What it is and where it fits
The PXF4APS2-0BSA1 is a self-tuning 1/16 DIN (48 x 48mm) compact temperature and process controller with a 50ms sampling speed. That 50ms sampling rate means it catches fast thermal transients in processes like injection molding or packaging seal bars where a standard 100ms controller would lag. The 1/16 DIN form factor fits a standard panel cutout, so it swaps into existing temperature control panels without enlarging the hole.