Industrial CS-21N-3M Magnetic Proximity Sensor

Adsens CS-21N-3M is a three-wire, solid-state magnetic proximity sensor designed for round-type and tie-rod cylinders. It provides a normally open NPN current sinking output and operates from 5–30 V DC, switching up to 200 mA, making it suitable for simple position sensing in automated lines. The -3M designation indicates a 3-meter cable length, with a Ø4, 3-conductor PVC jacket that supports convenient mounting and wiring in constrained spaces. There is no indicator LED on the CS-21N variant, aligning with its compact, low-profile design. As part of the CS-21 family, it uses magnetic sensing rather than mechanical contacts, enabling reliable detection when a magnet approaches the sensor. The 3-meter length helps accommodate installations where the sensor must be positioned away from the controller, while the 5–30 V DC supply and 200 mA switching ceiling define the electrical envelope for interfacing with standard PLC inputs or relay modules. The CS-21N line is specifically intended for cylindrical actuator assemblies, delivering durable, contactless position sensing in industrial environments without relying on reed switches.