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 email@example.com Mon Mar 08 14:20:40 1999
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> >Date: Mon, 08 Mar 1999 14:55:54 -0800
> >From: ERIC KING <email@example.com>
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> >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
> >If you have questions, or need more info, please contact us:
> >Laser Innovations
> >(805) 529-5864 tel
> > 6621 fax
> >Best regards,
> >Eric King
> >For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
> Get Your Private, Free Email at http://www.hotmail.com
> For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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
The laser is feeding ~16K in, which leaves very little room for
in the secondary cooling loop, of the plant water.
Yes, the laser "should" shut down. But, we all know how reliable
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
326's to the now high current 328 laser systems.
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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