In any case, the sensor will automatically extinguish the lights a predetermined time after the last motion is detected. Wallbox occupant sensors are low cost upgrades to standard switching. They integrate well with other control strategies and are suitable in most office and institutional buildings with existing manual switching systems. Ceiling Occupant Sensors Ceiling occupant sensors include a detector module mounted on the ceiling or wall, along with a transformer relay mounted onto a junction box above the ceiling or in some other remote location. In the manual on mode users much turn on the lights manually.
Lights are extinguished after a predetermined pause following cessation of occupancy in the space.
Several sensors can be connected to the same transformer relay, providing coverage of larger rooms or complex room configurations. Both ceiling and wallbox occupant sensors are suitable for office, commercial and some industrial buildings with a reasonable correlation between wiring and lighting control zones. Existing manual switch wiring may result in easier installation, particularly with wallbox devices. Installation of occupant sensors may require additional rewiring in older, economically wired, and uncontrolled buildings. Devices usually require calibration and attention to mounting details and product selection for optimum performance.