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PIR presence sensors deliver 40% energy savings in schools

PIR presence sensors deliver 40% energy savings in schools

PIR presence sensors deliver 40% energy savings in schools

The use of sensitive presence sensors delivers optimum lighting conditions as well as massive energy savings – over 40% compared with conventional light controls in German classrooms.

Because they are so sensitive and allow for zoned control, presence detectors, unlike the first-generation, more-basic PIR detectors, they are far more sensitive to light levels and movement and so allow for precise control.

Theben HTS presence detectors were chosen for the newly-renovated areas of the Schule fur Haushalt und Lebensgestaltung (SHL) in Aachen, Germany (pictured), where the client required lighting for nine classrooms, two preparation rooms, administration areas and corridors. This range is now available in the UK form sister company Timeguard Ltd. (

The model chosen provides two separately controlled switched outputs making it ideal for use in large spaces like classrooms. There are two sets of lights in each SHL classroom, and those nearest the windows switch off before those in the inner parts of the rooms where there is less natural light.

These presence detectors have inputs for conventional 230V sensors or switches for manual control. At SHL a semi-automatic operating mode was chosen so that lighting always has to be switched on manually but will switch off automatically if there is sufficient natural light or at night.

The sensors are barely visible – all that is seen are the pyramid lenses and the discreet Theben-HTS Quick Fix frame.

Further information is available at or call Timeguard Limited on 020 8452 1112.

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