The Fuji Electric PXF4APC2-0VVA1 is a 1/16 DIN (48 x 48mm) compact temperature and process controller with self-tuning and a 50ms sampling speed. The self-tuning algorithm sets PID gains on first power-up, so you can swap this in without a laptop or a tuning run.
Deployment context
The 1/16 DIN (48 x 48mm) panel cutout is the standard for small-footprint controllers. It fits the same hole as older Fuji PXG or PXZ series, so retrofitting an existing panel usually means just pulling the old unit and sliding this in. No DIN-rail adapter needed — it's a panel-mount with a gasket for the front bezel.