Slot sensor for small-part detection
The Omron EE-SPX303 is a fixed-slot photomicrosensor — the emitter and receiver are aligned inside a 13 mm polycarbonate fork. It detects an opaque object as small as 2.2 × 0.5 mm passing through the slot, with a differential distance of 0.05 mm max, meaning it catches small parts like pins, tabs, or labels on a high-speed line without external mounting brackets. The infrared LED (940 nm peak) pulses at a response frequency of 100 Hz min, so the sensor can register parts moving past at up to 100 per second — enough for most pick-and-place or conveyor gates.
NPN output and wiring constraints
Output is NPN open-collector, rated 80 mA max load current with a residual voltage of 2.0 V max at that load. The supply is 12 to 24 VDC ±10% with ripple under 5%, drawing 15 mA max. The special connector means soldering is not possible — you need the mating connector housing, so verify the cable assembly before wiring. Both power supply and output have reverse polarity protection — a common failure point in field wiring. The IP50 rating means it's protected against dust ingress but not washdown; keep it inside a dry cabinet or guarded enclosure.