The optical fiber level gauge is an advanced and reliable solution for liquid level monitoring in oil tanks. Developed by Wuhan Xinyi Optoelectronics, this new generation of optical fiber level meter is designed to meet the growing demand for precise and safe liquid level measurement in industrial environments.
The working principle of the optical fiber liquid level meter is based on laser ranging technology. A laser beam is coupled into the optical fiber and guided to the top of the tank through a special collimating device. The controller and light source are located in the central control room, ensuring that the measurement site remains completely free of electrical signals, making the system inherently safe and explosion-proof. Unlike older models that relied on photoelectric encoders, this system integrates modern laser ranging and fiber coupling technologies, resulting in a more compact design, higher accuracy, better stability, and easier installation and maintenance.
The technical description of the optical fiber level gauge highlights its high precision, sensitivity, and reliability. It can be used for measuring various types of tanks and media, including liquid level, volume, and mass calculations. The system supports functions such as high/low level alarms, automatic reporting, and continuous monitoring. Its explosion-proof rating makes it suitable for use in flammable and explosive environments, such as those found in the petrochemical, metallurgical, and gas industries.
Installation is straightforward. For existing tanks, the gauge can be installed from the top manhole, while new tanks can be pre-fitted with installation holes. No hot work or tank cleaning is required during installation, which enhances safety and reduces downtime. This makes the optical fiber level gauge ideal for retrofitting and upgrading automated tank monitoring systems.
The core system consists of two main components: the sensor and the controller. The fiber-optic sensor probe includes a high-precision optical coupler and an optical path adjustment device, responsible for transmitting and receiving optical signals and collecting liquid level data. The probe is mounted at the top of the tank and operates using only optical signals, eliminating any risk of electrical hazards.
The controller features a power supply, fiber-level sensing module, conversion circuit board, and display screen. It handles signal modulation and demodulation, converting optical signals into electrical signals for further processing. Additional features include system initialization, historical data retrieval, channel settings, time configuration, and factory reset. The controller also offers multiple communication interfaces, such as 4–20 mA, RS232, RS485, and GSM modules, allowing seamless integration with industrial control systems, computers, and displays.
Key characteristics of the optical fiber level gauge include modularity, isolation from the measured medium, on-site display, and data memory, making installation and maintenance simple and user-friendly. The system uses optical fiber for signal transmission, offering long-distance capabilities and strong resistance to interference. Since the measurement site is not electrified, it ensures absolute safety and explosion-proof performance.
With a measurement accuracy of up to ±3 mm and a range of up to 25 meters, the system is highly accurate and versatile. It is easy to install, requires no tank cleaning, and eliminates the need for hot work, making it both convenient and safe. The modular design ensures high reliability and low failure rates, while the wide range of applications includes atmospheric, pressure, and vacuum tanks in various industries.
The optical fiber level gauge is especially suited for measuring liquid levels in floating roof and external floating roof tanks, as well as other types such as vertical, horizontal, and spherical tanks. It provides real-time monitoring, alarm functions, and data transmission, making it a valuable tool for industrial automation and safety management.
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