Motion detector

What are the differences between KNX motion detectors and KNX presence detectors? And how do I know which devices are the right ones for my application? We describe what you should look out for when buying a motion detector and provide you with useful information on use and installation in the following article.

How do you differentiate between KNX presence detectors and KNX motion detectors?

A basic distinction is made between KNX presence detectors and KNX motion detectors in the conventional area or in home and building automation, whereby presence detectors can usually also be used as motion detectors and are therefore often the better choice.

The differences and main advantages of a presence detector compared to a motion detector (simplest light measurement, interference from artificial light) are the variable usage options due to the special and permanent light measurement (daylight and/or mixed light), even during the switch-on process. The light value is measured with a special sensor, which has a spectral sensitivity similar to that of the human eye.

 


TIP:

For outdoor use, use motion detectors that have several function blocks in the sensor technology in order to control independently of the brightness and/or depending on the brightness.


 

So the typical difference lies in the application. A KNX motion detector is used to switch on when motion is detected and the purpose of a KNX presence detector is to switch consumers on or off when no more movement is detected or a brightness limit has been exceeded in order to save energy. An exemplary application would be in a toilet. Here I would like during the day that the lighting is not activated when there is sufficient brightness. This is realized by the motion detector function. However, the fan should switch on with the presence. If the brightness is insufficient, both should of course be switched on. This function is often enabled by presence detectors that have several channels. The motion detector channel is used brightness-controlled for switching lighting and the presence detector channel for brightness-independent switching of other consumers, such as a fan.

Which areas of application are typical for the respective KNX presence detectors and KNX motion detectors?

The complex sensor technology in a presence detector can detect sensitive movements, which are particularly typical for office workplace applications or workplaces. A motion detector is used in small rooms, bathrooms, storage rooms, garages, corridors, stairwells or for monitoring outdoor areas.

What function can KNX detectors take on?

Both indoor and outdoor versions naturally have a wide range of parameters for switching or dimming lighting, moving blinds or shutters, applications for heating, air conditioning and ventilation, master/slave functions, blocking operation functions, logic functions, functions for pets (animal lane), detector operation for Alarm systems with other sensitivity modes, sneak-by protection, rear field surveillance, stairwell surveillance, constant light controls and much more.

eibabo®, Theben theLuxa P300 KNX WH outdoor motion detectorImage: Theben theLuxa P300 KNX WH outdoor motion detector

Multiple channels are often provided to control individual functions.

What questions should you ask yourself before you buy?

  • Is the installation indoors or outdoors?
  • What should the detector react to?
  • Which area should be monitored?
  • What actions should the detector take?
  • For what performance must the device be designed?
  • What lines and cables are there or need to be re-laid?
  • and much more

 

Where should a KNX motion detector or KNX presence detector be installed?

The detection areas and the necessary mounting heights can vary greatly and should be selected appropriately for the required application.

 


NOTE:

The higher the mounting height, the greater the range of the device, but the sensitivity decreases.


 

If the area to be monitored is too large, it is advisable to use additional detectors to ensure complete presence detection. In any case, sources of interference must be avoided in order to ensure proper functioning of the device and to rule out false signals. This includes not only objects that obstruct the view, but also dazzling light sources or objects that can quickly change the temperature of the detection area.

the right angle

Depending on the model, presence detectors and motion detectors detect a specific area of the environment. The spectrum ranges from very close and targeted monitoring to 360° detection.


When making your selection, also pay attention to whether a motion detector will be exposed to the weather. In these cases, choose a waterproof device and clean the sensor regularly.

Why is my KNX presence detector not working properly?

Proper functioning depends on various factors. Assuming that the installation has been carried out correctly, the most common malfunctions are that the detection area is not set optimally. Either the direction is wrong, the angle of detection or the distance is too small or too large, or the device itself is not suitable for the corresponding area of application.

The fewer movements to be expected in the monitored area, the longer you should choose the run-on time. Because as soon as a detector detects a movement, the follow-up time is restarted again and again.

