Generic LJ30A3-15-Z/DX Inductive Proximity Sensor, 2-Wire DC NC, 15mm Detection, Brass-Nickel Housing, IP65

The LJ30A3-15-Z/DX features a Normally Closed (NC) output. In its resting state (no target present), the output circuit is closed, allowing current to flow. When a metal target enters the 15mm detection range, the output switch opens, interrupting the current. This is the opposite behavior of a Normally Open (NO) sensor and is often used in fail-safe circuits where an open circuit indicates a detected target or a fault condition.

The sensor's solid-state output can switch a maximum load current of 200mA. This is sufficient to directly drive many PLC input modules, control relays, or indicator lamps. Always ensure your connected load does not exceed this current rating and that the total power dissipation is within limits for the sensor's 6-36VDC operating voltage.

Wiring is straightforward: connect the brown wire to the positive DC supply voltage (6-36VDC) and the blue wire to the negative/ground side of your load (e.g., a PLC input or relay coil). The load is placed in series with the sensor. The sensor acts as a switch, completing the circuit to ground when active (for NC type, it's closed at rest). The built-in reverse connection protection helps prevent damage from incorrect polarity.

Yes, inductive proximity sensors detect all conductive metals, but the effective sensing distance varies with material type. The rated 15mm detection distance is typically specified for mild steel (Fe360). For non-ferrous metals like aluminum, brass, or copper, the actual sensing distance will be reduced, often by 30-60%. It is recommended to test with the specific target material and adjust the mounting distance accordingly.

A 'non-shielded' (or flush-mountable) sensor allows the sensing face to be mounted flush with a metal surface without affecting its operation. However, it requires a clearance zone around the sides of the sensor barrel to prevent interference from the surrounding metal mounting bracket. Always refer to the sensor's datasheet for the required side and front clearance distances to ensure proper detection performance.