Abus bw8000 xevox eco motion detector abus bw8000 p the abus bw8000 xevox eco motion detector is a passive infrared motion sensor pir sensor that reacts to all types of heat movement and reports this to the alarm centre p p the best place to install the equipment is in a corner between 2 3m above the floor the potential motion direction should be at right angles to the sensor unsuitable for installation are all places opposite to sources of heat e g heating or a window do not