Pro-Range RM18 8mm Inductive Proximity Sensor - PNP NO, Unshielded, M18 Thread, 6-36V DC

Unshielded (non-flush) sensors, like this RM18 model, allow the sensing electromagnetic field to extend from the face and sides of the barrel. This permits detection of metal objects approaching from the side and allows the sensor to be mounted flush with or even protruding from a metal mounting surface without affecting its sensing field or range.

Inductive proximity sensors are primarily designed to detect ferrous metals like steel and iron. The standard 8mm detection distance is specified for mild steel. Detection distances for non-ferrous metals like aluminum, copper, or brass will be significantly reduced, typically by 30-60%, due to lower conductivity and permeability.

Connect the brown wire to the positive DC supply voltage (6-36V), the blue wire to the DC common (0V), and the black wire is the PNP output. In the NO configuration, the black wire will switch to supply voltage (sourcing current) when a metal target is within range. The load (e.g., a PLC input, relay coil) connects between the black output wire and the DC common (blue wire).

The setting distance (0-5.6mm) is a safe operating margin, typically 70% of the standard detection distance (8mm). It is the recommended maximum installation distance for a guaranteed, stable switch operation, accounting for manufacturing tolerances, temperature effects, and supply voltage variations to prevent unreliable triggering.