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Why can electronic smoke trigger smoke alarm?


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Smoke alarm tests the concentration of inhalable particles in the air, and we often say PM2.5. When the concentration of PM2.5 in the air exceeds the standard, the smoke alarm will give an alarm, and although the smoke of electronic smoke is not generated by combustion, it will also trigger the smoke alarm. At present, TIF smoke sensor in the United States is to monitor the concentration of smoke to achieve fire prevention. The internal smoke alarm usually uses the ion type smoke sensor. The ion type smoke sensor is an advanced technology, which works stably and reliably. It is widely used in various fire alarm systems, and its performance is far better than the gas sensitive resistance type fire alarm. Smoke sensors are used to detect the presence and concentration of smoke in the environment, such as smoke in the event of a fire. When the smoke probe touches the smoke or some specific gas, its internal resistance value changes and generates an analog value to control it. The smoke sensor uses the principle that the smoke sensor is affected by the smoke (mainly combustible particles) concentration to change the resistance value to send the corresponding analog signal of the smoke concentration to the host; the smoke sensor mainly includes the ion type smoke sensor, the photoelectric type smoke sensor and the gas sensitive type smoke sensor; among them, the ion detector is formed by the charged particles (ions) after the ionization of the uncharged particles, So it is called ion smoke detector, which is suitable for the detection of open fire. The detection chamber of photoelectric smoke sensor is equipped with optical sensor (emission light source and photoelectric receiver). When smoke enters into the detection chamber, it will block the emission of light and generate scattering. The photoelectric receiver will receive the signal that changes due to the scattering of light, and then generate the change of current signal. Gas sensitive Smoke sensor is a kind of sensor to detect specific gas. It mainly includes semiconductor gas sensor, contact combustion gas sensor and electrochemical gas sensor, among which the most widely used is semiconductor gas sensor. Its application mainly includes: detection of carbon monoxide, gas, gas, freon (R11, R12), ethanol in exhalation, halitosis, etc.; it converts the information related to gas type and concentration into electrical signals, according to the strength of these electrical signals, the existence of the gas to be tested in the environment can be obtained Relevant information can be used for detection, monitoring and alarm, and automatic detection, control and alarm system can be formed by interface circuit and computer. TIF sensors are commonly used in domestic and factory gas leakage devices, suitable for detection of liquefied gas, butane, propane, methane, alcohol, hydrogen, smoke, etc

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