What the 50 ms sampling buys you
The PXF9ACR2-JBTA1 samples every 50 ms, which means it catches fast thermal transients — think injection-mold nozzle heaters or small-oven zones — that a 100 ms or 250 ms controller would alias into a lagged reading.
Panel fit and sourcing posture
The 1/4 DIN (96 x 96 mm) cutout is a standard panel footprint — fits the same hole as any other 1/4 DIN controller, so swapping a failed unit doesn't require re-punching the panel.