The principle and installation of the anti-theft alarm detector

A perfect anti-theft alarm system, in terms of function realization and system stability, the key depends on the performance of the detector installed at the front end and stable operation. In addition to the system function, the most important two indicators of burglar alarm are false positives and false negatives. These two indicators are contradictory and unified, which is the most important factor in distinguishing the quality and grade of different brand products.

A high-end brand and excellent products must be able to achieve low false positive rate and low false negative rate, otherwise they cannot be called high-end products. We believe that many users in China are not fully aware of this. How to achieve rational consumption, use a scientific and reasonable point of view to understand a brand, a product, and then we talk about our own views. The so-called: open the window to say bright words, open the mouth and say stuffing.

1. Analysis of the composition and principle of the detector

There are a wide variety of detectors, including indoor passive detectors, outdoor passive detectors, outdoor active detectors and various environmental detectors. Environmental detectors are commonly found in vibration detectors, smoke detectors, gas leak detectors, as well as high-power detectors, harmful gas detectors, pressure and temperature detectors, and so on.

The working principle of the detector is nothing more than signal acquisition, signal processing and signal output. These three links are crucial to determining the quality of the detector. An erroneous acquisition signal necessarily leads to an erroneous input of the signal, which causes inaccuracies in the processing of the signal, which in turn produces an erroneous output. Some users may focus on indicators on the one hand when selecting detectors, such as paying attention to false positives but neglecting false negatives. Factors that lead to erroneous input include: whether the detector housing is properly designed, whether a high-quality infrared sensor head (pyrothermal sensor) is used, whether professional optical lenses are used according to design requirements, whether the detector has an environmental recognition capability, etc. . In short, it is important to understand and identify good products correctly and to make rational choices and consumption.

2. How to properly install and use the detector? What should I pay attention to?

There are some basic principles for the installation and use of detectors. Proper use and installation of detectors maximizes product design and reduces false positives. These principles and considerations include:

First, choose the detector that best suits the detection function.

According to the detector's signal detection and capture mode, it is divided into dual detector and infrared detector (single). As a professional manufacturer, we define a dual detector that is a detector that includes infrared detection and microwave detection. Whether it is unit infrared, dual infrared or quaternary infrared, this is a way, and microwave is another way. At present, some unprofessional manufacturers have launched so-called three-meter and four-detection detectors, which is an unscientific statement. In fact, the so-called "jian" is the meaning of identification and identification. There are only two ways for the detector to capture the signal: microwave recognition and infrared recognition. Some products refer to the processing methods of signals such as micro-processing and pet-proofing as "Jian", and the so-called three-detector and four-detection detectors appear. Our company has an AM series of products, including dual infrared, microwave detection, anti-blocking, anti-pet, and micro-processing technology, then can it be called "six detectors"?

As a general household use, we recommend the use of infrared detectors, supplemented by dual detectors. As a place for commercial use, such as companies, factories, shopping malls, military, schools, banks, government agencies, etc., we recommend the use of dual detectors, supplemented by infrared detectors. Anti-blocking detectors are suitable for high-risk locations, such as vaults, grabs, ammunition depots, etc., but are not recommended for use in other applications.

Second, choose a detector with the proper installation.

From the installation method, the detector is divided into wall-mounted and ceiling-mounted detectors, which are referred to as wall-mounted detectors and ceiling detectors.

The wall-mounted detectors are generally between 1.8 and 2.5 meters in height, and the detection range is 8 meters, 10 meters, 12 meters, 15 meters and 25 meters, which is suitable for use in places where the installation height is not large. For example, if the height of the room is less than 2.5 meters, the wall detector is better than the ceiling detector.

The ceiling detectors are available in both 4.0 and 6.0 meters, which is actually the maximum installation height of the ceiling detector. Since the detection range of the ceiling detector is a positive cone shape, the larger the installation height, the larger the detection range. We recommend that ceiling detectors be most suitable for use in locations with large spaces. Such as shopping malls, museums, villas, warehouses, libraries, confidential rooms, business halls, etc. Another major reason for the use of ceiling detectors in these locations is that there are numerous cargo storage racks on the site. If wall mount detectors are installed from the side, there are bound to be many dead spots due to the barrier of the shelves. The ceiling detector solves this problem well because it is detected and guarded at the top.

