【 Weak current College 】 fire detector description and analysis of cleaning and maintenance

Fire detector operating status

Fire detector is an automatic fire alarm system of the core components of modern fire alarm and automatic fire extinguishing system is an integral part of the work situation, it will have a direct impact on the whole good disaster prevention system's normal operation. Affected by environmental influences the accumulation of dirt and grease, fire detectors of reliability greatly reduced, causing a false positive or false negative happens from time to time, urgent and timely cleaning and maintenance.

But the current situation is, on the one hand, some automatic fire alarm systems in the band "disease" running long-term were not necessary cleaning and maintenance, maintenance, and even shutdown disabled issues; on the other hand, there is no cleaning and waste disposal capacity, cleaning and maintenance qualification license, but secretly lanhuo, reluctantly cleaning, neither necessary for disassembly, cleaning and maintenance equipment, no checking of standard instruments, causing adverse effects that interfere with the normal cleaning maintenance market. It is with this background, the Ministry of public security with the relevant departments to jointly developed the automatic fire alarm system construction and acceptance of the specification is part of the compulsory national norms, normative implementation not only of the enacting State to be installed using sectors provides a nationally consistent scientific and reasonable technical standards, as well as public security Fire Department provides a standardized management of technology. In the automatic fire alarm system construction acceptance ", Chapter 4, section III on fire detector inspection and testing as well as the cleaning done explicitly:

1, quarterly using special instrumentation test batches and confirmation of motion detector light show.

2. each year by a dedicated testing instruments for the installation of detectors, you should test it again.

3. fire detectors put into operation two years later, every three years all cleaning again, and repeat response thresholds and other necessary functions test, candidates may continue to use the unqualified persons is strictly forbidden to use Ontario.

From fire detectors of life is better able to explain the need for cleaning and maintenance

According to data analysis, operation of fire detectors, such as not for cleaning and maintenance, average life 5 years or so, but if it is a periodic cleaning and maintenance, the service life can be greatly extended.

China's largest automatic fire alarm system manufacturer-owned 262 plant had to do FJ-2701-fire detectors in batch, continuous operation tests, which are based on experimental data and theoretical calculations, the average life expectancy of FJ-2701R (MTBF) for 34 years, average life expectancy of bilateral area and upper limits for 13 years and 125 years. According to the last few years a lot of system rules, a fire detector MTBF is 30 years or more in line with the current realities. Therefore, qualified by a cleaning unit for fire detectors for periodic cleaning and maintenance is essential and very important. To clear the accumulation of dust or dirt will regain the best sounding effect, if the dust and dirt section surrounded by a Ion Detector smoke Chamber, the smoke particles may not reach the ionization chamber, this detector becomes more sensitive and prone to produce false positives. Another example of photoelectric detector, dust and greasy dirt accumulation will reduce the intensity of light, and various light scattering detector will become less sensitive; and various optical attenuation type probe will become more sensitive. For flame Detector sensitivity is also due to the lens on the accumulation of dust and dirt and affected, all this shows that regular cleaning is necessary. Periodically to make cleaning and maintenance of fire detector, can extend its life. On the failed fire detectors, impunity for replacement, no economy at all. With poor means to fix can only lead to failure of fire detectors at the illusion of normal recovery, their vulnerability.

Fire detector working principle and the principle of cleaning and maintenance
　　　　　　　　　　　
Fire detector can image compared to modern fire protection system Sentinel, in automatic fire alarm system functioning State, "the Sentinel" enforcing State cannot have — wire Burnout, slightly negligent and careless will bring to the entire system of unimaginable evil, eventually leading to the alarm system by defending the whole building is destroyed in a "sick" and "the Sentinel".

A day of intense work, regular medical check-up, the early detection of disease and treatment, the higher the quality of the work of vote again, this work will be: practices of recognition, by the same token a fire detector from the production plant, which is installed in the "Sentinel" posts, start a long-term process of the "service". According to market research results, online running detector, the earliest dating back to 1980, his "old, weak, sick," is not difficult to imagine that the Ministry of public security, July 93 implementation (automatic fire alarm system construction acceptance) expressly provided on the probes for the "health check" of the cycle and the "standard treatment", such practices, it is for the proper guidance and scientific norms of automatic fire alarm system of the user running fire defense system, ensuring national and collective property.

Fire detector why regular cleaning and maintenance, and testing calibration? this from fire detector works and design structure two angles. Fire detectors are sensor family in a special branch, now with more smoke sensor (ion sensing smoke-and photoelectric smoke-two categories), infrared sensitive sensor and temperature sensors. Where smoke sensor application number, the most widely used applications, accounting for about 90% above the ratio in our be likened to the "Sentinel force" of the main composition.