Are there KNX motion detectors or KNX presence detectors with special properties?

Yes, in the eibabo® technology store you can get detectors for many different applications. Depending on your requirements, you can choose, for example, from classic KNX motion detectors for outside or inside, KNX presence detectors, KNX guards, KNX passive infrared motion detectors, KNX PIR detectors, KNX presence detector interfaces, KNX detectors with high-frequency sensor technology, KNX ceiling presence detectors, KNX wall presence detectors, KNX automatic switches , KNX automatic top units, radio bus motion detectors, KNX radio solar motion detectors, KNX corridor presence detectors, KNX comfort presence detectors, KNX presence detectors with constant light control, KNX guard sensors, KNX presence detectors with DALI, KNX radio motion detectors, KNX radio guards or KNX IR presence detectors Plus. Each of these models has its own strengths and is optimized for individual applications.

What is a passive infrared motion detector?

Passive infrared motion detectors (PIR) detect the movement of heat-emitting objects. They are equipped with so-called pyrosensors that react to infrared light of a specific wavelength. A vehicle with its engine running radiates heat in the same way as a human body. A PIR detector detects their movement and responds with optical, electrical or acoustic alarm signals.

Already knew?

Infrared is particularly long-wave light that cannot be seen by the human eye, but can be perceived as heat radiation.


A classic motion detector can quickly reach its limits, especially in very dark surroundings or in heavy fog. A PIR detector is a good alternative for this because it detects changes in the thermal image.

What do I use a KNX detector with high-frequency sensor technology for?

High-frequency sensor technology involves signals in the frequency range between several hundred megahertz and several hundred gigahertz. These signals do not require a medium to propagate in space and penetrate, among other things, wood, glass and lightweight walls.

Therefore, this technology is also used in mobile communication and data transmission. A KNX detector with high-frequency sensor technology is used wherever the presence or movement of objects cannot be detected directly for reasons of personal protection or data protection. Classic application examples are public toilets or changing rooms.

What is a KNX multisensor?

As the name suggests, this is a presence detector with an extended range of functions. In addition to the reliable detection of people and animals, a KNX multi-sensor also determines brightness, room temperature, humidity, air quality, volatile organic compounds and the CO2 content in the air. Such a device can be used, for example, for early fire detection or for monitoring areas in which a certain air quality or a constant climate must be maintained (classrooms, laboratories, greenhouses).

Who manufactures KNX presence detectors and KNX motion detectors?

Here in the shop you can get detectors from the brands ABB, Berker, Busch-Jaeger, Eaton, EIBMARKT, eQ-3, Esylux, Gira, Hager, Issendorf, Jung, MDT, Merten, Peha, Siemens, Steinel and Theben at top conditions.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Installation bus systems > Movement sensor for bus system you will find items from the following product groups:

Item overview:

  • Ceiling adapter
  • Compact guard
  • Corner mount
  • Cover panel
  • Detection aperture
  • Fully automatic
  • Gear sensor
  • Home control
  • In-ceiling sensor
  • Lighting
  • Moellerfunk
  • Motion detector
  • Motion sensor
  • Networking
  • Nickel metallic
  • Outdoor area
  • Outdoor motion detector
  • Parallel circuit
  • Presence detector
  • Presence guard
  • Radio system
  • Radio transmitter
  • Remote control
  • Splash proof
  • Temperature sensor
  • Ultrasonic sensor
  • Wall transmitter
  • Wireless solution


from the following manufacturers:

Manufacturer overview catalogue Motion detector:

  • ABB
  • Arclite
  • Berker
  • Busch Jaeger
  • Eaton
  • EIBMARKT
  • ESYLUX
  • frogblue AG
  • Gira
  • Hager
  • Issendorff
  • Jung
  • MDT
  • Merten
  • Peha
  • Siemens
  • Steinel
  • Theben
  • WAGO


 
What are the differences between KNX motion detectors and KNX presence detectors? And how do I know which devices are the right ones for my application? We describe what you should look out for... read more »
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KNX motion detectors and KNX presence detectors

What are the differences between KNX motion detectors and KNX presence detectors? And how do I know which devices are the right ones for my application? We describe what you should look out for when buying a motion detector and provide you with useful information on use and installation in the following article.

