[alt-photo] Re: Metal halide lamps in plate burners and ozone???

[Greg Mikol]

Mark (and everyone else)--

Having just recieved the wiring schematic from NuArc/M&R Print for my 
new (to me) NL22-8C, I can at least comment on the operation of that 
unit (which also slows the fan during exposure).

The slowing of the fan is intentional (though I'm not sure why). I 
expect slowing the fan down allows the bulb to reach operating 
temperature more quickly. When exposure is started, a relay switches the 
fan (a 120V fan) from a 120V tap on the power transformer to a 37V tap 
on that transformer. When exposure ends, it's switched back to the 120V 
tap (you can hear the fan speed up) to allow the bulb to cool between 
exposures.

Hope that helps.

--Greg


 > On Apr 16, 2010, ender100 wrote:
 >
> may just be that the entire unit is drawing more power and affecting 
> fan speed.
> --
> Best Wishes,
> 
> Mark Nelson
> Precision Digital Negatives
> PDNPrint Forum @ Yahoo Groups
> 
> Mark Nelson Photography
> 
> 
> On Apr 16, 2010, at 8:37:48 AM, "Loris Medici" 
> <mail at loris.medici.name> wrote:
> 
>  From:  "Loris Medici" <mail at loris.medici.name>
> Subject:    [alt-photo] Re: Metal halide lamps in plate burners and 
> ozone???
> Date:   April 16, 2010 8:37:48 AM CDT
> To: "'The alternative photographic processes mailing list'" 
> <alt-photo-process-list at lists.altphotolist.org>
> Dear Bob,
> 
> I noticed that the plateburner slows down the speed of the exhaust fan 
> on
> the top during exposure -> do you think that's because of ozone 
> generation?
> I don't know how ozone smells and I don't notice any additional smell 
> in the
> room during or right after exposure. Go figure! Can you describe the 
> smell
> of ozone? (If that's possible...)
> 
> Thanks,
> Loris.