ACTIVE INFRARED PERIMETER SENSOR
Perimeter sensors use infrared (IR), passive infrared (PIR) or light-detecting sensors to monitor your surrounding property. When movement is detected by these sensors, they can send notifications to your alarms or security system so you instantly know when someone is approaching.
An infrared (IR) sensor is an electronic device that measures and detects infrared radiation in its surrounding environment. Active infrared sensors both emit and detect infrared radiation. Active IR sensors have two parts: a light emitting diode (LED) and a receiver.
Active Infrared (IR) Fence Detectors, or Photoelectric Infrared Fence Sensors have been widely used in perimeter security systems. Unlike the electric fence, the Active Infrared fence detectors utilize invisible Infrared barriers to detect the intrusion. It has long detection/guarding range, low-cost, high-quality, and installation-friendly features. Some IR fence detectors adopt 4-channel frequency design to avoid IR interference between different beams, this can greatly reduce the false alarm rate to offer you accurate motion detection.
Some Active IR Fence Detector product portfolio includes 2∼10 beams, and detection range reaches up to 5m∼40m. These photoelectric fence sensors have N.O. and N.C. alarm output, can work with difference systems through reliable wired connection. It's the ideal security detectors for your intrusion alarm system, access control system, IP surveillance system and home automation system.
1# How active infrared fence detector works?
Each
Active Infrared (AIR) sensor comes as a pair, consisting of a transmitter and
receiver. IR transmitter emits multiple Infrared light to the receiver, this is
the working principle of AIR sensors. The transmitter and receiver are
installed opposite each other, the area between the transmitter and received
has been guarded by invisible IR-beams. When a person or object crosses the
IR-beam, the infrared beam is interrupted. The receiver triggers alarm and send
alarm signals.
AIR
fence detectors use an active infrared technique, it provides much accurate
motion detection than PIR-based detectors. Additionally, the fence sensors use
the pulsating code to filter out interference light sources from sunlight,car
headlights and lightning flashes. The fence receiver only reacts to
interruptions in this pulsating infrared beam, other light sources therefore do
not affect the receiver. Our active Infrared fence detectors emit IR in 4
different frequencies to make it difficult to be replicated and interfered.
2# How to choose right AIR fence detectors?
To
choose the right active infrared fence detectors, you need to consider the
following two things; the number of beams, the detection range. Most active
infrared beam detectors have 2, 3, 4, 6, 8, 10 beams. The more the number of
beams, the higher of the detector's height. Typically, 2∼4 beams
fence detectors are suitable for covering single window and door. 6∼10
beams AIR fence detectors fit the application of balconies and windows and
doors in the array.
Active Infrared Fence
Detector Installation 1
AIR Fence Detector
Installation 2
Detection coverage/range is the another very important factor when choosing the detector. Unlike other detectors, the installation distance between the transmitter and receiver should be the exact/approximate same rated detection distance of Active Infrared fence detectors. This means if the detection range is 20 meters, users need to choose 20 meter Active IR fence detector, not the 40 meters product. However, the Active IR detectors allow users to adjust the intensity of Infrared light to change the detection distance.
3# How to connect the AIR fence detector?
Both IR transmitter and receiver requires power supply (10.5
- 15V DC) to operate. However, sync connection maybe required for the long range
detection. When connecting the AIR fence detector to alarm systems, EOL
resistor (2.2Kohm) connection is mandatory to supervise the circuit.
Note: In order to avoid false alarm caused by power
failure/electricity outage, it's recommended to use UPS power supply.
Note: If the controller is an alarm panel, EOL resistor (R1) should be used, it should be connected in series to protect and supervise the circuit. Other controllers don't need to use EOL resistors.