How do you differentiate between KNX presence detectors and KNX motion detectors?

A basic distinction is made between KNX presence detectors and KNX motion detectors in the conventional area or in home and building automation, whereby presence detectors can usually also be used as motion detectors and are therefore often the better choice.

The differences and main advantages of a presence detector compared to a motion detector (simplest light measurement, interference from artificial light) are the variable usage options due to the special and permanent light measurement (daylight and/or mixed light), even during the switch-on process. The light value is measured with a special sensor, which has a spectral sensitivity similar to that of the human eye.

 


TIP:

For outdoor use, use motion detectors that have several function blocks in the sensor technology in order to control independently of the brightness and/or depending on the brightness.


 

So the typical difference lies in the application. A KNX motion detector is used to switch on when motion is detected and the purpose of a KNX presence detector is to switch consumers on or off when no more movement is detected or a brightness limit has been exceeded in order to save energy. An exemplary application would be in a toilet. Here I would like during the day that the lighting is not activated when there is sufficient brightness. This is realized by the motion detector function. However, the fan should switch on with the presence. If the brightness is insufficient, both should of course be switched on. This function is often enabled by presence detectors that have several channels. The motion detector channel is used brightness-controlled for switching lighting and the presence detector channel for brightness-independent switching of other consumers, such as a fan.

Which areas of application are typical for the respective KNX presence detectors and KNX motion detectors?

The complex sensor technology in a presence detector can detect sensitive movements, which are particularly typical for office workplace applications or workplaces. A motion detector is used in small rooms, bathrooms, storage rooms, garages, corridors, stairwells or for monitoring outdoor areas.

What function can KNX detectors take on?

Both indoor and outdoor versions naturally have a wide range of parameters for switching or dimming lighting, moving blinds or shutters, applications for heating, air conditioning and ventilation, master/slave functions, blocking operation functions, logic functions, functions for pets (animal lane), detector operation for Alarm systems with other sensitivity modes, sneak-by protection, rear field surveillance, stairwell surveillance, constant light controls and much more.

eibabo®, Theben theLuxa P300 KNX WH outdoor motion detectorImage: Theben theLuxa P300 KNX WH outdoor motion detector

Multiple channels are often provided to control individual functions.

What questions should you ask yourself before you buy?

  • Is the installation indoors or outdoors?
  • What should the detector react to?
  • Which area should be monitored?
  • What actions should the detector take?
  • For what performance must the device be designed?
  • What lines and cables are there or need to be re-laid?
  • and much more

 

Where should a KNX motion detector or KNX presence detector be installed?

The detection areas and the necessary mounting heights can vary greatly and should be selected appropriately for the required application.

 


NOTE:

The higher the mounting height, the greater the range of the device, but the sensitivity decreases.


 

If the area to be monitored is too large, it is advisable to use additional detectors to ensure complete presence detection. In any case, sources of interference must be avoided in order to ensure proper functioning of the device and to rule out false signals. This includes not only objects that obstruct the view, but also dazzling light sources or objects that can quickly change the temperature of the detection area.

the right angle

Depending on the model, presence detectors and motion detectors detect a specific area of the environment. The spectrum ranges from very close and targeted monitoring to 360° detection.


When making your selection, also pay attention to whether a motion detector will be exposed to the weather. In these cases, choose a waterproof device and clean the sensor regularly.

Why is my KNX presence detector not working properly?

Proper functioning depends on various factors. Assuming that the installation has been carried out correctly, the most common malfunctions are that the detection area is not set optimally. Either the direction is wrong, the angle of detection or the distance is too small or too large, or the device itself is not suitable for the corresponding area of application.

