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Key Technology Overview. Passive Infrared (PIR) Occupancy Detection. All PIR is not Created Equal… Sensors are fine-tuned at the factory for optimum detection for its coverage pattern – no PIR sensitivity adjustments required

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Passive Infrared (PIR) Occupancy Detection

  • All PIR is not Created Equal…
  • Sensors are fine-tuned at the factory for optimum detection for its coverage pattern – no PIR sensitivity adjustments required
  • Excellent small motion detection even at great distances and in unconditioned environments
  • Any sensor can detect a person in a warehouse in Minnesota in January…but be wary of using another brand in a warehouse in Arizona in July.

Passive Infrared (PIR) Occupancy Detection

  • 100% Digital PIR Detection
  • Provides best immunity from RF (RF interference can false trip some competitor’s PIR sensors )
    • Quicker Initial Power-up
    • Utilized on all WSX, CM(R), RM(R), CM(R)B, SB(R), SFR, WV models today

Microphonics Occupancy Detection (patented)

What Is Microphonics?

  • Detection technology using a microphone inside of the sensor to hear sounds indicating occupancy
  • Common applications are rooms with obstructions, such as bathrooms with stalls or open office cubicle areas
  • Never used by itself, Microphonics is always coupled with PIR
  • Referred to as having Passive Dual Technology (PDT),occupant motion must initially be seen by the PIR to turn the lights on, after which occupants can either be seen (via PIR) or heard (via Microphonics) for the lights to remain on

Microphonics Occupancy Detection (patented)

How Is Microphonics Different Than Ultrasonic Technology?

  • Better & more reliable detection
    • No false ons from common building motion
    • Detecting both sound and motion results in better occupant detection than sensors that use two technologies to only detect motion (and thus no false offs).
  • Requires less power
  • Acoustically Passive - sensors transmit no sound waves, thus eliminating all potential for interference (see following slide)

Microphonics Occupancy Detection (patented)

Ultrasonic Technology is notAcoustically Passive

Distance from Sensor (ft)

Ultrasonic Occupancy Sensors

Ultrasonic Rodent Repellent Device


Microphonics Occupancy Detection (patented)

How does Microphonics work in a noisy environment?

  • Only detects leading edge noises typical of human activity (e.g., talking, typing, rustling papers, etc.)
  • Filters out building noises (e.g., HVAC rumbles or air currents).
  • Automatic gain control (AGC) techniques are used to dynamically self-adapt a sensor to its environment by filtering out constant background noise.

Microphonics Occupancy Detection (patented)

Additional Microphonic Intelligence

  • Advanced digital acoustic filtering prevents the prolonged presence of varying noises without any PIR events, such as leaving a television or radio on, from keeping the lights on.
  • Sounds with periodicity, such as consistent clicks from a clock, are also filtered out
  • Microphone “observes” retrips caused by spikes of electrical noise on the line right after a load is switched off and “locks them out”
  • Microphone knows the sound of its own relay switching and filters it out
  • Microphone is left on for 10 sec after lights are turned off to allow for voice reactivation
you can t turn your back on our sensors
You can’t turn your back on our sensors

Microphonics Occupancy Detection (patented)

you can t hide in the bathroom either
You can’t hide in the bathroom either!

Microphonics Occupancy Detection (patented)

energy savings comparison on times sensor switch vs competition
Energy SavingsComparison On Times - Sensor Switch vs. Competition

Example 1

  • Occupied Time: 10 Minutes
  • Occupancy Sensor Time Delay:
    • Typical Sensor Brands: 20 min (default)
    • Sensor Switch: 10 min (default)
  • Total On Time of Lamps:
    • Typical Sensor Brands: 30 min
    • Sensor Switch: 20 min

Extra 33% Savings!

lampmaximizer technology what is the lampmaximizer
LampMaximizer® TechnologyWhat is the LampMaximizer®?
  • Patented sensor intelligence that enables users to aggressively target energy savings while still protecting lamp life.
  • LampMaximizer (Minimum On Time)
    • Sensors utilize two timers instead of just one
      • Minimum On Timer (15 min default) – preserves lamp life by eliminating all lamp cycles shorter than lamp manufacturers recommendations.
      • Standard occupancy time delay (10 min default) – lower time delay increases energy savings
    • Both timers are user adjustable via push-button
  • Test mode
    • Enables convenient and quick operational testing
    • Disables minimum on timer
    • Sets Occupancy Time Delay to 30 sec
    • Reduces photocell transition periods to < 5 sec
    • Speeds up dimming rates to maximum
    • Sensor will revert to normal operation if left for 10 minutes
energy savings w lampmaximizer technology comparison on times sensor switch vs competition
Energy Savings w/ LampMaximizer® TechnologyComparison On Times - Sensor Switch vs. Competition

Example 2

  • Occupied Time: 2 Minutes
  • Occupancy Sensor

Time Delay:

    • Typical Sensor Brands: 20 min
    • Sensor Switch: 10 min
  • Minimum On Timer:
    • 15 min (in this case it holds lights on for additional 3 min)

Still Provides 32% Savings!

lampmaximizer technology competitive conclusions
LampMaximizer® TechnologyCompetitive Conclusions


  • While all brand sensors meet lamp manufactures recommended on times, only Sensor Switch units do so without wasting potential energy savings
  • Only Sensor Switch trusts its detection technologies to utilize a 10 min occupancy time delay without the risk of increasing false offs

© 2013 Sensor Switch