Detailed installation method of infrared radiation
Installation of infrared through-beam detector
① Pillar type installation: There are two popular pillars, round and square. In the early days, circular cross-section pillars were more popular. Now the situation is just the other way round. Square pillars are becoming more and more popular in the engineering world. The main reason is that the detector is installed on a square pillar without rotation and difficult to move. In addition, it is also one of its advantages to have a wide choice of stainless steel, alloy and aluminum alloy profiles. Another method is to use angle steel as a pillar. If the wiring cannot be effectively covered by the pipe, the wiring will be exposed in the air. This method is not acceptable.
The shape of the pillar can be "1", "z" or curved, depending on the characteristics of the building and anti-theft requirements. The key point is that the pillar is firmly fixed without displacement or shaking to facilitate installation and fortification. Reduce false positives. ;
② Wall-mounted installation: Active infrared detector manufacturers at the forefront of technology in the anti-theft market can provide infrared detectors with a horizontal angle of 180 ° and a pitch above 20 °, such as aleph active infrared detectors ha, abt, abf series The product can support the direct installation of the probe on the building's outer wall or fence or fence.
General principles of infrared through-beam detector installation
The main function of the detector installed on the channel is to guard against illegal traffic. In order to prevent false alarms caused by pets and small animals, the position of the probe should generally be more than 50 m from the ground. The shading time should be adjusted to a faster position to respond quickly to illegal intrusions.
The main function of the detector installed on the fence is to prevent man-in-the-middle overturning. It can be installed on the top or side.
For detectors mounted on top, the position of the probe should be 25 m above the fence and the top of the fence to reduce false alarms caused by birds and kittens moving on the wall. The four-beam detector's anti-false alarm capability is stronger than that of the dual beam, which is stronger than the single beam.
The side installation is to install the probe on the fence, and the side of the fence near the top is generally used for wall installation, and it is mostly installed on the outside. This way can avoid the interference of birds and kittens.
Each method has its own advantages or disadvantages, and engineering companies have their own preference for each installation method. Users should choose according to the characteristics of their buildings and anti-theft requirements.
Special reminder for infrared installation
1. The line cannot be applied directly, and the pipe is concealed. This is the minimum requirement for the detector's workability.
2. The horizontal distance of the detector installed on the wall must not be greater than 30 m from the edge of the wall. This point requires special attention where the wall turns in an arc.
3． After the wiring is connected, please use the resistance of the multimeter to test the power terminals ① and ② of the probe, and make sure that there is no short-circuit fault before turning on the power for debugging.
Wiring method of infrared radiation
The power supply is connected according to the positive and negative polarity. You can regard all the alarm output parts of the wired detector as a switch. Generally there are 3 terminal blocks com (common) / nc (normally closed) / no (normally open). Com and nc are used to connect to the alarm input of the alarm host. If the alarm host has a tamper resistance, it must be connected to the detector. Do not connect to the end of the host, otherwise the tamper resistance will be lost.
The resistance of the wired alarm host is called "end-of-line resistance". As the name implies, it should be connected to the end of the line, that is, the detector. With anti-damage function, short circuit and open circuit will alarm. Do not directly connect to the host, otherwise, the manufacturer might as well solder on the circuit board. Many beginners make similar mistakes. Hope to attract attention.
Engineering debugging of infrared through-beam detector
(I) Adjustment of the optical axis of the projector
Open the cover of the probe, point the eye at the sight, and observe the effect in the sight. The optical lens of the probe can be adjusted by hand directly to the left and right within a range of 180 °. Use a screwdriver to adjust the up and down adjustment screws under the lens. The adjustment range of 12 ° is repeatedly adjusted so that the influence of the counterpart detector in the sight falls into the middle position.
Be careful not to cover the optical axis during the adjustment process, so as not to affect the adjustment work.
The adjustment of the optical axis of the projector has a great impact on the sensitivity performance of the zone. Please carefully and repeatedly adjust it according to the correct steps.
(Two) adjustment of the optical axis of the receiver
1: Perform the preliminary adjustment of the optical axis of the receiver in the same way as the "optical axis adjustment of the projector". At this time, the red warning indicator on the receiver is off, the green indicator is on, and there is no flicker, which indicates that the optical axis of the head is normal, and the emitter and receiver functions normally.
2: There are two small holes on the receiver, which are marked with "+" and "-" respectively, for testing the intensity of the infrared light felt by the receiver. Its value is expressed by the voltage, which is called the photosensitive voltage. Insert the test leads (red "+", black "-") of the multimeter into the photoreceptor voltage of the measuring receiver. Repeatedly adjust the lens system to achieve a large value of the photosensitive voltage. In this way, the working state of the probe has reached a good state.
Note: The four-beam detector has two sets of optical systems, which need to cover the upper and lower lenses of the receiver respectively and adjust until the upper and lower photosensitive voltages are consistent. The two optical systems of the older four-beam detector are adjusted separately. Due to the corresponding relationship between the four optical systems of the two probes of the transmitter and receiver, it is quite difficult to adjust, and it needs to be adjusted carefully. False positives or dead zone protection. The abf four-beam detector has integrated the two parts into one body for adjustment, making engineering construction much easier.
(Three) shading time adjustment
There is a shading time adjustment button on the receiver. Generally, the shading time of the probe is adjustable between 50m / s ~ 500m / s. When the probe is shipped from the factory, the shading time of the probe is adjusted to a standard position in the factory. Next, this position is a relatively moderate state, which takes into account the environmental conditions and the characteristics of the probe itself, so there is no special reason, and there is no need to adjust the shading time. If you need to adjust the shading time due to fortification reasons, to adapt to changes in the environment. Generally speaking, the shorter the light-shielding time, the faster the sensitivity of the probe, but the sensitivity to falling leaves, flying birds, etc. is also strong, increasing the possibility of false alarms. Long shading time reduces the sensitivity of the probe and increases the possibility of false negatives. The engineer should adjust the shading time according to the actual needs of the fortification.
Connection of infrared through-beam detector and alarm host
After the probe is set, connect the tamper switch to the input circuit of the zone. After the connection is completed, cover the probe's housing and tighten the fastening screws. It is required that the warning light of this zone on the anti-theft host computer is not flashing or lit, and there is no alarm indication output in the zone. Indicates that the entire zone is set normally. Otherwise, check the line, re-adjust the probe, and confirm the zone status again.
Performance test of infrared through-beam detector
After the working status of the defense zone is normal, according to the requirements of the fortification, all possible size and shape objects similar to the defense should be used to cover the optical axis of the probe at different speeds and in different ways. At the alarm site, use a radio to communicate with the control center. Check whether the alarm condition is normal, and pay attention to whether there is any flickering or unstable state on the alarm host. So as not to leave hidden dangers to the alarm system. We call this process verbally. The purpose of the firing test is to test whether the defense zone has the ability to alarm normally, to test whether the scope of the defense zone can meet the predetermined requirements, and whether there is a dead zone of protection.
Routine maintenance of infrared through-beam detector
In the daily work of the detector, because it has been working outdoors for a long time, it is unavoidably affected by the dust, microorganisms, snow, frost and fog in the atmosphere. For a long time, a layer of dust-like hard materials has often accumulated on the outer wall of the detector. In the shell, a thick layer of moss will grow in relatively humid places, and sometimes birds will also pull excrement onto the detector, which will hinder the emission and reception of infrared rays and cause false alarms. Therefore, to perform maintenance at regular intervals, usually one month or so dipped in detergent to clean the shell of each detector, and then wipe dry. In addition to cleaning the detector casing, a firing experiment is performed every other month to check the alarm performance of the anti-theft system.
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