The reason for asking is that the model mentioned in the paper is the PI 160.
This camera’s standard version has a temperature range from -20°C up to 900°C. It can be “optionally” expanded to 1500°C … for significantly higher cost. … but do we know for sure that the Lugano camera was the “expanded version” ? I can find no mention that it was the expanded version, and this is the kind of detail which should be noted. This is not a trivial question - when errors are exponentially multiplied by a fourth power. From: Jones Beene BTW – does anyone know the model # of the Optris camera used in Lugano ? From: Bob Higgins The original plan was to buy an Optris camera and sell it after MFMP's experiments were completed. Bob Greenyer even tried to buy THE camera used for the Lugano experiment.

