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
SGD19.41
Each
units
- - - - - - - - - -
RS Stock No. 524-4930
Mfr. Part No.BW8000
BrandABUS
SGD36.31
Each
units
PIR Motion Detector 15m - - 47 mm 60mm 106 mm XEVOX Yes HF Immunity, Look-Down Lens Protection
RS Stock No. 766-0094
Mfr. Part No.MLSA360N
SGD77.85
Each
units
- - - - - - - - - -
RS Stock No. 519-400
Mfr. Part No.LS1020
BrandABUS
SGD78.76
1 Set
Set(s)
IR Detector 20m - - 34 mm 46mm 95 mm Ecoline Yes -
RS Stock No. 883-7869
Mfr. Part No.MDU2000-C930802
SGD15.16
Each
units
Motion Detector - - - 27 mm 17.6mm 8.24 mm MDU20 - High Sensitivity, Low Cost, Low Power Consumption, Patch Antenna, RoHS Compliant, Small and Flat Profile
RS Stock No. 524-5090
Mfr. Part No.BW8080
BrandABUS
SGD128.14
Each
units
PIR Motion/Microwave Detector 12m - - 48 mm 60mm 107 mm XEVOX Yes Creep Zone, Pet Immunity
RS Stock No. 524-5517
Mfr. Part No.BW8030
BrandABUS
SGD130.61
Each
units
PIR Motion/Microwave Detector 15m - - 48 mm 60mm 107 mm XEVOX Yes White Light Immunity
RS Stock No. 327-7326
Mfr. Part No.AMN11112
BrandPanasonic
SGD32.15
Each
units
PIR Motion Detector 5m - 11mm - - 14.5 mm NaPiOn - -
RS Stock No. 827-2717
Mfr. Part No.0 488 07
BrandLegrand
SGD258.01
Each
units
- - - - - - - - - -
RS Stock No. 759-5693
Mfr. Part No.LRM 1070
SGD102.74
Each
units
- - - - - - - - - -
RS Stock No. 777-7750
Mfr. Part No.6800-0-2564 6868-35-500
BrandABB
SGD27.16
Each
units
- - - - - - - - - -
RS Stock No. 519-484
Mfr. Part No.LS2030
BrandABUS
SGD156.18
1 Set
Set(s)
IR Detector 30 m, 60 m - - 72 mm 173mm 74 mm Profiline Yes -
RS Stock No. 828-1046
Mfr. Part No.PIR700W-RS
BrandPowerLED
SGD40.50
Each
units
- - - - - - - - - -
RS Stock No. 352-5007
Mfr. Part No.AMN14112
BrandPanasonic
SGD56.33
Each
units
PIR Motion Detector 10m - 17mm - - 18.5 mm NaPiOn - -
RS Stock No. 524-5107
Mfr. Part No.BW8070
BrandABUS
SGD95.33
Each
units
PIR Motion Detector 12m - - 48 mm 60mm 107 mm XEVOX Yes Creep Zone, Pet Immunity
RS Stock No. 327-7348
Mfr. Part No.AMN12112
BrandPanasonic
SGD35.09
Each
units
PIR Motion Detector 2m - 12.7mm - - 15.2 mm NaPiOn - -
RS Stock No. 851-2790
Mfr. Part No.SensIQ S Evo BLK
BrandSteinel
SGD249.46
Each
units
- - - - - - - - - -
RS Stock No. 883-7866
Mfr. Part No.MDU2000-C930801
SGD19.29
Each
units
Motion Detector - - - 27 mm 17.6mm 8.24 mm MDU20 - High Sensitivity, Low Cost, Low Power Consumption, Patch Antenna, RoHS Compliant, Small and Flat Profile
RS Stock No. 424-0381
BrandRS PRO
SGD107.16
Each
units
- - - - - - - - - -
RS Stock No. 796-2047
BrandRS PRO
SGD186.46
Each
units
- - - - - - - - - -