Why is the red light on the roof of the hotel room always on? What's this

That's a smoke sensor. The principle is that it has its own infrared rays. If the infrared beam is scattered by smoke particles, there will be a problem of flickering. If it detects that the indoor concentration is relatively high and exceeds the set range, an alarm will sound.

1. Normal flashing red light

The smoke alarm will flash red light when it is working normally. However, this flashing red light only flashes red once every few seconds, some of which are 15 seconds. Flashing left and right once indicates that the smoke alarm is inspecting. Once an abnormality is detected, the red light will flash frequently or continuously, or even alarm to notify the user.

2. Strobe or flash continuously

When the smoke alarm detects that the internal gas concentration reaches a certain standard and triggers the alarm rule of the smoke alarm, the smoke alarm will flash. Or if the light is always red, this means that the smoke in the air is abnormal. Please check in time to rule out whether there is a fire or other smoke conditions.

3. Strobe plus alarm

In many cases, when the smoke alarm detects abnormal conditions, it will flash or keep flashing red light. Different brands of smoke alarms do not work. Similarly, most smoke alarms have audible and visual alarms, and there will also be roaring sounds and frequent red lights to warn users that there is an abnormality in the air in their home. Please check it in time!

The flashing red light of the smoke alarm is divided into normal conditions and abnormal conditions. You need to operate according to the instruction manual of the smoke alarm. Once an abnormality occurs, please promptly follow the sound and light emitted by the smoke alarm. Call the police to troubleshoot abnormalities and solve problems immediately!