Where are Occupancy Sensors Required
03th September 2021

Electronic devices that detect the presence of people are occupancy sensors. There are many technologies for occupancy sensing, including microwave, infrared, ultrasonic, and video or image processing. These sensors typically connect to a building's IoT network and send back data to the building management that enables automated lighting, ventilation, and HVAC control. In this article, we will understand, where are occupancy sensors required.  You will learn how to design a layout specifically for your application.

 

Placement of sensors in open offices

Large open office spaces are often divided into cubical walls that vary in height, as well as having air returns, ceiling fixtures, sprinklers, and similar devices, which all need to be considered. In an open space, it is not generally necessary to cover every inch of the space with occupancy sensors, just because people are likely to move freely throughout the space. Important Points To Consider While Installation:

 

  • Walkways should be covered.
  • In addition, ensure that the pattern coverage overlaps on walkways. The idea is to ensure that occupancy sensors are not triggered accidentally if people move in blind spots.
  •  Install ceiling-mounted detectors. If the walls of the cube are low, wall-mounted sensors might be a good choice.
  • Ensure that sensors are not mounted near air vents, since airflow and vibration can compromise sensor performance (Keep PIR sensors at least four feet away from air vents, and keep ultrasonic sensors at least six feet from air vents).

 

Placement of sensors in Private offices

Private offices have a larger coverage area and higher ceilings, so sensor placement options are more numerous. There is, however, a problem with the furniture layout. If the light switch is unobstructed from the rest of the room, an in-wall occupancy sensor is an option. Generally, you are better off with a wall-mounted or ceiling-mounted occupancy sensor.

Important Points To Consider While Installation

 

  • The desk needs to be situated within the area in which a sensor detects minor motions.
  • The sensor should be able to see the door clearly.
  •  If you are using wall-mounted or in-wall sensors, make sure high furniture, like bookcases, doesn't obstruct the view.
  •  The view of any sensor mounted to the wall or in the wall shouldn't be obscured by any door when the door is opened.
  • Provide the sensor with a view that will not be obstructed when the door is open.
  •   It is recommended that sensors not be installed near air vents because airflow and vibration  can compromise sensors' functionality
  •  Do not position the sensor outside space's door. When you install a ceiling sensor, keep it near a wall with a door on it. Install the sensor on the wall with the door if it is a wall-mounted sensor.

 

Placement of sensors in Restrooms

An occupancy sensor would be well suited for restrooms since the rooms are only in use periodically during the day. For an occupancy detector to work effectively in a large bathroom, it's essential to determine the exact area to monitor.

Important Points To Consider While Installation

 

  • A sensor (s) should cover each entrance and open area. Customers can select their own stall coverage.
  •  If the stalls are not covered by sensors, the timeout should be longer (between 15 and 30 min) to avoid an automatic turnoff when the stall is occupied.
  •  Multiple sensors may be required in restrooms that are shaped differently or have a different entrance room.
  •  For individual bathrooms, a sensor embedded in the wall may be sufficient.
  • It is recommended that sensors not be installed near air vents because airflow and vibration can compromise sensors' functionality.

 

Placement of sensors in Conference rooms

There needs to be an occupancy sensor installed in every conference room, including conference tables, the entrances, and maybe even the presentation area. A sensor's view of the room should also not be obstructed by anything inside, such as ceiling fixtures, furniture, or doors.

 

Important Points To Consider While Installation

 

  • Avoid placing the sensor facing the door of the room. Place ceiling sensors near the door on the wall. For wall-mounted sensors, mount them near the door.
  • Ensure that the sensors’ view of the entrance cannot be obscured by an open door. To cover the entrance, you may need another sensor.
  • It is recommended that sensors not be installed near air vents because airflow and vibration can compromise sensors' functionality.

 

 

Placement of sensors in classrooms

For classroom sensor solutions, it is necessary to prioritize the focal points of that room, including a teacher's desk or a seating arrangement at the rear of the classroom. In addition, it is essential that the sensor covers the entrance of the room so that it does not look out the door of the adjacent room. These focus areas should always be within the sensor's motion-sensitivity range.

Important Points To Consider While Installation

 

  • In general, you should avoid having ceiling-mounted occupancy sensors in the classroom due to the tendency for things to hang from the ceiling, which might block the sensors' view.
  • Sensors should be installed on the teacher's desk, at the entrance, and in any area where people may sit for a long period of time.
  • Avoid placing the sensor facing the door of the room. Place ceiling sensors near the door on the wall. For wall-mounted sensors, mount them near the door.
  • Ensure that the sensors’ view of the entrance cannot be obscured by an open door. To cover the entrance, you may need another sensor.
  • It is recommended that sensors not be installed near air vents, because airflow and vibration can compromise sensors' functionality.

 

Conclusion

 

As much as thermostats were once necessary for controlling HVAC systems, occupancy sensors are becoming equally important in the future. They ensure that occupants are provided with demand-controlled ventilation, so in addition to providing more comfortable environments for occupants, they also improve sustainability.

 

Taking into consideration occupant and daily usage patterns, occupancy sensors play a critical role in reducing commercial building energy usage. Apart from the commercial buildings, occupancy sensors can be used in the kitchen areas, Gym areas, Schools, Washrooms.

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