The Fuji Electric PXF4APA2-FVVA1 is a self-tuning 1/16 DIN (48 x 48mm) compact temperature and process controller with a 50ms sampling speed.
The 1/16 DIN (48 x 48mm) cutout is the standard panel-mount footprint for temperature controllers — it drops into the same hole as any other 1/16 DIN unit, so no panel rework is needed when swapping brands or series. The 50ms sampling speed is fast enough for most thermal loops; if you are controlling a high-speed infrared heater or a thin-film process, that speed keeps overshoot under control.