In the double-deck space of the villa, due to the relatively large space, two-story windows are generally designed. It is very suitable to hold this "position" with a ceiling detector with a mounting height of 6.0 meters.

Third, choose a detector that reasonably detects the space.

As mentioned above, the detection range and detection space of different types of detectors are different, and the detector can also be distinguished from the space detection range and the curtain detection range.

For example, for home users, it is sufficient to use the detection range of 8 meters, 10 meters, and 12 meters. It is not necessary to use a detector with a longer detection distance to avoid waste. School classrooms, teaching and research rooms, laboratories, etc. should normally use wall-mounted detectors with a detection range of 15 meters and 25 meters.

It is not necessary for home users to use a detector with a lower window, but for other users we recommend using a detector with a lower window. The definition of the professional under the window is called "downward defense zone", which can guarantee the blind zone without detection and prevention under the detector. When the home is used, there will always be a solid wall below the detector, but other users will be different. The correct use of the detector can guarantee a foolproof.

The curtain detector has its own characteristics, which are divided into two types: directional characteristic led display (recognition) and non-directional characteristics. We recommend that space detectors and curtain detectors be considered in the design. Reasonable design and supporting use can be more convenient for users to ensure the perfect embodiment of safety and prevention functions. In the case of home users, the anti-theft alarm system of Shenzhen Huiyi has the function of guarding the arm, that is, the system is armed in the case of someone at home. Properly equipped with curtains and space detectors, it can guarantee the prevention without affecting the normal activities of the family.

Fourth, the correct installation height and position.

The installation height and position of the detector require a common side and a personal side. Proper installation location and height maximize protection against false positives and false negatives.

Common aspects:

The installation height of the wall-mounted detector is between 1.8-2.5 meters, and the ceiling detector is used when the installation height is greater than 4.0 meters;

Avoid occlusions, such as mounting on the side of the door, rather than on the side of the hinge (back door). At the same time, avoid other obstacles, such as decorations, etc.;

Avoid direct interference from heat sources, such as not being able to face air conditioners and fans at close range, and not installing them above the heaters;

Wireless products also need to consider other electromagnetic interference;

Choose a dry and clean location to avoid flooding;

To fully consider the convenience of wiring and thrifty led electronic display, reduce the use of cables and holes in the wall;

The detector is to be mounted vertically and at an angle of 45° to the wall;

The detector's detection range should take into account all entrances and exits, and should not face all the entrances and exits;

Fully use the anti-shear function of the detector to properly connect the power supply, alarm output and anti-shear output port;

Try to use the mounting bracket for easy adjustment and maintenance, and ensure that it is uniform.

Personality:?

The anti-pet detector should be rigorously in accordance with the instructions of each model. The normal installation height is 1.8 meters, and the model of the anti-pet detector should be correctly selected according to the weight and size of the pet;

When installing the curtain detector, pay attention to the effect of similar curtains, and pay attention to adjusting the direction of the curtain;

Anti-blocking detectors should be used in high-risk situations;

Channel detectors should be used in the corridor.

Fifth, pay attention to false positives and false negatives.

False positives and false negatives are called double-edged swords in detector performance indicators, and are the two most important indicators for verifying that detectors are excellent. We believe that an excellent brand, an excellent detector, manufacturers must be able to solve the problem of false positives and false negatives perfectly. Improve sensitivity and solve underreporting Many manufacturers know how to do it, but they will bring the risk of false positives. Some manufacturers with weak technical strength have made a fuss about sensitivity. Everyone knows that false positives are easy to find and detect, and false negatives are not easily discovered by customers - stealing does not happen frequently. How to do? Reduce sensitivity. Is this a good idea?

Safety lies in prevention, raising soldiers for a thousand days, focusing on the use of soldiers for a while, the key moments can not be used, is the anti-theft system used for decoration?

3. What are the factors in the false alarm of the detector? Should it be solved?

I have already talked about this issue more or less in the previous content, and here are some additional additions and summaries. The false positives of the detector come from several aspects:

First, the design of the product, including signal capture and signal processing;

Second, the selection and production process of raw materials;

Third, the correct installation and use of the reversing radar, including the correct power supply.

As for the solution, it depends on how the industry colleagues face the above three aspects. The benevolent sees the benevolence, the wise sees the wisdom, and here is not described one by one.