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Infrared beam installation detailed steps to share
Detailed installation method of infrared radiation
First, the installation of infrared through-beam detectors is more difficult than passive infrared detectors, but it is only slightly more complicated. But as long as you have sufficient understanding of the wiring method, location determination, and debugging, and proceed carefully with reference to the instructions, I believe there will be no problems.
The infrared through-beam detector is mainly composed of a protective cover, a mounting base, a tamper switch, an infrared transparent sheet, a circuit board, a boundary line base, an adjustment switch, and a housing, etc., which are not as complicated as imagined. Before installation, we can draw the installation position with a pencil or other tools according to the design drawing (or place the infrared radiation detector on the installation site to outline), and then use a spirit level or other tools to determine the installation position to ensure that Installation accuracy and aesthetics.
Installation of infrared through-beam detector
â‘ 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. It depends on the characteristics of the building and anti-theft requirements. The key point is that the pillar must be fixed firmly without displacement or shaking to facilitate installation and installation. Fortify and reduce false positives. ;
② Wall-mounted installation: Nowadays, manufacturers of active infrared detectors that are at the forefront of technology in the anti-theft market are able to provide infrared detectors with horizontal 180 ° quan azimuth rotation angle and tilt angles above 20 °, such as aleph active infrared detectors ha, abt, The abf series of products can support the direct installation of the probe on the building's outer wall, 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 must not be applied directly, and it must be hidden through the pipe. This is the minimum requirement for the safety of the detector.
2. The maximum horizontal distance of the detector installed on the fence wall from the edge of the wall cannot be greater than 30 m. This point needs special attention in the place where the fence bends in an arc.
3. After the wiring is connected, please use the resistance of the multimeter to test the power terminals â‘ and â‘¡ 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). We often 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, not 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
(1) Adjusting 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 central 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 be sure to carefully and repeatedly follow the correct steps.
(Two) adjustment of the optical axis of the receiver
Step 1: Perform the preliminary adjustment of the optical axis of the receiver according to the same method as "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.
Step 2: There are two small holes on the receiver, which are marked with "+" and "-" respectively. It is used to test the intensity of the infrared light felt by the receiver. Its value is expressed by voltage, which is called 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 reach the maximum 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 walkie-talkie and 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, maintenance must be carried out at regular intervals, usually one month or so, soaked in cleaning agents to clean the casing of each detector, and then wiped 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.