Omron Inductive Threaded Barrel Proximity Sensor, M30, 40 mm Detection, PNP NO, 10 → 30 V dc

Long-distance Detection Prevents Unexpected Facility Stoppages
The world's longest sensing distance
With high-brightness LED, the indicator is visible anywhere from 360°.
Only 10 Seconds to Replace a Proximity Sensor with the "e-jig" (Mounting Sleeve).
Cables with enhanced oil resistance enabled 2-year oil resistance
Comes in a wide variation to make sensor selection easy