Fire protection systems
For early detection of the risk of fire and to prevent it used a large number of sensors (smoke, fire, temperature, gas). In some instruments they used at the same time for more efficient fire detection. In addition to performing the basic function, they can prevent the security of the building on the identified threats, send notifications to activate the fire service or fire extinguishing system in the room.
The principle of operation of smoke detectors
The most common type of sensor that has an affordable price - smoke dot the fire - works because air through a special camera. Here it is irradiated with infrared rays which, when reflected from smoke particles fall on the photodetector. Counter analyzes the frequency of the received pulses and only in case of exceeding a certain threshold notify threat. Some sensors depending on the intensity of signals determine the level of risk. Thus they do not notice immediately sounding the alarm and warn only minor deviations from the norm.
However, these sensors there are drawbacks, including the need to often conduct their inspection and cleaning (from one to five times in six months). Otherwise, it increases the risk of false positives or vice versa reduced sensitivity. They sometimes react to dust, if the air in the building does teeming these particles. For more information on those who are already using these devices, you will find in a review.
Other fire sensors
There detectors working on gas sensors and responsive to the presence of hydrogen and carbon oxides. The main advantage of such devices - is a notice of potential hazards, for example, leakage of gases.
Thermal sensors are rarely used as independent fire protection devices, they are usually embedded in the aforementioned point-fire detectors. These are used to supplement the information received.
How and where are they installed?
Before you buy selected fixtures, you must familiarize yourself with the requirements for their installation. First of all pay attention to the number of the room. The distance between them should not exceed 9 m, with the proviso that the ceiling has a flat or obstacles such as furniture items, spotlights, etc., which prevents the free movement of air. This indicator refers to the premises up to 3.5 m, otherwise the distance is reduced between the detectors.