StanBon STD20-16NC Light Curtain Sensor 16 Beams 20mm Pitch 300mm Height - 12-24V DC

The beam pitch is the center-to-center distance between adjacent infrared beams, which is 20mm for the STD20-16NC. This specification determines the minimum size of an object that can be detected. A 20mm pitch ensures that objects like fingers or small tools will reliably interrupt at least one beam, triggering the safety stop signal as required by safety standards for fine-resolution protection.

The sensor typically provides Output Signal Switching Device (OSSD) outputs, which are safety-rated transistor outputs (often PNP or NPN). You must connect these outputs to a validated safety relay or safety controller (PLC) to form a complete Category 4 safety circuit. The 12-24V DC power is connected to the designated terminals, and the OSSD outputs are wired to the safety controller's input module to monitor the beam status.

While built with industrial durability, standard light curtains like the STD20-16NC typically carry an IP54 rating, making them resistant to dust and water splashes from any direction. They are suitable for most indoor industrial environments. For outdoor use, exposure to direct rain, extreme temperatures, or heavy condensation would require a housing with a higher IP rating (e.g., IP65/IP67) or a protective overhang.

The detection height is the total vertical coverage of the active beam array, which is 300mm for this model. With 16 beams at a 20mm pitch, the effective detection zone starts from the first beam's position. The height is calculated as (Number of Beams - 1) * Beam Pitch, which for 16 beams at 20mm equals 300mm, providing a continuous protected zone over that span.