Motion Detector indoor
In many cases, installing motion detectors indoors is well worth considering. Automatically controlled lighting saves a significant amount of energy, eliminates the risk of lights being left on accidentally, and extends the lifespan of luminaires through demand-based operation. The watt24 range includes indoor motion detectors and presence sensors from Steinel, Theben, ESYLUX, Lunatone and Casambi – from simple corridor installations to complex DALI light management systems.
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Which motion detector is suitable for indoor use?
The right sensor technology depends strongly on the application and mounting location.
PIR sensors (passive infrared) are well suited for garages, stairwells and corridors thanks to their wide detection area. They reliably detect heat movement and are robust in operation.
HF sensors (high frequency) respond to even the smallest movements and can detect activity through thin walls or doors. This makes them ideal for offices, living spaces, sanitary areas and rooms with complex geometries.
Ultrasonic sensors use sound waves to cover an entire room, including around obstacles. However, they cannot detect movement behind walls or doors – they are therefore best suited for clearly defined indoor spaces.
Surface or flush mounting?
Flush-mounted motion detectors are recessed directly into the wall and are visually unobtrusive. They are hardwired rather than battery-powered. Since retrofitting is labour-intensive and costly, flush-mounted versions are best suited for new builds or comprehensive renovations.
For retrofitting, surface-mounted motion detectors are the better choice. Many models plug directly into a socket or are battery-powered – installation is straightforward and flexible.
Motion detector vs. presence sensor
Both terms are often used interchangeably, but they refer to different sensitivity levels. A standard motion detector registers larger movements – such as entering a room – and switches the light on for an adjustable hold time.
Presence sensors are tuned far more finely: they keep the light on as long as someone is in the room, even during minimal activity like quiet desk work. This is particularly valuable in offices and meeting rooms, where the light should not switch off just because nobody happens to be moving around.
Wall or ceiling luminaire with integrated motion detector
Wall or ceiling luminaires with a built-in motion detector offer a straightforward solution for automated indoor lighting. When using a separate sensor, make sure the luminaires used deliver full light output immediately and do not exceed the sensor's maximum permitted electrical load.
Motion detectors and smart home
Many modern indoor sensors are smart home-compatible. Some models send notifications when activity is detected; others can be fully configured via app without direct access to the device. For professional commercial installations, DALI-2-, KNX- and Casambi-compatible sensors are available for seamless integration into existing light management systems.
Frequently asked questions about indoor motion detectors
Which motion detector is best suited for indoor use?
It depends on the location. PIR sensors are well suited for garages, corridors and stairwells. HF sensors respond to the smallest movements and detect activity through walls or doors – ideal for offices and sanitary areas. Ultrasonic sensors provide full coverage of irregularly shaped rooms but cannot detect movement behind walls.
What is the difference between a motion detector and a presence sensor?
A motion detector reacts to larger movements and keeps the light on for an adjustable hold time. A presence sensor is more finely tuned: it keeps the light on as long as someone is in the room, even during quiet desk work. Presence sensors are the better choice for offices and workspaces.
Surface or flush mounting – which is better for indoor motion detectors?
Flush-mounted versions are visually unobtrusive but difficult to retrofit – best suited for new builds. Surface-mounted models are more flexible: many plug into a socket or run on batteries, making them ideal for retrofitting.
Can indoor motion detectors be connected to smart home systems?
Yes. Many modern models are smart home-compatible and configurable via app. For professional installations, DALI-2-, KNX- and Casambi-compatible sensors are available.