Presence detector Siemens KNX 5WG1258 with integrated brightness sensor

The Siemens KNX presence detector 5WG1258 with integrated brightness sensor is a wall-mounted device for KNX building automation that combines passive infrared motion detection with ambient light measurement. It monitors occupancy and daylight levels to enable automatic control of lighting and energy-saving functions. Designed for professional installations, this presence detector is suitable for offices, corridors and meeting rooms where reliable presence detection and light-dependent control are required.

Advantages

The device integrates motion detection and a brightness sensor in a single unit, reducing the need for separate components and simplifying wiring. Its compatibility with KNX systems allows flexible configuration and scene integration within building automation networks. The presence detector provides stable detection performance across typical indoor environments and supports energy-efficient lighting control based on measured ambient light and occupancy.

Suitable for

• Office spaces and open-plan work areas
• Corridors and circulation zones in commercial buildings
• Meeting rooms and conference areas
• Areas requiring light-dependent switching and presence-based control

Key specifications

• Detection method: passive infrared (PIR) motion detection
• Integrated brightness sensor for ambient light measurement
• Designed for KNX building automation systems
• Wall-mounted installation

How to use

Install the presence detector at the recommended height and position to ensure optimal coverage of the monitored area. Connect the device to the KNX bus and configure detection parameters, time delays and brightness thresholds using a KNX programming tool. Use the device within the KNX project to trigger lighting scenes, switch circuits or adjust dimming levels based on presence and ambient light measurements.

Usage recommendations

Position the detector to avoid direct exposure to large windows or heat sources that can affect detection or light measurement. Calibrate brightness thresholds to local daylight conditions and test detection zones after installation to ensure reliable operation. For optimal energy savings, combine presence-based control with timed scenes and daylight harvesting strategies within the KNX system.