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The accuracy of radar level gauges varies slightly in practical applications compared to theoretical conditions. The main reason is that the interference of the tank and its internal obstacles with microwaves determines the achievable precision. The main factors include: (1) impedance jumps inside the instrument and at the antenna connections; (2) interference reflections caused by obstacles inside the tank; (3) multiple reflections resulting from the tank walls, roof, and bottom; (4) reflection interference caused by ripples on the liquid surface. Furthermore, the properties of the liquid at the level have an impact on the measurement range. Liquids with a low dielectric constant have a significant effect on the measuring distance of radar level gauges, thereby reducing the measurement range; whereas liquids with a high dielectric constant have a minor effect on this distance, resulting in an increased measurement range. With the continuous development of the petrochemical industry, radar level gauges are also constantly being improved. To meet the specific requirements of various operating environments, different types of radar level gauges are designed in a series format. Depending on the required measurement accuracy, either an industrial control-grade radar level gauge or a trade metering-grade radar level gauge can be selected. Its application scope includes the following situations: (1) Radar level gauges can be used for measuring the level of flammable, explosive, highly corrosive, and other types of media, and are particularly suitable for measuring levels in large vertical tanks and spherical tanks. (2) Radar level gauges are suitable for pressures ranging from vacuum to several megapascals, process temperatures from minus degrees to 200°C, and up to 400°C when high-temperature antennas are used. (3) The accuracy of instruments is divided into industrial measurement grade and metrological grade, enabling them to meet various measurement and metrology requirements. (4) Different installation methods are employed to meet the measurement requirements of spherical tanks, dome tanks, internal floating roof tanks, and external floating roof tanks. The performance of various types of radar level gauges varies, and the appropriate model should be selected by analyzing specific operating conditions such as usage requirements, the temperature, pressure, corrosion properties of the medium being measured, and the dimensions of the installation space. By using different antennas, various measurement requirements can be met. The most commonly used cone antenna can be installed on the tops of buffer tanks and storage tanks or on their waveguides, and is suitable for measurement in applications requiring a wide measurement range. Parabolic antennas are appropriate for measuring the levels of liquid and solid materials, and can also be used for measurements over very long distances. Small horn antennas are suitable for small containers, while planar antennas can be used in a variety of operating conditions. Furthermore, since radar level gauges determine the liquid level by measuring the height to the free surface, that is, by measuring the distance from the reference point on the top of the tank to the liquid surface. Xi’an Dinghua Electronics Co., Ltd., established in 1992 and currently located in Xi’an, Shaanxi Province, is a high-tech enterprise that specializes in the research and development, production, sales, and engineering services of radar level measurement instruments. At present, the company offers a range of products including radar level gauges, external liquid level meters, fork-type level switches, electro-hydraulic actuators, ultrasonic flowmeters, and external thermometers. All of these products have withstood numerous complex operating conditions in actual field applications, and are widely used in industries such as petroleum, chemicals, power generation, coal mining, metallurgy, as well as food and pharmaceuticals. Professional selection guidance, excellent product quality, reasonable prices, fast delivery times, and comprehensive pre-sales, in-sales, and after-sales services…