Balluff BOS26K-PA-1LHB-S4-C Laser Proximity Sensor

Balluff BOS26K-PA-1LHB-S4-C is a compact diffuse laser proximity sensor from Balluff's BOS 26K family that detects objects within a 30–150 mm range using triangulation and background suppression. The red laser light provides a small, highly localized beam spot (about 0.1 mm at the focal point) with the focus typically around 80 mm, enabling reliable sensing of small targets while minimizing interference from ambient light. The sensor measures 17 × 50 × 50 mm and uses an ABS housing with a PMMA sensing surface, designed for panel mounting and wired through a 4-pin M12 connector to deliver a PNP transistor output (normally open or normally closed, depending on variant) at 10–30 V DC. As a block-style diffuse sensor, it relies on diffuse reflection from the target rather than a separate reflective surface, making it well-suited to general presence detection on conveyors, packaging machines, and other automation equipment where space is at a premium. The BOS 26K family emphasizes background suppression to reduce false triggers from nearby objects or background clutter, helping maintain stable operation in busy industrial environments. This model variant is typically used where a compact, laser-based diffuse sensor with reliable PNP switching is required to monitor part presence, verify gaps, or trigger downstream machinery in automated lines.