Ceiling Mount Occupancy Sensor, PIR, Low Voltage

Model: OAC-P

The MicroSet Passive Infrared Low Voltage Occupancy Sensing Ceiling Sensor is a motion sensing lighting control that is used for energy savings and convenience.

The sensor is designed to detect motion from a heat-emitting source (such as a person entering a room) within its field-of-view and automatically switch lights ON. These sensors have multi-segmented lenses. For units to sense motion, the person must cross between two segments. The distance between segments increases the farther you are from the sensor, so motion has to be larger the farther you are from the unit. PIR sensors are considered line-of sight sensors, meaning that the sensor must be able to have a direct line-of-sight to the person making the motion. The sensor includes self-adaptive technology that continuously self-adjusts sensitivity and Time Delay in real-time, maximizing the potential energy savings that are available in the particular application. In Automatic On Mode, the lights turn ON when a person enters the room.  In Manual On Mode (-R model only), the lights are turned ON by activating a momentary switch (model # GMDS-*) that is connected to the sensor. The MicroSet Passive Infrared Low Voltage Ceiling Sensor has an ambient light level sensor. When enabled, the daylighting feature (-R units only) prevents lights from turning ON when the room is adequately illuminated by natural light.


Ceiling Mount Occupancy Sensor, PIR, Low Voltage



  • Passive Infrared (PIR)


  • Size: 1.42” H x 4.5” W (36.068mm x 114.3mm)
  • Mounting: Mounts directly to ceiling tile, to a 4” square box and round mud ring or to 4” octagon box


  • Operating temperature: 32°F to 104°F (0°C to 40°C)
  • Relative humidity operating: 20% to 90% non-condensing
  • For indoor use only
  • Housing: Durable, injection molded housing.  Polycarbonate resin complies with UL 94V-0


  • Power Requirements:
    • Input:
      • 10-30 VDC from Greengate Switchpack or Greengate system
      • Maximum current needed is 10mA per sensor
    • Output:
      • Open collector output to switch up to ten Greengate Switchpacks
      • BAS with Isolated Form C Relay in (-R) model
      • Isolated Form C Relay Ratings: 1A 30 VDC/VAC

Hardware Specifications:

  • LED Indicators: Red LED for PIR detection 

Controls and Performance:

  • Time delays:  Self-adjustable, 15 seconds/test (10 minutes Auto), or Selectable 5, 15, 30 minutes, or Zero Time Delay
  • Coverage:  500 and 1,500 sq. ft.
  • Light sensing level (-R Models):  0 to 300 foot candles


  • cULus Listed - Energy Management Equipment (UL916)
  • FCC Compliant
  • RoHS Compliant
  • MicroSet self-adjusting Time Delay and sensitivity
  • Optional built-in light level sensor  
  • Optional BAS/HVAC isolated relay
  • Products tested to NEMA WD 7 - 2011 Occupancy Motion Sensors Standard
  • Selectable Walk-Through Mode 
  • Dual Relay control