How Operating Conditions Influence PI Heater Design Choices

https://flexible-heat-systems.summitquill.com/posts/what-to-consider-when-ordering-a-kapton-heater-for-industrial-use

In sensors, a pi heater must deliver heat in a controlled way. It uses a thin resistive foil circuit laminated in polyimide film. One useful trait is fast response. Still, local hot spots can change the result