Product Catalog - 2020 - E-3

WATTSTOPPER

OCCUPANCY/VACANCY SENSORS & TIMERS

Sensor Technologies

Passive Infrared Sensors (PIR)
Using a patented fresnel lens which minimizes optical aberrations, each Wattstopper® PIR
sensor breaks its coverage area into zones. Upon detecting an infrared energy change within
a zone, one of the elements in the dual-element pyroelectric sensing device of an occupancy
sensor generates a positive pulse. Within milliseconds, the other element produces a negative
pulse and the lights are turned on. Vacancy sensors turn lights off when the room is vacant for a
period of time, or when there is no infrared energy detected within a zone.
Passive infrared sensors are unable to detect occupancy around barriers, and are more effective
when sensing movement across their field of sight rather than towards or away from it.

All Wattstopper PIR occupancy sensors feature:
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Patented fresnel lenses with multi-segment design
Dual-element pyroelectric sensors
Low-profile design
Daylight filter systems
Adjustable settings for time and sensitivity
Custom Detection Signature Analysis for high immunity to RFI and EMI, and reliability
Self-adaptive technology is available on some models

Ultrasonic Sensors
Ultrasonic sensors use a multi-directional transmitter/receiver system to broadcast ultrasonic
sound waves generated by a quartz crystal oscillator, and then measure the amount of time it
takes the waves to return. Movement within the area results in the sound waves returning to the
sensor at a slower or faster rate, and thus occupancy is detected.
Ultrasonic sensors broadcast in three dimensions, and are therefore able to detect smaller
movements than PIR sensors. Proper placement of the sensors is essential as sound waves can
escape through open doorways, resulting in false triggering.
While Wattstopper ultrasonic sensors use special circuitry to filter out air-flow movement
caused by HVAC equipment or fans, sensors should be kept away from breezy areas. Also,
heavy carpeting and other sound-absorbing materials used in the construction of a room will
reduce coverage.

Wattstopper Ultrasonic Occupancy Sensor features:
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Temperature- and humidity-resistant tuned receivers
Signal Processing Circuitry
Solid-state, crystal-controlled transmitter
Adjustable controls for time and sensitivity

Dual Technology sensors combine PIR and Ultrasonic sensing in one device. This minimizes
false ONs and nuisance OFFs. Sensitivity adjustments and user selectable operational
characteristics make dual technology sensors the most versatile, even in the most difficult
installations.
Use dual technology sensors for the most demanding sensor applications. Odd shaped rooms,
lots of partitions, and changing floor plans can be handled best by dual technology sensors.

Wireless RF Sensor
The Wireless RF PIR Occupancy Sensor works with Series RF Wall Switches to turn lights
on and off based on occupancy. The sensor mounts on the ceiling and provides 360° passive
infrared coverage.

Wireless RF Wall Switches
RF Wall Switches work with wireless occupancy sensors, and optional remote switches, to turn
lights on and off based on occupancy. Models are available to control one or two switched legs
in applications with or without neutral wires at the switch box.

SENSORS & DIMMERS

Dual Technology

E-3

All devices listed on this page conform to NEMA WD-1 and WD-6.

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Product Catalog - 2020

Table of Contents for the Digital Edition of Product Catalog - 2020