PIR stands for Passive Infrared. We commonly use the term PIR in the context of a PIR sensor, which detects movement to initiate an electronic device. When do we use PIR?

Lux - fixed or adjustable level of environmental brightness to differentiate between night and day. A PIR sensor can detect infrared energy from an object. This infrared energy is detectable in the form of light generated by the heat of an object. So, for example, people and animals can be detected, as also other things that create heat, such as cars, motorbikes, etc. If an object enters within the detection range or field of view of a PIR sensor, it will trigger the action. What is the Difference Between a PIR Sensor & a Motion Sensor? A motion sensor is triggered based on a percentage of pixel change within its field of view. This percentage can vary depending on the sensitivity of the sensor. A motion sensor is similar to a PIR sensor because it will trigger an action when objects enter its field of view, but it uses size as a measure instead of infrared energy. What is the Difference between a PIR Sensor and a Dusk To Dawn Sensor?If you’re decorating your house or doing some home renovations and need to move a PIR alarm sensor, then the good news is that it’s relatively straight-forward to do. N.B.1 when you disconnect the wires from the sensor if you have a tamper zone wired in, then this will set the alarm off. Simply enter your code to stop the alarm. At this point a ‘tamper warning’ will appear on your alarm. A Dusk To Dawn sensor detects the level of brightness of an area, and if the brightness reaches a predetermined level, it will initiate an action. For example, Dusk To Dawn sensors are used on certain outdoor lights to switch the light on once the day becomes dusk. Then, as morning comes and brightness increases, the Dusk Until Dawn sensor will switch the light off. So while a PIR sensor activates the light based on detected movement, a Dusk Until Dawn sensor activates the light based on the detected brightness of the environment. The level of brightness that activates the Dusk Until Dawn sensor is known as the lux. How to Adjust PIR Lights PIR sensor switches are particularly useful in situations where you need hands free lighting automation, such as entering a room with your hands full or needing hands free automation for hygiene purposes, such as public toilets, corridors or other buildings where light is only needed as and when required. If there’s a plastic ‘lens’ inside the sensor, carefully remove this too – as otherwise it’s likely to fall out

Double Sensors - motion detection in front of the light and also underneath the fixture and against walls.

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N.B.2 if you want to carry on using your alarm system, you’ll have to ‘OMIT’ the zone that you’ve just removed, otherwise the alarm won’t set / work (see notes below on how to get your system working again). PIR lights are often available with a range of different adjustable settings. For example, on many types of PIR sensors, settings like the detection range, lux, the length of time that the light remains on after being triggered, the brightness of the light, and the physical direction of the sensor can all be adjusted. The typical settings of PIR lights can include: