LJ24A3-10-Z/AY Inductive Proximity Sensor PNP NC, 10mm Detection, 6-36VDC, 300mA, Brass-Nickel Housing, IP65

This LJ24A3 model features a PNP (sourcing) output in a Normally Closed (NC) configuration. In its resting state (no target present), the output signal wire is internally connected to the positive supply voltage (+V). When a metal target is detected within the 10mm range, the output switches to a high-impedance (open) state. This is the opposite logic of a Normally Open (NO) sensor and is used for fail-safe applications where a broken wire or loss of power should trigger an alarm.

As a standard inductive proximity sensor, it detects both ferrous (iron, steel) and non-ferrous metals (aluminum, copper, brass). However, the effective sensing distance can vary significantly between materials. The nominal 10mm distance is typically specified for mild steel (Fe360). For non-ferrous metals like aluminum or copper, the sensing distance is reduced, often by 30-60%, due to lower permeability and conductivity. Always refer to the sensor's reduction factor for specific materials during system design.

Connect the sensor's brown wire to your DC positive supply (6-36VDC), and the blue wire to the DC common (0V). The black wire is the switched PNP output. For a sinking PLC input (common to +V), connect the black sensor output directly to the PLC input terminal. The PLC input's common should be connected to +V. When no target is present, the black wire will be at +V, supplying current to the PLC input, which will read as 'ON'. When a target is detected, the output opens, current stops, and the PLC input reads 'OFF'.

Yes, the IP65 rating indicates it is dust-tight and protected against low-pressure water jets from any direction. This makes it suitable for most industrial environments where exposure to coolants, oils, or occasional washdowns occurs. However, IP65 is not suitable for continuous immersion or high-pressure, high-temperature washdowns. Ensure the cable gland is properly secured and the sensing face is kept clean of thick debris or metallic swarf buildup for reliable operation.