Hi David,
Just a couple of ideas.
If the Micromass users group is still alive, I would post to that. Just a sneaky thought but I know that the engineers look at that site and sometimes they answer on their own without going through the factory.
Another person to try is Nick Collins, he is now based in the USA but he likes to air his knowledge and he used to be a micromess engineer. He has posted on Isogeochem in the past so you should be able to get his email address from that.
kim
-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of David Wheeler
Sent: Wednesday, 31 October 2007 9:10 AM
To: [log in to unmask]
Subject: Re: Multiflow problem
Issam,
I have not used the multiflow but it looks similar to the multiprep I
have. If the mode of operation is the same then the vial is pumped down
to vacuum and then the acid is delivered. I have had problems when acid
is sucked into the vials during the pumping phase. The carbonates react
immediately and the CO2 is lost into the vacuum line. This can be due
to the acid not being viscious enough (ie <100% H3PO4) but it is more
likely due to an air leak on the acid line. To test load a sample into
a vial, insert the needle, raise the needle so the vial is lifted out of
the block and you can see it, then pump it down while watching. It is
pretty obvious if there is a problem.
You can get the same effect even in the absence of a leak if an air
bubble has been drawn into the acid line (eg by operating the pump with
the acid inlet out of the acid). The air will expand as vacuum is
applied. To cure this simply operate the pump, preferably with the
needle under vacuum, until the bubble is pumped through.
cheers,
David
Issam Moussa wrote:
>Dear all,
>We have a problem on our multiflow carbonates
>Bitter to introduce samples or references carbonates in vials, after
>automatic injection of the acid, after a calibration in 70蚓 during 2 heurs
>At the time of the analysis, there is no more CO2 in vials
>The CO2 escapes in the stage of preparation at the time of the injection of
>the acid
>When I injectele CO2 in vials manually and I waits for 2 heurs I discover
>the CO2
>So there is no problem of leaks on vials
>If you have to meet this problem, I waits you for proposition and diagnose
>
>Issam
>
>
>
--
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David Wheeler
Professional Officer
Geochemistry Laboratory
School of Earth and Environmental Sciences
University of Wollongong,
Wollongong, 2522, NSW
Australia
Phone 02 4221 4586 (office)
02 4226 5903 (lab)
Fax 02 4221 4250
E-mail [log in to unmask]
'Oh no, we won't give in,
we'll go living in the past'
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