What this controller is and what the 50ms sampling means
The Fuji Electric PXF4APR2-MVVA1 is a self-tuning 1/16 DIN (48 x 48mm) compact temperature and process controller with a 50ms sampling speed. The self-tuning algorithm maps the process response curve on startup, so you don't need to manually calculate P, I, and D gains for each zone.
The 48 x 48mm 1/16 DIN cutout is the standard panel-mount size for temperature controllers across the industry — it drops into the same hole as any other 1/16 DIN unit. Mounting depth and terminal layout are consistent with the PXF series; no panel rework needed if replacing an older Fuji or a competitive 1/16 DIN controller in the same cutout.