The fewer movements to be expected in the monitored area, the longer you should choose the run-on time. Because as soon as a detector detects a movement, the follow-up time is restarted again and again.

Are there KNX motion detectors or KNX presence detectors with special properties?

Yes, in the eibabo® technology store you can get detectors for many different applications. Depending on your requirements, you can choose, for example, from classic KNX motion detectors for outside or inside, KNX presence detectors, KNX guards, KNX passive infrared motion detectors, KNX PIR detectors, KNX presence detector interfaces, KNX detectors with high-frequency sensor technology, KNX ceiling presence detectors, KNX wall presence detectors, KNX automatic switches , KNX automatic top units, radio bus motion detectors, KNX radio solar motion detectors, KNX corridor presence detectors, KNX comfort presence detectors, KNX presence detectors with constant light control, KNX guard sensors, KNX presence detectors with DALI, KNX radio motion detectors, KNX radio guards or KNX IR presence detectors Plus. Each of these models has its own strengths and is optimized for individual applications.

What is a passive infrared motion detector?

Passive infrared motion detectors (PIR) detect the movement of heat-emitting objects. They are equipped with so-called pyrosensors that react to infrared light of a specific wavelength. A vehicle with its engine running radiates heat in the same way as a human body. A PIR detector detects their movement and responds with optical, electrical or acoustic alarm signals.

Already knew?

Infrared is particularly long-wave light that cannot be seen by the human eye, but can be perceived as heat radiation.


A classic motion detector can quickly reach its limits, especially in very dark surroundings or in heavy fog. A PIR detector is a good alternative for this because it detects changes in the thermal image.

What do I use a KNX detector with high-frequency sensor technology for?

High-frequency sensor technology involves signals in the frequency range between several hundred megahertz and several hundred gigahertz. These signals do not require a medium to propagate in space and penetrate, among other things, wood, glass and lightweight walls.

Therefore, this technology is also used in mobile communication and data transmission. A KNX detector with high-frequency sensor technology is used wherever the presence or movement of objects cannot be detected directly for reasons of personal protection or data protection. Classic application examples are public toilets or changing rooms.

What is a KNX multisensor?

As the name suggests, this is a presence detector with an extended range of functions. In addition to the reliable detection of people and animals, a KNX multi-sensor also determines brightness, room temperature, humidity, air quality, volatile organic compounds and the CO2 content in the air. Such a device can be used, for example, for early fire detection or for monitoring areas in which a certain air quality or a constant climate must be maintained (classrooms, laboratories, greenhouses).

Who manufactures KNX presence detectors and KNX motion detectors?

Here in the shop you can get detectors from the brands ABB, Berker, Busch-Jaeger, Eaton, EIBMARKT, eQ-3, Esylux, Gira, Hager, Issendorf, Jung, MDT, Merten, Peha, Siemens, Steinel and Theben at top conditions.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Installation bus systems > Movement sensor for bus system you will find items from the following product groups:

Item overview:

  • Ceiling adapter
  • Compact guard
  • Corner mount
  • Cover panel
  • Detection aperture
  • Fully automatic
  • Gear sensor
  • Home control
  • In-ceiling sensor
  • Lighting
  • Moellerfunk
  • Motion detector
  • Motion sensor
  • Networking
  • Nickel metallic
  • Outdoor area
  • Outdoor motion detector
  • Parallel circuit
  • Presence detector
  • Presence guard
  • Radio system
  • Radio transmitter
  • Remote control
  • Splash proof
  • Temperature sensor
  • Ultrasonic sensor
  • Wall transmitter
  • Wireless solution


from the following manufacturers:

Manufacturer overview catalogue Motion detector:

  • ABB
  • Arclite
  • Berker
  • Busch Jaeger
  • Eaton
  • EIBMARKT
  • ESYLUX
  • frogblue AG
  • Gira
  • Hager
  • Issendorff
  • Jung
  • MDT
  • Merten
  • Peha
  • Siemens
  • Steinel
  • Theben
  • WAGO
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