The Fuji Electric PXF4AEY2-MBKA1 is a self-tuning 1/16 DIN (48 x 48mm) compact temperature and process controller with a 50ms sampling speed. That sampling rate matters for processes with fast thermal response — think injection molding nozzle zones or small-flow heat exchangers where a standard 100ms or 250ms loop would overshoot. The self-tuning algorithm sets PID gains on first run, so you skip manual tuning on startup.
Panel fit
The 1/16 DIN cutout (45 x 45mm panel hole) is the standard footprint for this class. It clips into the panel from the front; the depth behind the panel is shallow enough for most enclosures with a 100mm minimum internal depth. The 50ms sampling speed is fast enough to catch thermal transients in a 48mm-wide package — you get the loop speed of a larger 1/8 DIN unit in a space-saving format.