long time wrote:
>
> wouldn't a thermometer in the reservoir validate the functionality of
> the heat exchanger? also the laser should shut down on an over temp
> prior to any damage? and what serious damage will it cause? is the
> detailed literature too long to post on the m/l?
> Al Sims
>
> >From owner-rp-ml@ltk.hut.fi Mon Mar 08 14:20:40 1999
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> >Message-ID: <36E4557A.34D2@earthlink.net>
> >Date: Mon, 08 Mar 1999 14:55:54 -0800
> >From: ERIC KING <lzrdude@earthlink.net>
> >Reply-To: lzrdude@earthlink.net
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> >To: rp-ml@bart.lpt.fi
> >Subject: SLA-500, heat exchangers
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> >
> >Dear list,
> >
> >Please check your heat exchanger.
> >
> >It has come to our attention that there are several problems
> >concerning the Laser Pure heat exchangers on the SLA-500 machines:
> >
> >1) The Coherent "Laser Pure 20" heat exchangers out in the field,
> > are not the correct model, and may cause severe damage to your
> > laser. They were not intended to be used with this model laser,
> > and we can supply detailed literature upon your request.
> >
> >2) We have also seen "Laser Pure 40" models with the wrong
> > internal components. Which also may cause laser problems.
> >
> > To check for the correct component, remove the top lid,
> > and remove the side panel from the LP-40 unit.
> > (the side that has all the water fittings)
> > Locate the stainless steel heat transfer unit.
> > The unit should have the model # CB26-90H,
> > if it does not, please contact us.
> >
> >We have only seen these problems, on systems with dates prior to
> >1992.
> >
> >If you have questions, or need more info, please contact us:
> >
> >Laser Innovations
> >(805) 529-5864 tel
> > 6621 fax
> >sla-500@laserinnovations.com
> >
> >Best regards,
> >
> >Eric King
> >
> >For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
>
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Dear Mr. "long-time" Sims
Yes, a thermometer will till you that the heat exchanger is doing
it's job, at that point in time, but the LP-20 is rated at ~19
Kilowatts.
The laser is feeding ~16K in, which leaves very little room for
fluctuations
in the secondary cooling loop, of the plant water.
Yes, the laser "should" shut down. But, we all know how reliable
electronics are.
I have repaired quite a few laser systems, that have had a run in
with poor "fail-safe" devices.
As for serious damage, the plasma tube could crack - and become an
expensive aquarium for your gold fish, the magnet will be fried, and
I would also check the passbank for any bad transistors.
Yes, the literature (AKA owners manual) would be too much to post.
I have plenty of copies, for those who need them. As well as laser
manuals, for the Coherent laser systems.
Of the 4 water filled laser tubes we have seen in the past year, 3 were
running on LP-20's , and 1 was on an LP-40.
Un-expected down time, for the RP industry, is very painful. I was just
trying to let everyone know what we have seen. The LP-20's should have
been replaced years ago by 3D; when the lasers were upgraded from the
325's,
326's to the now high current 328 laser systems.
Best regards
Eric
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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