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庫存編號 519-400
製造零件編號LS1020
BrandABUS
HK$473.09
整套:1 個
Set(s)
IR Detector 20m - - 34 mm 46mm 95 mm Ecoline Yes -
RS庫存編號 519-484
製造零件編號LS2030
BrandABUS
HK$912.36
整套:1 個
Set(s)
IR Detector 30 m, 60 m - - 72 mm 173mm 74 mm Profiline Yes -
RS庫存編號 524-5040
製造零件編號FU7300W
BrandABUS
HK$153.62
單位
Glass Break Detector 2m - - 9 mm 18mm 18 mm Ecoline - -
RS庫存編號 524-5090
製造零件編號BW8080
BrandABUS
HK$748.57
單位
PIR Motion/Microwave Detector 12m - - 48 mm 60mm 107 mm XEVOX Yes Creep Zone, Pet Immunity
RS庫存編號 519-494
製造零件編號LS2060
BrandABUS
HK$1,207.36
整套:1 個
Set(s)
IR Detector 60 m, 120 m - - 72 mm 173mm 74 mm Profiline Yes -
RS庫存編號 524-5321
製造零件編號BW8010
BrandABUS
HK$323.59
單位
PIR Motion Detector 15m - - 48 mm 60mm 107 mm XEVOX Yes White Light Immunity
RS庫存編號 524-4930
製造零件編號BW8000
BrandABUS
HK$222.18
單位
PIR Motion Detector 15m - - 47 mm 60mm 106 mm XEVOX Yes HF Immunity, Look-Down Lens Protection
RS庫存編號 524-5107
製造零件編號BW8070
BrandABUS
HK$556.92
單位
PIR Motion Detector 12m - - 48 mm 60mm 107 mm XEVOX Yes Creep Zone, Pet Immunity
RS庫存編號 524-5113
製造零件編號BW8040
BrandABUS
HK$948.33
單位
PIR Motion/Microwave Detector 15m - - 48 mm 60mm 107 mm XEVOX Yes White Light Immunity
RS庫存編號 647-8819
製造零件編號BW8085
BrandABUS
HK$556.92
單位
PIR Motion Detector 13m - 135mm - - 27 mm XEVOX Yes -
RS庫存編號 524-5141
製造零件編號BW8020
BrandABUS
HK$570.00
單位
PIR Motion Detector 15m - - 48 mm 60mm 107 mm XEVOX Yes White Light Immunity
RS庫存編號 519-444
製造零件編號LS2120
BrandABUS
HK$1,729.14
整套:1 個
Set(s)
IR Detector 120 m, 240 m - - 72 mm 173mm 74 mm Profiline Yes -
RS庫存編號 524-5517
製造零件編號BW8030
BrandABUS
HK$762.99
單位
PIR Motion/Microwave Detector 15m - - 48 mm 60mm 107 mm XEVOX Yes White Light Immunity