Mounting Configuration of Occupancy Sensors

Determining the mounting configuration and location for a Occupancy Sensor is a critical design decision. The mounting configuration ,in particular ,affects the available coverage area. Improper mounting location is a leading cause of application problems with occupancy sensors.

Mounting can be done at the following locations:

  • Ceiling
  • High Wall and corner
  • Wall switch( Wall box)
  • Workstation  
Ceiling
Appropriate for large areas that feature obstacles such as partitions,in addition to narrow spaces such as corridors and warehouse aisles. Units can be networked for control of areas that are larger than what can be controlled be a single sensor. Typically 2-2 times higher installed cost than wall switch sensors but can be economical if controlling large zones.


High Wall and Corner
Similarly appropriate for coverage of large areas that feature obstacles.

Wall Switch (Wall Box)
Appropriate for smaller enclosed spaces such as private offices with clear line of sight between sensor and task area. Relatively inexpensive and easy to install. For maximum savings,select sensors that provide positive disconnect from the power when the lights are off to avoid residual power use during off state.

Workstation
Appropriate for individual cubicles and workstations.


SELECT MOUNTING CONFIGURATION 

Mounting             Sensor               Angle Of                      Typical                        Optimum  
Location              Technology       Coverage                      Effective Range       Mounting Ht

Ceiling                      US                     360                              500-2000 sq.ft               8-12 ft
Ceiling                      PIR                    360                              300-1000 sq.ft               8-30+ ft
Ceiling                      DT                     360                              300-2000 sq.ft               8-12 ft
Wall Switch              US                     180                              275-300 sq.ft                 40-48 in.
Wall Switch              PIR                    170-180                        300-1000 sq.ft               8-15 ft
Corner Wide view      PIR/DT              110-120                      to 40 ft                           8-15 ft
Corner narrow view PIR                     12                               to 130 ft                         8-15 ft
Corridor                   US                      360                              to 100 ft                         8-14 ft
High Mount             PIR                     12-120                        to 100 ft                          to 30 ft
High Mount corner  DT                      110-120                      500-1000 ft                    8-12 ft
High Mount Ceiling DT                      360                             500-1000 ft                    8-12 ft        
  
US= Ultrasonic Sensor   PIR= Passive Infrared Sensor  DT= Dual Technology Sensor

images courtesy Schneider Electric

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