On 13/03/2020 20:49, Harry Bloomfield wrote:
Chris Hogg explained on 13/03/2020 :
Looks like a spark ignition electrode, but if you're sure it's the
ignition detector, then within a flame there's some ionisation

I thought ionisation detection was a more recent method than as long ago
as 30 years? The common method back then was the thermocouple method of
flame detection.

No - my 30-year-old Baxi Solo boiler uses flame ionisation to detect
when the pilot is lit, and then operate a relay to turn on the main burner.
--
Cheers,
Roger
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