Occupancy and Vacancy Sensors

Greengate offers a variety of occupancy and vacancy sensors to best meet the needs of any project. If the project requires a stand-alone solution for a small space, or a networked solution for wholebuilding control, sensors provide the minor motion detection to ensure efficiency is maximized. Greengate sensors automatically adjust to the building environment, eliminating the needs for constant re-calibration and reducing overall maintenance costs.

Occupancy vs. Vacancy Sensors

Occupancy Sensors

  • A occupancy sensor automatically turns the lights ON upon detection of motion and turns the lights OFF automatically after the area is vacated
  • Occupancy sensors may offer the option to switch the sensor from automatically turning the lighs ON to requiring manual button press from the occupant (Manual/Vacancy Mode)

Vacancy Sensors

  • A vacancy sensor requires manual activation of the lights by the occupant, then turns the lights OFF automatically soon after the area is vacated
  • A vacancy sensor does not offer an option of automatically turning the lights ON

Why would I use a Vacancy over an Occupancy Sensor?

  • ASHRAE 90.1-2010 and many other codes no longer permit the entire space to be switched on automatically upon occupancy. Automatic ON is only allowed for up to 50% of the controlled load. This requires a sensor that allows for Manual On capability for some or all of the load. For most applications, an occupancy sensor will meet this requirement as long as it allows for dual zone control and manual switch interface.
  • New York City Energy Code LL48/2010 states that where occupancy sensors are required, occupancy sensors cannot have an onboard override switch that converts from Manual On to Automatic On functionality. In New York City, vacancy sensors must be used to meet this requirement when used as a stand-alone solution.