What is the white cone on the ceiling

The white cone on the ceiling is a smoke detector.

The white cone mounted on the ceiling is a smoke detector, and the flashing of red light has corresponding rules. Generally, the normal flashing works and has corresponding self inspection function. This kind of thing is a relatively old way.

The white conical smoke detector can effectively detect the concentration of smoke and has a good preventive effect on fire. It mainly uses ion smoke sensor to sense on-site smoke. Compared with the sensor of gas sensitive resistor, it has much better performance, high reliability and stability.

Principle of smoke detector

The infrared beam of the infrared transmitting tube is scattered by smoke particles, and the intensity of the scattered light is directly proportional to the concentration of smoke. Therefore, the intensity of the infrared beam received by the photosensitive tube will change and be converted into an electrical signal, and finally into an alarm signal. The smoke sensing of the alarm is mainly completed by the optical labyrinth. There is a group of infrared transmitting and receiving photocells in the labyrinth, and the shooting angle is 135 degrees.

When there is no smoke in the environment, the receiving tube cannot receive the infrared light emitted by the infrared transmitting tube, and the subsequent sampling circuit has no electrical signal change. When there is smoke in the environment, the smoke particles enter the maze to scatter the infrared light emitted by the transmitting tube, and the intensity of the scattered infrared light has a certain linear relationship with the smoke concentration.

If the subsequent sampling circuit changes, judge these changes through the built-in main control chip of the alarm to confirm whether there is a fire alarm. Once the fire alarm is confirmed, the alarm sends a fire alarm signal, the fire indicator light is red, and the buzzer alarm is started.