LJ4A3-1-Z/AY Inductive Proximity Sensor PNP NC, 1mm Detection, 10–30VDC, IP65, Shielded

A PNP Normally Closed (NC) output supplies +V (sourcing) to the load when no target is detected, and switches OFF (open circuit) when a target enters the sensing field. This is the inverse of a Normally Open (NO) output. NC configuration is often used for fail-safe logic, where a wire break or power loss causes the signal to go inactive, triggering an alarm. Ensure your PLC input module is configured for a PNP (sourcing) signal.

This shielded inductive proximity sensor is specifically designed to detect magnetic (ferrous) metals such as iron and steel. Non-ferrous metals like aluminum, copper, or brass will not be reliably detected, or will have a significantly reduced sensing distance. The 1mm nominal range is calibrated for standard mild steel.

Connect the brown wire to your positive DC supply voltage (10-30VDC), the blue wire to the DC common (0V), and the black wire to your load (e.g., a PLC digital input). The load's other side connects to the DC common. The sensor includes reverse polarity protection, but incorrect wiring will prevent operation. Always refer to the sensor's datasheet for the exact wire color coding.

A 'Shielded' (flush-mountable) sensor has its sensing field concentrated at the front face. It can be mounted flush in metal without causing false triggers from the surrounding material. However, its effective sensing range is slightly shorter than an 'Unshielded' (non-flush) version. Ensure the target approaches the sensor axially for reliable detection.

Yes, with its IP65 rating, the sensor is protected against dust ingress and low-pressure water jets from any direction. It is suitable for washdown areas and environments with oil mist or coolants. However, it is not submersible or suitable for high-pressure, direct water immersion. Ensure the cable gland or connection is properly sealed.