Sensor Switch CMRB 9 Series Standard Range occupancy sensor mounts directly to the end of a luminaire and utilizes the industrys leading Passive Infrared (PIR) technology to provide amazing sensitivity to small motions and excellent payback. The sensor is line powered and can switch loads directly without the need for a power pack. A CMRB 9 is typically installed on each fixture when used inlong corridors with concrete ceilings and pendant or surface fixtures spaced 10-20 (3.05-6.10 m) apart. This approach maximizes energy savings and may be more cost effective than running low-voltage wiring. When mounting above 15 (4.57 m) the CMRB 6 Series is abetter option than the CMRB 9; and when mounting below 8 (2.44 m) or for greater radial coverage the CMRB-10 Series should be alternatively considered. Additionally, for areas with obstructions, the CMRB PDT 9 is recommended.