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fiber optic alarm systems Using distributed temperature sensing cables

Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China

Fluorescent fiber optic temperature measurement Fluorescent fiber optic temperature measurement device Distributed fluorescence fiber optic temperature measurement system

Introduction to Distributed Fiber Optic Temperature Detection Fire Alarm System

The distributed fiber optic temperature detection fire alarm system is a new and efficient temperature detection and alarm facility, which integrates computer, fiber optic communication, fiber optic sensing, fiber optic transmission, photoelectric control and other technologies. Based on the temperature measurement principle of fiber optic backscatter changing with temperature, advanced OFDR technology is used to monitor the feedback information on the fiber optic in real time through fiber optic detectors, measure the temperature changes at various points on the fiber optic, and monitor the temperature status of the detected area in real time. The distributed fiber optic temperature sensing fire alarm system mainly consists of fiber optic temperature sensing fire detectors (referred to as fiber optic detectors), fiber optic temperature sensing fire detection signal processors (referred to as fiber optic signal processors), computer display processing units, fire alarm controllers, and power supplies.

The communication interface between the fiber optic signal processor and the computer is: connected to the local computer through a serial communication RS232 port; Connect to remote computers through LAN TCP/IP ports. The local computer is used to achieve data communication between software systems and fiber optic signal processors. The input and output interfaces of the fiber optic signal processor can achieve functions such as alarm output, fault output, alarm signal input, and alarm reset control of the distributed linear fiber optic temperature sensing fire detection system. When used in conjunction with the encoding input/output module, the fire alarm controller can directly receive normal, fire alarm, warning, and fault information, and can reset the fiber optic signal processor.

Characteristics of Distributed Fiber Optic Temperature Sensing Fire Alarm System

The pulse laser source of the distributed fiber optic temperature detection fire alarm system has a longer lifespan and higher reliability. The specific system features are as follows:

(1) Safe and reliable. The sensor is based on light detection, which is inherently safe and explosion-proof, resistant to power frequency and radio frequency electromagnetic interference, and has a low false alarm rate.

(2) Distribution measurement. The fiber optic signal processor can be connected to the fiber optic detector to continuously detect the temperature of the fiber optic detector in real-time.

(3) Flexible alarm settings. Fiber optic detectors can be divided into up to 128 detection zones, and alarm parameters and linkage relationships can be set on-site for each detection zone.

(4) Advanced alarm methods. It can comprehensively utilize the setting of multi-level temperature alarms/temperature rise rates/temperature rise trends for continuous monitoring, accurately display the temperature status at any point at any time, and provide early warning before a fire occurs.

(5) Accurate temperature measurement and positioning. The temperature accuracy can reach ± 1 ℃, and the spatial resolution can reach 0.5 ℃. Accurately determine the type of temperature change, display the location of the accident point and temperature values.

(6) The information display is intuitive and rich. By displaying alarm parameters, detecting zone distribution, measuring temperature, fire spread direction and other information through a computer, operational data records and charts can be provided.

(7) On site fiber optic detectors are maintenance free. Easy to debug, the fiber optic detector is protected by high-strength polyamide plastic sheath or stainless steel tube, and the fiber optic detector itself serves as a sensor without maintenance. It can withstand various harsh environments (humidity, high temperature, severe cold, corrosion) and has a service life of up to 30 years. After the alarm, there is no need to go to the site for resetting and processing.

Application of Distributed Fiber Optic Temperature Sensing Fire Alarm System in Places

The distributed fiber optic temperature sensing fire alarm system provides a complete solution for fire detection with significant mature technological advantages and absolute safety performance. The scope of application of the system is as follows:

(1) Temperature measurement and monitoring in important areas. For example: power plant cable trays, power plant boiler burners, substations, coal conveying system transmission belts, computer rooms, television stations, communication rooms, mobile base stations, control rooms, cable channels, etc.

(2) Temperature measurement and monitoring in hazardous areas. For example: oil tanks, gas tanks, coal silos, hazardous material warehouses, etc.

(3) Temperature measurement and monitoring in the field of transportation. For example: subways, tunnels, railways, airports, cabins, etc.

(4) Large area and wide range temperature measurement and monitoring. For example: granaries, cold storage, warehouses, paper mills, distilleries, pharmaceutical factories, beverage factories, tobacco factories, etc.

(5) Measurement and monitoring of surface temperature of pressure vessels. For example, gasifiers, reaction tanks, etc.

The significant features of distributed fiber optic temperature measurement technology are anti electromagnetic interference, intrinsic safety and explosion-proof, and real-time continuous temperature detection. In industrial and mining enterprises, many changes in physical properties are directly reflected in the rise and fall of temperature, so the significance of temperature monitoring is becoming increasingly significant. Overheating at cable joints, partial discharge of high-voltage cables, and other locations is the main hidden danger of large-scale accidents in industrial sites, and it is also an important reason for the frequent occurrence of accidents. How to implement online testing, how to predict equipment safety and analyze temperature trend changes, how to scientifically analyze equipment quality, engineering quality, operating environment, operating mode, equipment aging and fatigue status, load imbalance, etc. through real-time data. For many years, due to the limitations of technological level, the safe operation level of the power system has been restricted to a certain extent. Although attempts have been made to use infrared thermometers, infrared imaging devices, temperature sensing cables, partial discharge testers, and traditional point temperature measurement systems to solve the above problems, these measurement methods cannot detect the overheating and insulation aging problems caused by partial discharge of high-voltage cables, and cannot achieve online detection. Therefore, they cannot provide scientific basis for safe, economical operation, and efficient maintenance. Distributed fiber optic temperature measurement technology has completely solved this problem, truly realizing real-time online detection of power system operating equipment. Through real-time data analysis and prediction of equipment, faults are eliminated in their early stages, truly preventing problems before they occur. At the same time, these real-time data and analysis prediction results also play a crucial role in achieving condition based maintenance, improving maintenance efficiency, and reducing maintenance and management costs in the future. With the development of fiber optic application technology, fiber optic temperature measurement systems have become the world’s most advanced and effective continuous distributed temperature monitoring systems, widely used in industrial sites such as petrochemical, power, transportation, and steel.




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