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In recent years, with the continuous development of the chemical industry, there have been increasing demands for accurate, safe, and stable liquid level measurement in tank areas. Thanks to their advantages, contactless radar level gauges are being used more and more widely for measuring solids and liquids in refinery tank areas. 1 Principles of operation and application conditions of contactless radar level gauges. Contactless radar level gauges are a new type of liquid level measurement instrument with high reliability. It sends microwaves to the liquid being measured through an antenna, and determines the liquid level based on the time and frequency of the reflected waves. Since no contact with the liquid is required, the internal sensing elements are not subject to corrosion by the liquid, which extends its service life. At the same time, the microwaves emitted by radar level gauges are a type of electromagnetic wave; they do not require a medium for propagation and can penetrate smoke or steam, thereby ensuring the accuracy of their measurement data. Principle: The microwave signals sent to the storage tank are reflected back from the surface of the material. By measuring the time difference or frequency difference between the emission and reception of these signals, the level height of the material can be determined. Suitable for harsh process conditions such as high corrosion and strict hygiene/sterility requirements ； Suitable for storage tanks, reaction vessels, and process tanks under various process conditions ； Suitable for measurement applications with high precision requirements. 2 Advantages of contactless radar level gauges in refinery tank farms Compared to other level measurement instruments, contactless radar level gauges have significant advantages; their use of advanced algorithms, high frequency, simplicity in calibration, and ease of connection contribute to their widespread application. Advantage 1: Advanced algorithms. Through 30 years of experience in this industry, Dinghua Electronics possesses a set of technologies for micro-vibration analysis and echo processing; these technologies enable accurate measurement, as well as effective tracking and detection of the liquid level. Advantage 2: Simple debugging ； The display screen allows for an intuitive view of the measurement waveform, and by examining this waveform, it is easy to determine the operating status of the instrument. Advantage 3: High frequency ； It ensures a smaller beam angle for the instrument, greater resistance to interference, higher stability and reliability in measurements, as well as a smaller antenna size that facilitates installation. Advantage 4: Frequency modulation technology ； The Dinghua Electronics DHE-RD radar level gauge utilizes FMCW frequency-modulated continuous wave technology. By using the frequency difference of the electromagnetic waves emitted and received, the sensor can calculate the phase distance with extremely high precision. Advantage 5: Easy to connect ； The Dinghua Electronics DHE-RD radar level gauge offers a variety of process connection options, which helps to minimize the risks associated with instrument installation. Advantage 6: Wide range of applications ； The Dinghua Electronics DHE-RD radar level gauge comes with a variety of antenna options, allowing it to be used in different types of applications. It is not affected by factors such as the density, viscosity, conductivity, dust, or corrosiveness of the medium. 3 Application of non-contact radar level gauges in refinery tank farms: Considering the properties of the medium being measured, non-contact radar level gauges are suitable for use with media that are at high temperatures, high pressures, or are highly corrosive. By preventing direct contact between the level gauge and the liquid, it is possible to ensure the accuracy of the measurement data while also protecting the level gauge from damage. The main tank types to be considered for the medium under test are storage tanks, reaction tanks, separation tanks, and river tanks. For storage tanks, the material of the tank body and its height need to be taken into account, with top-mounted installation being the preferred method. For the reaction tank, the pressure inside the tank needs to be taken into consideration, and it is installed in a side-mounted manner. The separation tank is installed with a bypass pipe. Other factors should also be taken into account. In addition, when selecting a radar level gauge, environmental conditions, installation conditions, economic factors, as well as other aspects such as measurement range and frequency must also be considered. When measuring objects that are corrosive or prone to crystallization, in order to avoid the impact of various factors on the antenna and prevent crystals on the antenna from affecting its proper operation, a non-contact radar level gauge should be used, thereby reducing the occurrence of various faults and preventing errors in the data obtained. In conclusion, contactless radar level gauges have significant advantages in measuring conditions of high temperature, high pressure, and corrosivity. However, to ensure their proper operation, it is necessary to take various factors into consideration during selection in order to guarantee the stable functioning of the instrument.