Technical Bulletin

ManualsBrandsLeviton ManualsElectricalCeiling Mount Occupancy Motion Sensor, White

March 17, 2010

RE: Technical Bulletin: PIR and US Sensor Technology

Leviton Passive Infrared (PIR) and Ultrasonic (U/S) Occupancy Sensors

Leviton Key Advantages

 As compared to competition, Leviton integrates features and configurations to simplify the part number

selection and reduce your inventory carrying costs. (examples included are: Vandal Resistance,

Photocell, Multiple Voltages and Field Configurable/Technology Disable, Multiple lenses, etc.)

 Mechanical Latching relays, standard on all wallbox models, makes ours the most durable and robust

occupancy sensors available.

 No-Neutral versions are available as a standard SKU across all wall box sensors (excluding nightlight

models) making retrofits a breeze.

 Patented Blinders are built into wall switch sensors eliminating the need for masking tape for a truly

professional installation.

 Sensor field of view is the largest in the industry and is de-rated to assure optimal coverage.

 NAFTA compliant and Made in the USA sensors are available to meet government project

requirements. (see www.leviton.com/nafta and www.leviton.com/usa for a complete listing of sensor

part numbers)

This section of the document will cover three different aspects of Occupancy Sensors: Coverage area, Field of

view, and Coverage pattern.

Coverage Area

Coverage area is represented in square feet at the floor. Coverage is dependent on mounting location and

height, magnitude or quality of detectable motion, direction of motion compared to placement, ambient

temperature, and sensitivity adjustment.

General Rules: Optimal placement for a PIR sensor is essential. PIR sensors have a specialized lens used to

create “detection zones.” As the mounting height and distance from the sensor increase so does the zone

coverage, requiring larger movements for detection. This is referred to as Major Motion. Minor Motion on the

other hand, means that less movement is required for detection. I

In other words, the PIR sensors divide an area into zones of coverage – “detection zones”. The greater the

distance from the occupancy sensor, the larger the detection zones increase and then the coverage area has

gaps between “detection zones”, resulting in detection zones growing in size within the coverage area. Larger

detection zones require large motion to activate the sensor. Larger or oddly shaped spaces may require more

sensors in order to detect motion throughout the area. In order to regulate and control detection zones, multiple

lens types maybe required for different coverage patterns, and variable mounting heights.

Leviton Advantage: High performance pyrometers and advanced Fresnel Lens technology provide the best

and most consistent coverage on the market.

Field of View (FOV)

Occupancy Sensors Switch PIR FOV

Summary of content (5 pages)

PAGE 1
March 17, 2010 RE: Technical Bulletin: PIR and US Sensor Technology Leviton Passive Infrared (PIR) and Ultrasonic (U/S) Occupancy Sensors Leviton Key Advantages  As compared to competition, Leviton integrates features and configurations to simplify the part number selection and reduce your inventory carrying costs. (examples included are: Vandal Resistance, Photocell, Multiple Voltages and Field Configurable/Technology Disable, Multiple lenses, etc.
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 Leviton supplies dual pyrometers to generate the best PIR detection possible in a 180° FOV, with a maximum coverage area of approximately 2100 square feet. PIR as a line-of-sight technology has a maximum sensing distance in front of the sensor of 40 feet, with a 60 foot span (30 feet on each side of the sensor). PIR technology is optimal when the following is considered: Heat + Size of Heat Movement + Time Delay = Lights ON.
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conditions. PIR increases immunity by inanimate motion in an unoccupied space. U/S transducers maximize sensitivity to minor motion. Multi-technology utilizes the best of both to provide optimal energy savings. Adding U/S technology to wall switch sensors assists with some of the challenges of having a sensor in these traditionally troublesome locations.
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Occupancy Sensor Testing (Walk Test) This section of the document will cover the testing parameters for occupancy sensors: Standard Field of View Walk Test, and Two/One Walk Test. (established tests are specified by NEMA but we have found them to not be an accurate assessment of the customer experience and have thus increased our testing.
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Lighting Fixture operations (101) This section will cover three different aspects of lighting fixtures: Occupancy Sensor, Electronic Ballasts, and Fluorescent Ballasts Occupancy Sensors Sensors are a simple relay device, similar to a light switch. When motion is detected a relay closes completing the current path to the ballast which then “strikes” the lamp. Electronic Ballasts Ballast selection and operation varies, always consult a ballast manufacturer for operation and best practices.