False alarms caused by improper construction

This is part of the problem lies in the following areas: (1) there is no strict accordance with the design requirements of the construction. (2) the device is not securely installed or inclination inappropriate. (3) Weld joints, burr, or shielding measures shall not be treated. Sensitivity (4) adjustment device poor. (5) Construction equipment does not comply with the detection measurement requirements. To solve the problem is to strengthen the supervision and management of the construction process, the implementation of the security engineering supervision system as soon as possible, which is very beneficial to improve project quality and reduce false alarms caused due to construction sectors.

False alarms caused by equipment failure alarm

Product under specified conditions, within a predetermined period of time, can not complete the required function, is called fault. Type of fault damage failure and drift fault. Damaging failures include performance of all failures and catastrophic failure. Such failure is usually caused by damage or poor production process components (such as Weld, etc.) cause. Drift refers to the parameters and failure of the power supply voltage drift components caused by the fault. For example: the temperature is too high will result in a change in resistance, the device performance is too good and bad this time. In fact, the ambient temperature, component manufacturing processes, equipment manufacturing processes, use of time, storage time and power load and other factors could lead to changes in component parameter drift failures.

Whether it is damaging fault or failure will cause the system drift false alarms, to reduce false alarms resulting from the following efforts.

(1) Alarm equipment manufacturing enterprises, the need to improve the design level and the level of technology products, at the same time as the system design, the need for reliability design, such as redundant design, electromagnetic compatibility design, three anti-design (moisture, salt fog, anti-fungal), drift reliability design. On this basis, to improve the reliability of the product manufacturing process, such as the quality of the components of a rigorous screening; the production process and strict quality supervision and management to ensure product quality in line with the relevant standards. Alarm equipment sales units or individuals, should be strict incoming inspection, test content is: a quality product inspection certificate; manufacturers of industrial production license or safety certificate or production registered ratification.

(2) Management should check regularly or irregularly organized security market, spot checks found that the production and sale of security products in illegal activities should be strictly in accordance with the provisions of "security technology to prevent product management approach" treatment.

(3) the alarm system construction unit (user) should be explicitly requested in the corresponding project file selection and construction units authorized testing laboratories qualified products; import of foreign equipment to choose informal channels, according to the international advanced standard test qualified products.

(4) In order to ensure good working condition and alarm system, must establish a regular inspection and maintenance system. Incidentally, the current maintenance mode of the alarm system to be solved, it is best variant maintenance engineering construction unit for maintenance professional maintenance company, so not only conducive to the maintenance of resources (maintenance personnel, equipment maintenance, spare parts for maintenance, etc.) and use improve service levels, more importantly, to improve the security system reliability.

False alarms caused by improper system design

Equipment selection is the key to the system design, and a wide range of alarm equipment, and they all have their own characteristics, scope and limitations of the improper selection can cause false alarms. For example, near the epicenter (airport, next to the railway) it is easy to choose the vibration detector false alarms caused by the system; in places frequented bat ultrasound probe has chosen to make the system of false alarms, it is because bats emit ultrasonic sake; electric ringtones, metal percussion and other high-frequency sound can cause a single technology glass break detector false alarm ......, therefore, to reduce the false alarms caused by improper equipment selection, system designers should be very familiar with the various alarm equipment principles, characteristics, Scope and limitations. It also must master site environmental conditions, weather conditions, electromagnetic field strength and illumination change, in order to select the alarm equipment to local conditions.

In addition to equipment, equipment selection addition, the system is also reflected in poorly designed equipment, equipment installation location, installation angle, protective measures and other aspects of the system wiring. For example: the passive infrared intrusion detectors facing the air conditioning, when the fan is installed, it will cause false alarms system; active infrared detectors for outdoor use if you do not make the appropriate shade of protection (with sunshield best also for protection), bound false alarms caused by the system; when the alarm circuit and power lines, lighting lines, and strong electric line spacing of less than 1.5m, while that measure electromagnetic interference, the system will generate false alarms.

Environmental nuisance caused by false alarms

Due to false alarms caused by environmental nuisance alarm system refers produce under normal operating conditions, in principle is inevitable, but the fact they are not needed, are false alarms. For example: false alarms caused by hot air passive infrared intrusion detectors; high frequency noise caused by single-technology glass break detector false alarm; ultrasonic source of false alarm caused by the ultrasound probe. Reduce such false alarms are more effective measure is to adopt Shuangjian detector (two different principles detector to simultaneously detect the "target", the alarm before the alarm signal). The current products are: Microwave - PIR Shuangjian, a voice - broken glass Shuangjian vibration, ultrasonic - passive infrared Shuangjian like. But some environmental nuisance Shuangjian detector powerless, for example: in the prevention area infested mice; pet walk around the room and so on. For this reason, scientists turn to introduce micro-processing technology alarm system, it has a certain degree of identification and the ability to think, to a certain extent determine the intruder alarm or environmental nuisance caused. In summary, the false alarm and burglar alarm, factors outside the detector itself, but also has a great relationship with the wiring installation and construction, and the surrounding environment, and changes in the environment, such as noise, stable, air, etc. are often unable to solve , so choose a product has immunity is the key.