Dave Liquorice wrote:
On 9 Sep 2005 16:22:26 -0700, nazn wrote:

I am having major probs with the sensor sensing the exhaust fumes
every time the boiler is used.

Mask of the parts of the lens that look in the direction of the flue?
Bits of insulating tape on the inside should do it.

Insulating tape may be transparent in the IR - comes from the pigment
being well under the wavelength of the IR.
Metal backed tape will totally obscure it.

However, simply pointing the PIR away may work.