Contrinex Proximity Sensors Inductive sensor 624552 - Contrinex 330-020-385, The Contrinex DW-AD-509-M18-390 is an inductive sensor featuring quasi-shielded technology for precise proximity detection. This robust proximity switch from Contrinex is designed for high-performance analogue sensing in industrial applications. Typical uses include automation processes where accurate metal object detection is critical. Contrinex 330-020-385 M18 Inductive Sensor Quasi-Shielded Analogue