![]() Limitations: Requires location specific commissioning, higher power requirements, prone to false-on triggers. This technology is capable of ‘seeing’ around corners.Īdvantages: Can ‘see’ around objects, detects minor movements. When there is movement in the space, the bounce back is read differently and the sensor knows there is movement in the space. Ultrasonic works by emitting a pulse into the space and receiving the bounce back. This makes ultrasonic a good option where small movements such as typing at a computer desk take place for extended periods of time. Ultrasonic technology in occupancy sensors is excellent for minor motion detection. PIR Sensor Pattern Ultrasonic Motion Detection The benefit is that a person walking in the room next to the space would not trigger the lights to turn on, but the drawback is that only major motion is detected. The illustration below shows where a PIR sensor would detect major motion and trigger lights in an open-office space. Limitations: Coverage is directional and limited to line of sight detects only major movement and so are prone to a false-off. It only detects heat in its direct range of view.Īdvantages: Cheap, small form factor, low power requirements and great for wireless applications. PIR works by detecting movement of heat sources in the space. Passive Infra-Red (PIR) occupancy sensors are best for detecting major motion like an occupant walking through a space. Below is a discussion of the basics of occupancy sensor technology. The widespread use of dual technology sensors have almost completely eliminated the common misperception that the lights will turn off while an occupant is present but sitting still. Newer technologies are rapidly turning that perception around to where we see virtually no occupant complaints regarding sensor use. However, when using some of the older technology sensors or when using sensors in inappropriate conditions, the results can be undesirable and uncomfortable for occupants.īecause of inappropriate use of inferior sensor technology in the past, there is a perception among users that occupancy sensors do not work well. Occupancy sensors have been around for decades and, when used correctly, can be a highly efficient means for saving energy, reducing light trespass, increasing security and lamp life, and decreasing fixture maintenance. In this article, we’ll explain the basics of occupancy sensors and their important counterpart, the vacancy sensor. ![]() But, as with any high-performance strategy, there are subtleties to the technology and application. ![]() Properly applied, lighting controls can easily reduce that portion by 25%. So I'm going to select my lighting switch, I'm going to click on Edit Type, and for my Label right here I'm going to get rid of DR.In a high-performance office building, lighting can account for 20% of energy use. ![]() Now these automatically tag themselves, but I'm not a big fan of it. I'm going to pick a spot, like right about here, and I'm going to hit Escape a couple times. Don't worry about that big, ugly DR, we're going to get rid of that. I'm going to put mine right next to the door. So I'm going to come down here and I'm going to grab Door. Now if we hit the drop-down here we'll see we have quite a few of them. Now on my Electrical panel I'm going to click my Device drop-down and I'm going to go down to Lighting. I want to zoom into these areas where we have lights and we're going to add some switches. I want to roll down to my Ceiling Plan Level 1. Well, we have no way to turn these lights on or off, so what I'd like to do is add some switches to our model.
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