The Fuji Electric PXF4AES2-MBKA1 is a self-tuning 1/16 DIN (48 x 48mm) compact temperature and process controller with a 50ms sampling speed. The self-tuning algorithm sets PID parameters automatically on first run, so commissioning a zone doesn't require manual gain scheduling.
The 1/16 DIN (48 x 48mm) cutout is the standard panel-mount footprint for temperature controllers — fits the same hole as every other 1/16 DIN unit on the market, so a panel cut for an older controller accepts this one without rework. Depth is typical for the class; no special clearance needed behind the panel for wiring.