How do Smoke Alarms Work?

The smoke alarm is actually another name for the smoke or smoke alarm. The smoke alarm is to realize the fire prevention by monitoring the smoke concentration. The ionic smoke sensor is used inside. The ionic smoke sensor is an advanced technology and stable work. Reliable sensors are widely used in various fire alarm systems, and their performance is far better than that of gas-resistance fire alarms.

The infrared beam of the infrared transmitting tube is scattered by the soot particles. The intensity of the scattered light is proportional to the smoke concentration, so the intensity of the infrared beam received by the photosensitive tube will change, be converted into a point signal, and finally be converted into an alarm signal. The smoke detection of the alarm is mainly completed by an optical maze. There is a group of infrared transmitting and receiving photocells in the maze, and the angle of incidence is 135 degrees. When there is no smoke in the environment, the receiving tube cannot receive the infrared light from the infrared transmitting tube, and no electrical signal changes in the subsequent sampling circuit; when there is smoke in the environment, the smoke particles enter the maze to scatter the infrared light emitted by the transmitting tube. The intensity of the scattered infrared light has a linear relationship with the smoke concentration. The subsequent sampling circuit changes. The main control chip built in the alarm judges these changes to confirm whether a fire has occurred. Once the fire alarm is confirmed, the alarm sends out a fire alarm signal and a fire indication. The light (red) lights up and starts a buzzer alarm.

1. Power supply: 9V alkaline battery or carbon battery.

2. Working current: The static current is less than 10UA, and the working current is between 20-25UA.

3. Smoke sensitivity: Meets UL's 217 standard.

4. Working temperature: 40oF-120oF (-4 -50 ).

5. Gas interface temperature: 10% -90%.

6. Buzzer sound level: 85 dB at 10 feet.

7. Battery life: about 1 year.

1. The detector is already in working state after installation. In this state, the LED on the detector blinks about once every minute.

2. When the combustion particles are detected, the detector will emit a clear and loud pulsating alarm sound until the air is flat again.

1. A smoke sensor is installed every 25-40 square meters in the room, and 0.5-2.5 meters above important equipment is installed.

2. Select a suitable installation area to fix the seat with screws, connect the smoke sensor line color and screw it on the seat.

3. Draw two holes on the ceiling or wall according to the holes of the mounting bracket.

4. Drill two holes in two holes.

5. Insert two plastic waist nails into the two holes, and then press the back of the mounting bracket against the wall.

6. Plug in and tighten the mounting screws until the mounting bracket is removed firmly.

7. This detector is a closed device and is not allowed to open. Please insert the battery into the compartment on the back of the device.

8. Have the back of the detector close to the installation position and turn clockwise. And make sure that the two screw heads have been slid into the waist holes. Gently press the test button to see if the detector is working properly ^[1]

1. Press the test button for at least 3 seconds, a crisp and loud pulsating alarm signal will be issued.

2. This means that the detector is really working, and at the same time as the alarm, the LED flashes quickly.

3. The detector can also be tested by blowing smoke into the detection cavity. (Do a test every week to prove the reliable operation of the detector)

4. Do not install the ground higher than temperature and humidity, otherwise it will affect the sensitivity.

5. In order to keep the sensor working well, the sensor needs to be cleaned every 6 months. Turn off the power first, then swipe the dust with a soft brush, and then turn on the power.

The detector is suitable for industrial and civil buildings where there is a large amount of smoke at the time of a fire and is normally smoke-free, such as: restaurants, hotels, teaching buildings, office buildings, computer rooms, telecommunications rooms, bookstores and archives. However, it is not suitable for places where a large amount of dust and water mist are trapped; it is not suitable for places where steam and oil mist may be generated; it is not suitable for places where smoke is trapped under normal circumstances ^[1] .