In libraries or similar premises it can be very hard to detect presence using IR detectors because of small movements and screening interior fittings.

Light sources

The fittings can use conventional 50 Hz operating devices or non-dimmable HF operating devices.

Control system

In this type of premises IR detection using Special Lens 51 from the lens library is used. It provides the maximum possible resolution and the capacity to detect small movements. Lighting is switched when presence is detected by an IR detector, which should be placed so that it detects entrance into the premises.

Detection is considerably simplified by the AD-350 acoustic detector, which listens within a higher frequency range and registers the sound of people’s steps, ‘S’ sounds, rustling paper etc.

The AD-350 thus complements the IR detector in environments where sedentary people must be detected and in areas where detectors cannot detect presence because of the interior fittings in this case bookcases.

The AD-350 thus complements the IR detector in this example from a library.

Upon each influence by the acoustic or IR detector, the time the lighting is switched on is extended by the delay period set in the relevant detector. Both detectors are connected to an auxiliary relay against load or contactor, to avoid 230 VAC entering the detectors.

Information for current budget