Sharing our Guidance
Occupancy Sensors
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Occupancy Sensors
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ASHRAE 90.1 Lighting Control Requirements
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Occupancy Sensors
1. Passive Infrared (PIR)
Sense difference in heat
Require a direct line of sight
Limited sensitivity (15ft or less)
2. Ultrasonic
Sense change in frequency
Can see around corners and objects
Sensitivity up to 25ft
3. Dual-technology
Use PIR and ultrasonic technology
Greatly reduce false on/offs
Sensor Technology
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Occupancy Sensors
Ceiling/High Wall/Corner Mounted
Use in large areas with obstacles/corridors/aisles
Installation cost is 2 to 3 times greater
Economical if controlling large zones
Sensor Types
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Occupancy Sensors
Wall Switch
Use in small, enclosed spaces
Require a clear line of sight between
sensor and task area
Inexpensive and easy to install
Sensor Types (cont.)
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Occupancy Sensors
Workstation Sensors
Use in individual cubicles
Connect to power strip
Controls both plug in loads and lighting
Sensor Types (cont.)
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Occupancy Sensors
Leading cause of problems is improper coordination between coverage area and
required sensitivity.
Various sizes and shapes of coverage are available for each type of technology.
Small spaces may only require one sensor.
Large areas may require several sensors, each covering its own zone.
Coverage zones should overlap by 20%
Set time delay – 15 min recommended
Set sensitivity – reduce false-ons
Coverage
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Occupancy Sensors
Coverage (cont.)
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Ceiling Mount
Wall Mount
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Occupancy Sensors
1. Line Voltage Sensor – no power pack, less coverage
2. Self Calibration Sensor – install and forget
3. Manual On Sensor – manual turn on, automatic shut-off
4. Microphonics – detect noise within the area
5. Daylight Switching Sensor – use photo sensor, depends on daylight
6. Automatic Dimming – control dimming ballast
Special Features
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OCCUPANCY SENSORSCONCLUSION
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