How is the outdoor UV getting to the sensor?

I would be willing to bet that the outdoor UV is basically a
DC component on the UV sensor and it might be eliminated
with a simple filter in the system either analog or digital
implemented in one of the 8pin processors.

Regards,


Walter..
--
Walter Banks
Byte Craft Limited
http://www.bytecraft.com



Dwayne Reid wrote:

> Good day to all.
>
> Its a long shot, but I thought that I'd ask here.
>
> A company I work with has developed a new flame effect system that is
> now in use.  Its actually really cool, but that's not really relevant
> here.  Later, maybe.
>
> Anyway, the flame is ignited with a spark gap fed from a standard
> spark ignition transformer such as those used in natural gas
> appliances.  The spark is monitored with a commercial flame control
> system that uses a UV sensitive sensor.
>
> The problem is with the UV flame sensor.  Its actually quite
> sensitive and can get false-triggered even when there is no spark if
> the system is being used outdoors.  That's causing us some grief.
>
> What I want to do is change to using a system that monitors the spark
> directly.  That is: it would monitor for spark current in the ground
> electrode.  If spark is present, fuel flow is enabled.
>
> This system uses continuous spark - the spark is operating anytime
> flame is being called for.  That makes spark proving a viable option
> for safety.
>
> The problem is that I can't find any spark proving systems that don't
> rely on a UV sensor.  That might be because I'm using the wrong
> search term ("spark proving" or "spark proving system") or it might
> be because I'm looking in the wrong places.
>
> I'm hoping that someone here might be able to offer search or product
> suggestions.
>
> If worst comes to worst, I can build something.  I've actually got a
> design in mind - it looks to fail-safe under all conditions and will
> pass the multiple-failed-components test.  The problem is the cost of
> getting it approved.
>
> If it turns out that someone doesn't make a spark proving system, I
> guess that's the way I'll go: build it and get it approved.  I should
> be able to sell more of these in the future if no one currently makes
> these units.
>
> Many thanks!
>
> dwayne
>
> --
> Dwayne Reid   <dwayner@planet.eon.net>
> Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> (780) 489-3199 voice          (780) 487-6397 fax
> www.trinity-electronics.com
> Custom Electronics Design and Manufacturing
>
> --
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> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

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