Hager has added a new light-sensitive occupancy sensor to its Klik OS range that it says provides significant energy savings for simple on/off lighting control solutions and can help designers comply with Part L of the Building Regulations.
The new sensor can detect presence or, for greater savings, just absence. In presence detection mode the sensor combines switching in response to movement with light levels. When the ambient light levels drop below a preset level the sensor will switch the lights on. If it then detects no movement after a preset period it will switch the lights off. The time delay to switch off can be set between five and 35 minutes.
If the absence detection-only mode is selected, the sensor will detect movement but will not switch on the lights when people enter the area. Occupants need to switch the lighting on using a wall or other retractive switch. Once the lights are turned on, the sensor will turn them off if no movement is detected for a preset time.
For artificial light management, the device has two options. In passive light management mode, the sensor will stop the lights switching on if the lux levels are above a set point, but then it will not switch them off during occupancy. Active management has the same functionality but will also switch off the lights if the photocell detects that there is enough natural light to achieve the desired lux levels.