Generic LJ30A3-15-J/DZ / R30-15A2 Inductive Proximity Sensor AC NC, 15mm Detection, 90–250VAC, 400mA

This specific model features a Normally Closed (NC) output. In its resting state (no target present), the output circuit is closed and conducts current. When a metal target enters the 15mm sensing range, the output switches to an open state, interrupting the current flow. This is the inverse of a Normally Open (NO) sensor and is often used for safety-critical 'stop' or 'alarm' circuits.

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 this 15mm nominal range sensor, the actual detection distance for aluminum will be approximately 30-50% shorter. Always refer to the sensor's reduction factor specifications for precise non-ferrous metal sensing distances.

Connect the brown wire to the live AC line (90-250VAC), the blue wire to the neutral line, and the black wire is the switched NC output load wire. The sensor output (black wire) is in series with your load (e.g., relay coil, contactor, PLC input). Ensure the load current does not exceed the 400mA maximum rating. The metal body must be properly grounded via the mounting hardware or a dedicated ground wire.

A non-shielded sensor can be installed flush with (or recessed into) a metal mounting surface without a loss of its nominal sensing distance. This is because its sensing field extends radially from the front face. Shielded sensors have a metal ring around the sensing face and require a clearance zone around them; they cannot be flush-mounted without significantly reducing their effective range.