In an earlier contribution to this discussion,
RzB wrote:

Many thanks to all for the responses.

One other point - The Distance:Spot ratio. Do I take it that's
the size of the area being measured vs. distance from surface?
So if it's 8:1 then if you are 8 metres away from the surface
it's measuring a 1 metre diameter area.

Many thanks,
Roy


Yes. Imagine a narrow cone with its apex at the sensor and its base on the
surface whose temperature is being measured.
--
Cheers,
Roger
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