Generic LJ5A3-1-Z/AY Inductive Proximity Sensor PNP NC, 1mm Detection, 10-30VDC, IP65, Brass-Nickel Housing

This LJ5A3 model features a PNP (sourcing) output. In a Normally Closed (NC) configuration, the output switch is closed (conducting) when no target is present and opens when a metal object is detected within the 1mm range. PNP outputs switch the positive voltage supply to the load, which is the typical convention for many PLC input modules in 24VDC systems.

Inductive proximity sensors are primarily designed to detect all conductive metals, including steel, aluminum, copper, and brass. The exact sensing distance can vary slightly depending on the target material's conductivity and magnetic permeability, with ferrous metals like steel typically providing the longest detection range.

The sensor has a 3-wire configuration: Brown wire connects to the positive DC supply (10-30VDC), Blue wire connects to the DC common/negative, and the Black wire is the PNP output signal. Connect the Black wire to your PLC input or load, and the other side of that load connects to the DC common. The built-in reverse connection protection helps prevent damage from incorrect polarity.

The setting distance (often called the operating distance) is the recommended range for reliable switching. For this 1mm nominal sensor, you should install the target metal object to pass within 0 to 0.7mm of the sensing face. This ensures a reliable signal margin and accounts for mechanical tolerances, temperature drift, and supply voltage variations.