To make a stand-alone photo-electric smoke fire detector alarm work You must also pay attention to the following: Choose a reasonable installation location The installation position of the independent photo-electricity smoke fire detection alarm has a great influence on the use effect. Generally, the room geometry, the size and height of the room, and the direction of gas flow in the room should be considered. The following are installation suggestions: The independent photoelectric photoelectric smoke detection alarm should be installed at the top of the room and should be centered; the horizontal distance to the wall and beam side should not be less than 0.5m and there should be no obstruction within 0.5m around it; to the fan and air conditioner The horizontal distance between the tuyere and the window side should not be less than 1.5m. The following environments are not suitable for installing independent photoelectric smoke detectors. Such as: places where steam and oil mist may occur, such as kitchens; places with water mist retention, such as bathrooms; places with a lot of dust; places where smoke is normally trapped. Regular inspection and maintenance Regular inspection and maintenance are required to ensure the performance of the stand-alone photo-electric smoke detector. In general, users should test at least once a month. It can be tested by pressing the “Test†button on the independent smoke detection alarm or using a professional smoking device. It is not recommended to use real fireworks for testing, because there are a large amount of combustibles in the bedroom or warehouse. It is easy to cause an accidental fire. The insect-proof net of the independent photoelectric smoke detector can prevent small insects and large particles of dust from entering the photoelectric labyrinth, but tiny dust entering the labyrinth is inevitable. A large amount of dust accumulation can cause scattering of emitted light and increase false alarms. Risk; accumulation of dust to the insect net will delay the flow of air, affecting the entry of smoke and increasing the risk of underreporting; therefore, regular cleaning is necessary. In the case of not disassembling the independent photo-electric smoke detector, you can use a hair dryer to blow off dust or use a vacuum cleaner to remove dust. If it can be internally dusted for removal, the effect is better. Generally, cleaning should be done once a year. Replace the battery in time According to the requirements of GB20517, the battery of the independent smoke detection alarm should be used for at least one year. However, if you test or alarm frequently, the battery life will be shortened. When it emits a low voltage alarm, it will usually sound every minute (see the instruction manual for specific products), in which case the battery should be replaced in time. In particular, be careful not to forget to install a new battery after removing the battery, otherwise the independent smoke detector will not work. According to the Smoke Alarms in US Home Fires report issued by the American Fire Protection Association [6], in the household fires counted from 2003 to 2006, the independent smoke detectors were installed but the main reason was that they were not powered. Missing or battery not connected accounted for 53%, battery is invalid or unable to provide power accounted for 22%. Using high-energy or lithium batteries can reduce the frequency of battery replacement, such as 3 or 5 years, but the cost of these batteries will be higher. Correct understanding of false positives and false negatives False positives refer to the fact that there is no fire in the protected area, but the independent smoke detection alarm has issued a fire alarm signal. Missing report refers to the actual fire within the protected area, but the independent smoke detection alarm does not give a fire alarm signal. Missing reports are more harmful than false positives. It will delay the fire and escape time and cause loss of people and property. Solving false positives and false negatives of independent photoelectric smoke detectors is a subject that needs to be studied forever. With the development of electronic technology, the application of different intelligent fire algorithms, the current product false positive rate and false negative rate It has been greatly reduced compared to a decade ago. By understanding the principle of photo-electrical smoke detection, we can correctly understand the phenomenon of false positives and false negatives, and use the products correctly in real life, avoiding the abandonment of independent photoelectric smoke detectors due to false alarms. A tragic phenomenon caused by a real fire. As mentioned above, the photo-electricity smoke fire detection alarm will realize the sound and light alarm of the fire as long as the smoke concentration reaches the preset alarm threshold, reminding people to extinguish and/or escape. Common causes of false positives are: False positives caused by installation in the kitchen: Generally speaking, the smoke generated by cooking is extremely tiny smoke particles. The accumulation of a large amount of smoke particles or soot can also cause the scattered light received by the light-receiving element to increase. Too much accumulation will result in an alarm signal. . Therefore, it is not recommended to install a stand-alone photo-electric smoke detector in the kitchen. If it must be installed, keep a certain distance from the cooker and clean the alarm frequently. False alarm caused by dust and water vapor retention: water vapor enters the photoelectric maze and may condense into small liquid particles when the temperature is low. It is similar to smoke particles. The dust also has the characteristics of smoke particles. Once the retention amount reaches the alarm condition, it will also be generated. Call the police. Therefore, in places where there is a large amount of dust or water vapor, it is not appropriate to install a stand-alone photo-electric smoke detector. False positives caused by smoking: Under normal circumstances, smoking does not cause false positives, unless there are many smokers smoking in the same room, resulting in very strong smoke, if an alarm condition is reached, an alarm will be generated. Smoking is also an important factor in causing fires. Therefore, smoking should be prohibited or strictly controlled in some densely populated areas (such as karaoke rooms, Internet cafes, etc.). Common reasons for underreporting are: Missing reports caused by installation factors: The independent smoke detector has a large protection area, the installation height is too high, and it is affected by the heat barrier. It is installed in the air outlet (such as air conditioning air outlet, convection window, etc.). If the speed is too large, there are obstacles around the installed position, etc., which may cause the smoke particles to not accumulate effectively in the event of a fire, and the concentration does not reach the alarm condition, resulting in underreporting. Underreporting due to environmental factors: Due to long-term dust accumulation, the insect net is blocked, the smoke can not enter the labyrinth and the alarm condition is not reached, resulting in underreporting. Under-reporting caused by product aging: Due to the long-term operation of the optoelectronic device, the performance is degraded, so that the sensitivity of the product is lowered, and the false report occurs in case of a small fire. No battery-induced under-reporting: The product is removed due to the continuous low-voltage alarm signal of the product, which causes the user to remove the battery and prevent the alarm from working properly. According to the statistics of the American Fire Protection Association, the reason for the lack of performance of the independent smoke detectors in home fires is as high as 75%, which is much higher than 4% of uncleaned causes and 3% of product defects. Although people often attribute false positives and false negatives to product quality problems, according to incomplete statistics, 70% of false positives and false negatives are related to the installation, use and maintenance of products. Therefore, regular product testing and maintenance are carried out as required. It is necessary and necessary. Specific requirements and analysis are as described above. Replace the independent smoke detection alarm at the right time: The independent smoke detection alarm is not only working in the event of fire and smoke. In fact, it constantly monitors the change of smoke particle concentration in the air. It is working at 365×24 hours. As with all electronic products, the performance of components will decrease over time, and the fire alarm sensitivity will also decrease. This type of product also has a certain service life. According to the recommendations of foreign research institutions, for safety measures, the independent smoke detection alarm should be replaced every 8 to 10 years, even if it can realize the alarm function. Conclusion Correct understanding of the role and necessity of independent smoke detection and alarm is the basis for its application. In China, local government guidance, guidance from fire-fighting professional organizations, extensive publicity by social organizations, and fire supervision and inspection are required. The forced installation of small-scale venues is a breakthrough and gradually promoted. It is believed that people's lives can be greatly saved and property losses can be reduced. . No.10 Blister Packing Staples,Metal Silver 26/6 Blister Packing Staples,Stainless Steel 26/6 Blister Packing Staples,Top Selling 26/6 Blister Packing Staples SHAOXING YIYOU STATIONERY CO.,LTD , https://www.yiyou-staple.com
Precautions for use of fire detection alarms