Fiber Bragg Grating Temperature Sensor

The IF-FBG fiber optic grating temperature sensor is a new type of temperature sensor developed specifically for temperature measurement of power switchgear, utilizing the inherent temperature sensing characteristics of fiber optic gratings. It is suitable for temperature monitoring and fire alarm at high-voltage power switchgear, high-voltage cable joints, etc. in power plants, substations, and other places. It has many advantages such as high temperature measurement accuracy, high voltage resistance, anti creep, corrosion resistance, strong lightning resistance, and no strong electromagnetic interference.

The IF-FBG-T400 single ended ceramic fiber optic grating temperature sensor is specifically designed for monitoring the contact temperature of 10KV power switchgear;

The IF-FBG-T600 single ended ceramic fiber optic grating temperature sensor is specifically designed for monitoring the contact temperature of 35KV power switchgear;

The IF-FBG-T700 dual ended ceramic fiber optic grating temperature sensor is specifically designed for monitoring the contact temperature of cable joints;

The IFDI anti pollution flashover climber is developed to increase the creepage distance of the tail fibers of IF-FBG-T400 and IF-FBG-T600 fiber Bragg grating temperature sensors, effectively suppressing the occurrence of pollution flashover
The appearance of elephants.

Fiber Bragg Grating Temperature Sensor characteristic

High precision, stability, and reliability

● Intrinsic safety, not affected by electromagnetic interference, corrosion resistance, pollution resistance, and strong lightning resistance. It can be applied under harsh conditions such as strong electromagnetic interference, high lightning strikes, flammability, and explosiveness

The transmission distance of sensing signals is far, up to 40Km

● Quasi distributed measurement, multiple sensors can be connected in parallel on a single fiber optic cable (typical: 12)

Ceramic packaging, with strong resistance to high voltage, anti creep, and flame retardancy

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Introduction to Fiber Bragg Grating Temperature Detection and Alarm System for Oil Tanks/Liquefied Gas Tanks

The vast majority of the storage tank areas in the petrochemical system are located in sparsely populated wilderness areas, with relatively harsh surrounding environments. However, direct exposure of oil tanks to sunlight can easily cause local high temperatures, and even lead to fires due to the development of oil and gas volatilization to a certain concentration. For a long time, it has been difficult to monitor the temperature of the outer wall of oil tanks in real time because oil tanks are located in the wilderness and their storage materials are high-risk products – various oil products. The reliability, real-time performance, and inherent safety of traditional temperature sensing fire monitoring systems used in hazardous chemical areas are difficult to ensure. So, in recent years, there have been multiple fire accidents in the storage tank area, causing huge economic losses.

The oil tank fiber optic grating temperature detection and alarm system is designed to monitor the temperature parameters of key parts on the oil tank in real time, targeting the working and operating conditions of petrochemical companies. Fiber optic grating temperature sensing probes with fast temperature response characteristics are installed in a distributed manner at a certain density (usually 3 meters point distance) on the top and outer wall of the oil tank, achieving real-time temperature monitoring and automatic fire alarm for oil tanks/liquefied gas tanks, etc. It has real-time electronic map display, on-site temperature analysis function, and multi-level alarm, historical record, report analysis and other functions to ensure the safe operation of oil tanks throughout their entire life cycle, providing basic management data and scientific basis, significantly improving the overall management level of oil tanks, and achieving early detection and prediction of hazards.

System structure
The fiber optic grating temperature sensing fire detection system mainly consists of fiber optic grating temperature sensors, fiber optic sensing analyzers, signal transmission optical cables, and automatic alarm software systems. The fiber optic grating temperature sensing probes are connected in series with anti-static fiber optic tail fibers to form a chain, and finally converged into a multi-core optical cable, which is remotely connected to the fiber optic sensing analyzer in the monitoring room.

system function

[Automatic Fire Alarm]

The fiber optic grating fire automatic alarm system automatically conducts real-time temperature inspections of the area where the fiber optic grating temperature fire detector is located, detects abnormal temperature fluctuations on the oil tank site, and promptly alarms before a fire occurs.

Location of monitoring points

The LCD display screen of the fiber optic grating fire automatic alarm system displays the real-time numbers and current temperature values of each oil tank and corresponding temperature monitoring points, as well as the actual geographical location, in electronic map format. Operations and maintenance by aspect management personnel.

[Status Query]

The temperature and alarm information of each monitoring point are stored in the large capacity storage of the fiber optic grating temperature sensing fire detection analyzer. The system divides the data into historical information and real-time information based on time, and management operators can dynamically adjust the real-time status monitoring time interval of monitoring points according to different periods to meet practical requirements. Management operators can view the historical temperature change curves of each monitoring point, providing data support for decision-making and maintenance.

[Alarm Setting]

Management operators can set the alarm triggering conditions of the fiber optic grating temperature sensing fire detection analyzer to adapt to the differences in actual operating temperatures of oil tanks under different seasonal temperature conditions. The alarm triggering conditions set by the system at the factory are:

Temperature exceeds 85 ℃

The temperature rise rate exceeds 8 ℃/min

Exceeding the average temperature value within the area by more than 15 ℃

System linkage

The switch quantity output of the fiber optic grating temperature sensing fire detection analyzer can be directly connected to the existing fire controller in the instrument operation room through the alarm interface, achieving fire alarm and display in the fire duty room; At the same time, the fiber optic grating temperature sensing fire detection analyzer can directly connect two sound and light alarms in the instrument operation room to provide fire sound and light alarms and fiber optic grating temperature fire detector fault alarms.

Line inspection and fault location

Accurate positioning of losses and breakpoints in fiber optic transmission lines, facilitating system debugging, maintenance, and line maintenance