This Passive Infrared Sensor (PIR) from Labcraft detects the movement of body heat and can be used to control any load up to 4.5A (typically an LED light or lights). Whenever the PIR detects movement it triggers an internal relay, powering the connected devices for 30 seconds before automatically switching them off again. This makes it deal for installations where automatic lighting is required whenever someone walks into an area or enters a room, or for applications where you want to ensure that a light is not left on (to conserve battery power). With a depth of only 19mm, the low profile, robust design ensures it is unobtrusive and the risk of damage is minimised. Motion sensors are also used in the workplace for example to shut down equipment that could be dangerous if the worker gets too close. Red larger gauge cables (switched outputs)should be connected in-line between +12V power source and +12V input to the load Suitable for use with 12v systems as found in motorhomes, caravans, campervans, boats, horseboxes, 4x4s and commercial vehicles.

The PIR sensor has a low current consumption of 40mA (0.04A) so incurs minimal drain on the battery. The housing is made from aluminium with plastic end caps andis designed for surface mounting using 2 fixing holes. Electrical connection is via 4 flying leads on the rear of the unit as follows: This external 12v PIR motion sensor is ideal for mounting in the garden to control low voltage outdoor lighting systems. Sealed into an IP rated box, the sensor is waterproof and can be mounted onto any flat surface). A dip switch control box is located inside the box. This allows a number of settings to adjust easily. These include: a dusk to dawn setting which controls whether or not the sensor will work during daytime or only during darkness. Also, a low or high sensitive detection range, and various time delays from 5 seconds to 8 minutes. 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.