Many false alarms will be caused by the placement of the alarm and sensors rather than the cost or quality of the alarm. This means that when installing wireless motion detector alarms, you should arrange them in places that maximise their efficiency while minimising false warnings. item specification -- distance: 2~12 meters (adjustable); detection angle: ≤160°; time-delay: 5sec~10min(adjustable); recommended installation height: 1.5~4m. wire connection instruction: brown wire: live input, red wire: live output, blue wire: common neutral. motion sensor outdoor -- the pir sensor adopts infrared body motion induction technology, which can achieve intelligent control and energy saving. recommended that the product is installed by professional electrician. PIR-based motion detector edit A PIR motion detector used to control an outdoor, automatic light. A camera trap with PIR motion detector. An indoor light switch equipped with PIR-based occupancy sensor [1]

Common installation locations include ceiling or wall mounting as these tend to provide a clear, unimpeded view of the detection area. They may also be installed alongside wall lights, for example, in automatic lighting applications. PIR sensors are great at determining if you have an intruder or it’s just an animal, for example. They have a better accuracy level and can reduce false alarms overall. However, you should pay attention to some small details to further reduce the risk of false alarms from your PIR motion sensors.

Please note:

The PIR sensor is typically mounted on a printed circuit board containing the necessary electronics required to interpret the signals from the sensor itself. The complete assembly is usually contained within a housing, mounted in a location where the sensor can cover the area to be monitored. Avoid installing sensors near radiators and air vents, for example, as temperature changes could impact reliability or result in a false alarm The plastic window covering may have multiple facets molded into it, to focus the infrared energy onto the sensor. Each individual facet is a Fresnel lens. It is also recommended that the PIR not be placed in such a position that an HVAC vent would blow hot or cold air onto the surface of the plastic which covers the housing's window. Although air has very low emissivity (emits very small amounts of infrared energy), the air blowing on the plastic window cover could change the plastic's temperature enough to trigger a false alarm.

Designs have been implemented in which a PIR circuit measures the temperature of a remote object. [6] In such a circuit, a non-differential PIR output is used. The output signal is evaluated according to a calibration for the IR spectrum of a specific type of matter to be observed. By this means, relatively accurate and precise temperature measurements may be obtained remotely. Without calibration to the type of material being observed, a PIR thermometer device is able to measure changes in IR emission which correspond directly to temperature changes, but the actual temperature values cannot be calculated. Once the PIR sensor detects movement an alert is sent to the alarm panel which activates the alarm. It is critical to completely enclose the PIR sensor itself with a material that can reduce the effects of external temperature and humidity, such as metals like silicon. The benefits of PIR Sensors are also often designed to "ignore" domestic pets, such as dogs or cats, by setting a higher sensitivity threshold, or by ensuring that the floor of the room remains out of focus. Manufacturers recommend careful placement of their products to prevent false alarms (i.e., any detection not caused by an intruder). One of the most successful to date is the PIR sensor method found in many of the burglar alarm systems installed in domestic and commercial properties alike. But what is a PIR Sensor? And what makes them so effective? What is a PIR Sensor?A PIR-based motion detector is used to sense movement of people, animals, or other objects. They are commonly used in burglar alarms and automatically activated lighting systems.

PIR sensor-based alarms can be designed to ignore certain shapes of moving objects, or only detect motion above a certain height. This makes them suitable for households that have pets, allowing you to set the alarm before leaving the house in the day without worrying that it will be triggered by your cat or dog moving about. A passive infrared sensor detects the infrared light emitted by a warm object using passive infrared technology.Simple things like air blowing in close proximity or a rodent moving across the floor can still set off your alarm.