Generic LJ8A3-2-Z/AX Inductive Proximity Sensor, NPN NC, 2mm Range, DC 6-36V, IP65

The NPN Normally Closed (NC) output provides a closed circuit (conductive path to ground) when no target is present, opening the circuit upon detection. This is often used for fail-safe applications where a broken wire or power loss triggers an alarm. In contrast, a Normally Open (NO) output is open at rest and closes upon detection.

Yes, inductive proximity sensors can detect all conductive metals, but the effective sensing distance is reduced for non-ferrous metals compared to ferrous metals like steel. For precise application, refer to the sensor's technical datasheet for reduction factors, typically around 30-50% of the nominal 2mm range for aluminum.

Connect the brown wire to your positive DC supply (6-36V), the blue wire to the DC common (0V), and the black wire (the switched NPN output) to your PLC's digital input. The PLC input must be configured as a sinking input, as the NPN transistor sinks current to ground when active. Ensure the sensor and PLC share a common ground.

The setting distance is the optimal installation gap between the sensor face and the target to ensure reliable switching and account for mechanical tolerances, thermal expansion, and target surface variations. Installing the sensor within 0-1.6mm of the target (80% of the nominal 2mm range) guarantees stable operation and avoids false triggers from edge effects.