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. 851-2766
Mfr. Part No.603113
BrandSteinel
TWD3,565.00
Each
units
- - - - - - - - - -
RS Stock No. 203-2218
Mfr. Part No.5WG1258-2DB12
BrandSiemens
TWD5,130.00
Each
units
- 4m - - 3000 mm - - - - -
RS Stock No. 206-8804
Mfr. Part No.4058075244771
BrandLEDVANCE
TWD2,094.00
Each
units
- - - - - - - - - -
RS Stock No. 796-2040
BrandRS PRO
TWD3,154.00
Each
units
- - - - - - - - - -
RS Stock No. 352-5007
Mfr. Part No.AMN14112
BrandPanasonic
TWD1,132.00
Each
units
PIR Motion Detector 10m - 17mm - - 18.5 mm NaPiOn - -
RS Stock No. 759-5697
Mfr. Part No.LRM 1080
TWD2,908.00
Each
units
- - - - - - - - - -
RS Stock No. 796-2025
BrandRS PRO
TWD2,735.00
Each
units
- - - - - - - - - -
New
RS Stock No. 218-6879
Mfr. Part No.B3SDSKSTIBIL
TWD14,113.00
Each (In a Pack of 10)
units
PIR Motion Detector 3m 3V Lithium 86.1mm 23.1 mm - - - - -
RS Stock No. 796-2028
BrandRS PRO
TWD2,219.00
Each
units
- - - - - - - - - -
RS Stock No. 193-8228
Mfr. Part No.4058075232969
BrandOsram
TWD7,015.00
Each
units
- - - - - - - - - -
RS Stock No. 424-0381
BrandRS PRO
TWD2,328.00
Each
units
- - - - - - - - - -
RS Stock No. 796-2015
BrandRS PRO
TWD1,859.00
Each
units
- - - - - - - - - -
RS Stock No. 851-2772
Mfr. Part No.602819
BrandSteinel
TWD4,314.00
Each
units
- - - - - - - - - -
RS Stock No. 647-8819
Mfr. Part No.BW8085
BrandABUS
TWD2,078.00
Each
units
PIR Motion Detector 13m - 135mm - - 27 mm XEVOX Yes -
RS Stock No. 176-8742
Mfr. Part No.4058075801462
BrandOsram
TWD10,241.00
Each
units
PIR Motion Detector - Not Included - - 400mm 255 mm ST8 RT - -
RS Stock No. 748-0804
Mfr. Part No.A86616
TWD3,795.00
Each
units
- - - - - - - - - -
RS Stock No. 190-1837
Mfr. Part No.SLW360N
TWD1,539.00
Each
units
- - - - - - - - - -
RS Stock No. 202-7614
Mfr. Part No.U054
BrandM5Stack
TWD78.00
Each
units
IR Detector 5m - - 20 mm 25mm 24 mm - - -
RS Stock No. 883-7853
Mfr. Part No.MDU1750CM-C920809
TWD420.00
Each
units
Motion Detector - - - 46 mm 37.75mm 13.1 mm MDU17 - High Sensitivity, Low Cost, Low Power Consumption, Patch Antenna, RoHS Compliant, Small and Flat Profile, Supervision Capability, +3.6 V to +5 V Versions Available
RS Stock No. 203-2234
Mfr. Part No.5WG1258-2EB22
BrandSiemens
TWD6,332.00
Each
units
- 4m - - 3000 mm - - - - -