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PICList Thread
'UV Dangers'
1997\01\15@183408 by TONY NIXON 54964

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I posted a note earlier about a UV eraser setup of mine which is
crude but works ok for me. I should have thought about a beginner
doing this sort of thing and would just like to make mention that
these UV lights are dangerous. They can damage your eyes very easily
even though they just seem to emit a pale blue color. It is the UV light that
you cannot see that is dangerous.

I would suggest to anyone making a UV eraser to ensure that the
enclosure is light proof and that access to unwary people is denied.

Tony


Just when I thought I knew it all,
I learned that I didn't.

1997\01\17@115133 by Martin McCormick

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       Very good point.  My eraser is a small fluorescent fixture with a
tube which is about 12 inches long and 1/2 inch in diameter.  When I built
the wooden box for the fixture, I bought a fluorescent tube of exactly the
same characteristics as the  UV tube to use for testing purposes.  It looks
like the kind of tube one sees in a desk reading lamp or on the back cannel
of a cook stove or under a cabinet above a counter.  It lets one safely
test the lamp to make sure it is starting properly and also made it possible
to make sure the box didn't leak light anywhere when it was closed.  When
it is time to erase Eproms or PIC's, the fluoro tube comes out and the UV
tube goes in.  You can hear the starter ping a couple of times when it starts
and smell ozone from the ionisation of the air by the tube when the process
is over and you open the box.

       I put the timer from a dead microwave oven in series with the lamp,
but there isn't even a time scale behind the knob.  I know that if the knob
pointer is a little past one of the screws, this gives 10 to 12 minutes
of operation.  I mainly have the timer to keep from forgetting and leaving
an Eprom in the box for a week with the light on.  I hate to think what
that would do to it, but I bet it wouldn't be much good after that.  I also
don't know how long those UV tubes last so I decided to be conservative.

Martin McCormick

In message <spam_OUT1ABC0D96213TakeThisOuTspameng2.eng.monash.edu.au>, TONY NIXON 54964 writes:
>these UV lights are dangerous. They can damage your eyes very easily
>even though they just seem to emit a pale blue color. It is the UV light that
>you cannot see that is dangerous.

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