Motion Sensor Installation


Consider with following factors when selecting and installing motion sensors:

Factor

Consideration

Room/space size and shape Ceiling/mounting height
  • Compare motion sensor range to ceiling height (if mounted on the ceiling)
  • Consider motion sensor coverage area based on mounting height
Location of walls, doors, windows and drapes
  • HF motion sensors may detect motion through windows, doors, drapes and drywall
  • Consider potential mounting positions based on walls, doors, windows and drapes
  • Compare motion sensor range to room size (if mounted on the wall)

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Objects in room/space

Location of shelves, book cases, file cabinets, large equipment or other large objects
  • PIR motion sensors need ‘line of sight’, so any obstruction may prevent the motion sensor from detecting movement
Location of partition/desk/workspace
  • Consider orientation with regards to walls, partitions and other obstacles
  • PIR motion sensors need ‘line of sight’, so any obstruction may prevent the motion sensor from detecting movement
  • HF motion sensors can see through drywall, cubicle partitioning and glass

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Occupants 

Location/s of occupant activity and non-activity

  • PIR motion sensors need ‘line of sight’, so ensure that motion sensors are mounted with good visibility of areas of occupant activity

Type of movements occupants make – large (such as walking) vs small (such as typing)

  • PIR motion sensors are better at sensing small motion at close range, so ensure appropriate mounting distance from areas of movement

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Mounting location/s 

Location/s available for motion sensor mounting

  • HF motion sensors can be mounted inside ceiling panels, wooden or plastic boxes and cabinets
  • PIR motion sensors require ‘line of sight’ to detect motion, so cannot be mounted inside or behind anything

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Environment factors affecting motion sensors

Location of climate control devices
 and airflow

  • PIR motion sensors rely on changes in temperature to detect motion, so mounting motion sensors near draughts, or cooling or heating devices/vents can create false readings
High levels of vibration
  • HF motion sensors detect motion through changes in vibration, so use in areas with high levels of vibration can create false readings

  • If a motion sensor is mounted on an object that vibrates or has movement (like a lamp post or pole) it can create false readings
Extreme temperature conditions
  • PIR motion sensors rely on changes in temperature to detect motion, so use in areas of extreme temperature will decrease their effectiveness. Specialised low temperature PIR sensors should be used.
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    Device(s) load


    Cumulative load of all devices to be added per single motion sensor

    • The total load (Watt) of all devices to be added to each motion sensor must be compared to the motion sensor’s maximum load specification
    • Take the power factor of the connected device in consideration when determining the load
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    Also see:
    Motion Sensor Technology and Selection
    Motion Sensor Settings
    Motion Sensor Best Practices