging, eventually leading to a
deviation in the test results.
Also, the surface to be checked has to be polished using a 60 grit paper (
as this surface finish is used when the equipment is calibrated). This
polished surface should the be checked as soon as possible to avoid any
contamination.
Nowadays, when we use the new models like the ARCMET 8000, we can test flat
as well as round surfaces, as there are adapters available for the same.
Normally, even 1 inch O/D pipes can also be checked using this equipment
with concordant results as per our experience. Of course, for flat surfaces,
there is no problem at all.
Generally, this is a slower process as compared to the XRF, but it yields
quite excellent, accurate and repeatable results.
Regards,
N. Kalyan.
ELCA Laboratories, Thane and Pune.
----- Original Message -----
From: "Raghuram Bathula" <raghurambathula@gmail.com>
To: "Materials & Welding" <materials-welding@googlegroups.com>
Sent: Monday, March 24, 2008 9:39 PM
Subject: [MW:691] Re: 688] Re: PMI TESTING OF SS 304L
>
> you can try ultrahigh pure from the following range, research purity
> may not be avaialble offthe shelf
> RESEARCH PURITY 99.9999%
> ULTRA HIGH PURE 99.999%
> PRE-PURIFIED 99.998%
> ZERO GAS 99.998%
> HIGH PURITY 99.995%
> also surface cleaning of the conatcat area importatnt, consult your
> analyser supplier for further help!
>
> On Mar 24, 3:35 pm, shailesh dave <snd2...@yahoo.com> wrote:
> DEAR Mr. RAGHURAM,
>
> BUT SPARK EMISSION WHAT WE ARE ADOPTING HERE IS ARGON BASED AND MANY
> TIMES I FOUND PURITY OF ARGON IS NOT ENSURED. HENCE I AM RELUCANT TO
> GO FOR SPARK EMISSION FOR PMI OF LOW CARBON SS.
>
> YOUR VIEWS PLEASE.
>
> REGARDS,
>
> S.N.DAVE
>
>
> >
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