PIR Sensors

PIR (passive infrared) sensors measure infrared (IR) light radiating from moving objects that emit heat. The sensor allows you to detect motion of people, animals and cars to trigger security alarms and lighting. They are often used in PIR-based motion detectors. PIR sensors are passive due to the fact that no heat or energy is emitted by the sensor and they detect the emission of infrared radiation and not heat.

Where are PIR sensors used?

These sensors are used to detect movement and are ideal for security and safety such as burglar alarms and security lighting systems. They can also be called PID passive infrared detectors (PID). They can be used internally & externally and can be mounted to ceilings & walls. PIR sensors have various ranges and styles including pet friendly options (designed to ignore certain shapes of moving objects, or only detect motion above a certain height). PIR sensors are used for applications such as automatically turning on lights when a person enters a room or causing a video camera to start recording.

How does a PIR sensor work?

All objects emit some level of radiation (not visible to the human eye) and the hotter something is, the more radiation is emitted. The sensor detects levels of infrared radiation impinging upon it which varies depending on the temperature of the objects in front of the sensor. When a warm object (person or animal) walks in front, the temperature in the sensor’s field of view will increase from room to body temperature. The sensor converts this change in the incoming infrared radiation into a change in the output voltage and this triggers the detection.

How are PIR sensors installed?

They are quick and easy to fit using the screws and plugs that are supplied to mount an adjustable bracket onto the wall or ceiling. They come in varying ranges, once you know the range of the sensor and how far it can detect you can therefore plan your security coverage. Areas recommended include corners, hallways, patios, driveways, front and back entries. Ideal position being 2 to 3 metres above the ground.

Motion sensors are also used in the work place for example to shut down equipment that could be dangerous if the worker gets too close.

These sensors should not be installed:

  • Directly above a radiator (change in infrared heat could trigger the alarm)
  • Directly looking into a window (sunlight can cause confusion for the sensor)
  • In rooms where a number of animals are present
  • Near air vents (temperature change might trigger the alarm)

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Description Price Detector Type Sensor Radius Battery Diameter Depth Width Height Series Tamper Resistant Additional Features
RS Stock No. 791-8260
BrandRS PRO
€10.93
Each
units
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RS Stock No. 851-2756
Mfr. Part No.600419
BrandSteinel
€44.55
Each
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RS Stock No. 524-4930
Mfr. Part No.BW8000
BrandABUS
€23.84
Each
units
PIR Motion Detector 15m - - 47 mm 60mm 106 mm XEVOX Yes HF Immunity, Look-Down Lens Protection
RS Stock No. 796-2015
BrandRS PRO
€49.43
Each
units
- - - - - - - - - -
RS Stock No. 740-4446
Mfr. Part No.6800-0-2519
BrandABB
€135.58
Each
units
PIR Motion Detector 24m - - 110 mm 110mm 70 mm BasicLine Corridor - Brightness Independent Test Mode, Detect 2.5 m Height, For Switching Lighting System
RS Stock No. 796-2009
BrandRS PRO
€36.44
Each
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RS Stock No. 327-7310
Mfr. Part No.AMN11111
BrandPanasonic
€22.16
Each
units
PIR Motion Detector 5m - 11mm - - 14.5 mm NaPiOn - -
RS Stock No. 796-2047
BrandRS PRO
€108.12
Each
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RS Stock No. 711-8568
BrandRS PRO
€96.74
Each
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RS Stock No. 851-2762
Mfr. Part No.608910
BrandSteinel
€96.33
Each
units
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RS Stock No. 524-5141
Mfr. Part No.BW8020
BrandABUS
€61.17
Each
units
PIR Motion Detector 15m - - 48 mm 60mm 107 mm XEVOX Yes White Light Immunity
RS Stock No. 851-2769
Mfr. Part No.608811
BrandSteinel
€96.67
Each
units
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RS Stock No. 796-2043
BrandRS PRO
€83.89
Each
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RS Stock No. 519-400
Mfr. Part No.LS1020
BrandABUS
€48.88
1 Set
Set(s)
IR Detector 20m - - 34 mm 46mm 95 mm Ecoline Yes -
RS Stock No. 524-5321
Mfr. Part No.BW8010
BrandABUS
€34.72
Each
units
PIR Motion Detector 15m - - 48 mm 60mm 107 mm XEVOX Yes White Light Immunity
RS Stock No. 851-2772
Mfr. Part No.602819
BrandSteinel
€124.05
Each
units
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RS Stock No. 796-2028
BrandRS PRO
€59.03
Each
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RS Stock No. 851-2766
Mfr. Part No.603113
BrandSteinel
€102.49
Each
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RS Stock No. 828-1042
Mfr. Part No.PIR700B-RS
BrandPowerLED
€24.90
Each
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RS Stock No. 796-2034
BrandRS PRO
€78.75
Each
units
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