Increasingly, managers and owners of enterprises and organizations trust the fire protection of their production and office space to automation. Modern smart security systems not only give an alarm in a timely manner, but also independently put out the fire. The eyes of any automatic system are sensors (detectors). They directly respond to the primary factors of the fire, creating a signal consisting of electrical impulses, understandable to fire automatics. Fire detector IP 212 3 - one of the modern sensors that meets the highest requirements.
A bit about the first fire detectors
The first fire detectors were TP thermal devices. This is 99% of all detectors used in fire-prevention systems of objects until about 1995. The device consists of two brass plates welded together with a special composition with a low melting point.
Depending on the type of room, on its operating temperature, alloys with different characteristics are used. Indeed, in the steel shop and, for example, in the finished goods warehouse at the ice cream factory, operating temperatures will vary greatly. Such sensors are placed evenly over the area of the room, as well as above the most fire hazardous points.
The principle of operation of the device is easy to describe. As the temperature rises above the critical alloy is destroyed, the plates under the action of the elastic force are bred from each other, which causes a sharp jump in resistance in the circuit AL. Despite the phenomenal simplicity, such a detector had one significant drawback - the extremely low response speed. Indeed, in order for the solder to melt, a fire should already burn in the room.
Principle of operation
The IP 212 3SU detector is a more advanced device capable of detecting a fire at an early stage. What is the basis of his work?
The “heart” of the IP 212 3SU device is the smoke chamber. A light emitter and a photodetector are located in the camera body. Their relative position is such that in normal mode the light produced by the emitter does not enter the receiver.
But standing in the room, and, accordingly, in the smoke chamber, smoke appears (and smoke is nothing but particles of solid carbon in the form of coal and graphite), as the picture changes. Some of the light rays reflected from the smoke particles begin to fall into the photodetector. And when the intensity of the radiation received by the photocell overcomes a predetermined threshold, the IP 212 3CU is triggered, and a sharp drop in resistance occurs in the signal loop circuit. The electronic filling of the device helps to cut off false positives by filtering out differences in natural light and household dust entering the camera.
Application and Characteristics
IP 212 3SU is used in all modern fire automation systems in conjunction with detectors and sensors of other designs, cameras and other security devices.
It is used to detect smoke:
- in private homes;
- apartments of multi-storey residential buildings;
- office premises;
- in warehouses of material values of any type;
- in industrial buildings and constructions of any, including agricultural, orientation.
IP 212 3SU has the following operational characteristics:
- dimensions: diameter - 9 cm, height - 5 cm;
- weight - 0.1 kg;
- can be used in the range from minus 40 to plus 60 ° C and humidity up to 98%;
- V power supply - 9 ... 30 V;
Response time - no more than five seconds.