Fire sensors of the security system
The fire alarm system is designed to detect fires, points in a room with high air temperature and smoke. These measures include a warning system, fire extinguishing, smoke removal, shut-off of supply ventilation and air conditioning to stop the spread of fire in the event of an emergency.
What components does a fire alarm consist of?
Fire alarm systems include sensors, receiving and control equipment, warning systems, communication paths, backup power supplies, special software and other elements.
Fire sensors are divided into four main types:
1) The thermal sensor of the fire alarm system reacts to temperature changes. Thermal sensors are divided into:
A) Threshold — with a set limit of a certain temperature level, after which the sensors will work.
B) Integral — react to a sharp rate of temperature change. Due to the temperature threshold at which the sensor is triggered, which is approximately 70 °C, threshold fire sensors have relatively low efficiency. The low cost of these sensors is the only factor affecting demand. Fires at an early stage can be detected using built-in fire detectors. However, due to the fact that they use two thermocouples – one outside the sensor, and the second inside, and the signal processing system is built into the sensor itself, the cost of such fire detectors will be high.
Only when heat is the main sign of a fire can heat sensors be used for fire alarms. 2) Smoke detectors. Smoke in the air is detected by smoke detectors. The theory of scattering infrared radiation on smoke particles underlies the work of almost all types of smoke detectors. The disadvantage of such a sensor is that it can work in environments with high levels of steam or dust. Despite the fact that it is obviously not used in dusty or smoky environments, the smoke sensor is used quite often. 3) The flame sensor indicates the presence of an open fire or a smoldering fireplace. Flame sensors use infrared sensors to detect fire early after reading its infrared radiation. Flame detectors should be installed in places where a fire can occur without first releasing smoke. Since flame detection occurs at an early stage, when there are no conditions such as smoke and a significant increase in temperature, they are more effective than the previous two types of sensors. In addition, in some industrial buildings characterized by high dust content or significant heat exchange, only fire detectors are used. 4) Combined fire alarm sensors combine different ways of identifying fire indication. More often combined sensors combine a heat detector with a smoke detector. This allows you to more accurately determine the presence of a fire indication so that you can send an alarm to the remote control. The complexity of the technologies used to create these sensors has an impact on their cost. A properly constructed fire alarm system, depending on the information from the fire detector, is directly responsible for the entire effectiveness of the fire extinguishing system. Thanks to this, it is possible to evaluate the effectiveness of the fire protection system of the building as a whole, taking into account the optimal location, the use of the appropriate type of sensor for certain rooms and the quality of fire detectors. Using the Ajax sensor as an example, we will show the principle of operation and features of combined fire sensors.
FireProtect 2 (Heat/Smoke/CO) — Wireless fire sensor with Smoke, Temperature and carbon monoxide sensors
The FireProtect 2 wireless fire sensor (Heat/Smoke/CO) is designed for rapid fire detection. The dual spectrum sensor can distinguish smoke from steam. Thermistors react quickly to a sharp increase in temperature due to the combustion of synthetic materials that emit little or no smoke during gorenje gorenje. The one-of-a-kind smoke chamber does not need to be cleaned, and the software reduces erroneous alarms. All this meets the latest fire safety standards. Thoughtful fasteners and sensor design, as well as settings via a smartphone, ensure easy and quick installation of a fire sensor. A built-in siren for alarm and event notification is included in the fire detector. The FireProtect 2 wireless fire sensor (Heat/Smoke/CO) can work both independently and as part of the Ajax security system.
The fire alarm sensor is available in two versions. The model with replaceable and unchangeable batteries is RB and SB, respectively.
