On 01-Sep-10 14:54, Dwayne Reid wrote:
> 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
>

     A bimetal thermostat or a furnace flame sensor maybe.

     Mark





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