flame detector

I just typed "boiler flame detector" into google and got
about 261000 hits.  It's going to take me another few
minutes to read them all.  They should get you started.

Michael

I can't speak to water tube boilers specifically, a lot of spark ignition
systems use flame rectification to sense flame.

When a flame exists, there is ionization of the gas between the ignition rod
and the burner.  If you apply a positive voltage to the burner, there is a
current typically of a few uA from the ignition rod to the burner.  If the
physically much smaller ignition rod has a positive voltage on it, most of
the negative ions are drawn toward it but miss it (much like current flow
past the grid or screen in a vacuum tube).

Mark Walsh
Rogue Engineering Inc.
www.rogue-engr.com

On 3ÔC28ÈD5, ÏC2ÎE74ÊB139·D6, "smyagho...@gmail.com" <smya=
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