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Knowledge of smoke alarm - smoke alarms, fire alarms - Fire Industry

By: betty zhang


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Smoke Alarm , Another name Fire Smoke Alarm Devices, smoke sensors, smoke detectors and so on. Generally independent, battery-powered or AC powered battery backup power, ready-made sound and light alarm can be issued when the instructions, known as the stand-alone smoke alarm. Powered by the bus, the bus can connect multiple, and Fire Alarm Controller networking, communications, the formation of a alarm system, alarm on-site non-voice, sound and light have prompted the host, such smoke alarm device is typically referred to Smoke Detector . Smoke Detector Zoning codes address, without address encoding.

Smoke alarms from the use of sensors to be divided into ionic smoke alarm, photoelectric smoke alarm and so on.

Ions have a smoke alarm ionization chamber, ion chamber used for radioactive elements - americium 241 (Am241), intensity of about 0.8 micro-Curie, the normal state of equilibrium in the electric field, when there is smoke into the ionization chamber will destroy This balance between alarm circuit to detect concentrations exceeding the threshold set an alarm.

Photoelectric smoke alarm inside an optical labyrinth, installed IR On the pipe, smoke-free when the infrared receiver to recover less than infrared emission control infrared light, when the smoke and dust into the optical maze, through refraction, reflection, receiving tube receives the infrared light, smart alarm circuit judge exceeded the threshold value, if more than alarm.

Ion smoke alarms on the tiny smoke particles sensitive sensor to some, a balanced response to various tobacco; and prior to the photoelectric smoke alarms smoke particles on the larger sensor is more sensitive on gray smog, black respond badly smoke. In case of raging fire, the smoke of tiny particles in the air more, and smoldering, the air in the larger smoke particles more. If a fire occurs, generated a lot of smoke of tiny particles, ion smoke detectors photoelectric smoke alarm than the first alarm. Both smoke alarms is not the time interval, but the fast spread of such fire, such a place recommended to install smoke alarms better ion. After another smoldering fires, producing a number of larger smoke particles, photoelectric smoke alarm smoke alarm than the ion first alarm, such establishments proposed photoelectric smoke alarms installed. If you want to be a combination of both strengths, you can require the installation of smoke alarms in places where the two smoke alarms are the placement.

Smoke alarms due to the ion is sensitive to small particles, so there will be cooking faster response. If you have encountered such problems, you can have the following options:

1) the smoke alarm installed in a place more distant from the cooking, then the alarm when smoke particles will reach the weak many, if you choose this method, it should be clear that the air flow direction. Otherwise not have much effect.

2) Install a photoelectric smoke alarm. When the fires produced the smaller particles, you may lose the opportunity early warning, but you also save more than smoke alarms malfunction trouble.

3) install a plasma / optical combined smoke alarm. If the combination of two sensors, ion sensors can set the sensitivity of the small number of such devices will reduce false positives, and you can have one pair of raging fire spread quickly and spread of slow smoldering fires have greater sensitivity of the smoke alarm.

4) install a mute function of ion smoke alarms. This way you can reduce the sensitivity of alarm for 15 minutes, smoking, or cooking to avoid piercing alarm.

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