subject: Introduction and maintenance of fire detector principle of cleaning - fire detectors, fire alarms - Fire Industry [print this page] Introduction and maintenance of fire detector principle of cleaning - fire detectors, fire alarms - Fire Industry
Fire Detector Operation Status Fire detector fire alarm system constitutes the core component of modern Fire Alarm And Automatic fire extinguishing An integral part of the system, it is good or bad working conditions will directly affect the normal operation of the disaster prevention system. Affected by environmental factors such as the accumulation of dust and oil, greatly reduced the reliability of fire detectors, causing false positive or false negative phenomena have occurred in urgent need of timely cleaning and maintenance.
But the current situation is, on the one hand, some of fire alarm system with "disease" to run, long-term lack of the necessary cleaning and maintenance service and maintenance, or even disable shutdown problem; the other hand, some units do not cleaning and waste treatment capacity, and no cleaning service qualification permit, but privately Lanhuo, barely cleaned, neither the necessary disassembly, cleaning maintenance equipment, and no checking of standard equipment, resulting in adverse consequences, interferes with the cleaning and maintenance market normal operation. This is based on the background, by the Ministry of Public Security jointly developed with the departments concerned, "Construction of automatic fire alarm system acceptance" of the state mandatory national standard specifications and standard installation issued by the Executive and other departments not only provides a unified scientific and reasonable technical standards and oversight for the public security fire department provides the technical basis for a standardized management. In the "construction of automatic fire alarm system acceptance" in Chapter IV Section III of fire detectors and testing and cleaning is expressly provides:
1, a quarterly test in stages with special detection equipment detectors to confirm the action and light show.
2, each with special detection equipment installed on the detector, should test one.
3, put into operation two years after fire detectors should be cleaned once every three years all, and for response thresholds and other necessary function tests, those who pass can continue to use, fail safety, No re-use.
Better life from the fire detector shows the need for cleaning and maintenance
According to data analysis, in the operation of fire detectors, such as not cleaning maintenance, the average life of only 5 years, but if its for regular cleaning maintenance, service life can be greatly extended.
China's largest manufacturer of automatic fire alarm system of 262 state-owned factory had FJ-2701 to do the detector volume, continuous operation test, based on this experimental data and by theoretical calculation, FJ-2701R, the average life expectancy ( MTBF) for 34 years, average life expectancy of bilateral area on the lower limit of 13 years and 125 years. According to the law in recent years a large number of systems analysis, a fire detector MTBF of 30 years or more in line with the current situation. Therefore, qualified by a cleaning unit of the regular cleaning of the fire detector maintenance is essential and very important. Remove dust or dirt have accumulated will be re-obtain the best detection results, if the dust and dirt part of the room surrounded by an ion detector smoke, smoke particles may not reach ionization chamber, it only becomes more sensitive detector is easy to produce false positives. Another example is the photoelectric detector, the accumulation of dust and oil will reduce the light intensity, so all kinds of light scattering detectors become less sensitive; and a variety of light attenuation detector will become more sensitive. For the flame detector will be due to the sensitivity of the lens of dust and dirt accumulation on the affected, all of which shows periodic cleaning is necessary. Regular cleaning and maintenance of fire detector, can extend its life. On the failure of fire detectors do not study the reasons, the replacement, there is no economy to speak of. With a crude means to repair the fault can cause a fire detector temporary illusion of normal recovery, the more serious hazards.
Fire detector principle and safeguard the principles of cleaning
Image of fire detectors can be compared to modern building fire protection system guards, automatic fire alarm system in normal operation, the "guards" on duty status can not be there? Silk burnout, little oversight and the effect will be to the whole system bring unimaginable consequences, leading to automatic alarm system to protect the whole building is destroyed in a "sick" and "guards" who.
