Generic LJ12A3-4-J/DZ / R12-4A2 Inductive Proximity Sensor NC, 4mm Detection, DC 6–36V, IP65, 1.2m Cable

The sensor operates on a wide DC voltage range of 6 to 36 volts. This flexibility allows it to be integrated into various control systems, from 12V/24V industrial PLCs to standard 5V logic circuits with an appropriate voltage regulator. It features reverse polarity protection for safe wiring.

This shielded inductive sensor is primarily designed to detect ferrous metals, such as iron and steel. The sensing principle relies on the magnetic properties of the target, so non-ferrous metals like aluminum or copper will either not be detected or will have a significantly reduced effective sensing distance.

Yes, due to its shielded design, this LJ12A3-4-J/DZ sensor can be mounted flush with or embedded within a metal mounting surface without any reduction in its nominal 4mm sensing distance. This is a key advantage for clean industrial installations where the sensing face must be protected.

The 'Normally Open (NO)' designation means the sensor's output switch is open (non-conducting) when no target is present within the 4mm range. When a ferrous metal target enters the detection zone, the switch closes, completing the circuit. This is a standard configuration for triggering a PLC input or relay.

The integrated 1.2-meter cable provides a practical length for many machine and panel installations, reducing the need for immediate extensions. For longer runs, the cable can be spliced or connected to a junction box, ensuring the connections are properly insulated and protected according to the IP65 rating.