Selection instructions and application range of radar level gauge

How to choose a radar level gauge? What are the applications of radar level gauges? There are many types of radar level gauges. When selecting a type, the influence of the temperature, pressure, density, viscosity and corrosiveness of the measured medium on its performance should be considered first. Therefore, when selecting the type, one should select the appropriate antenna and meter according to the characteristics of the medium under specific working conditions. For tanks with small volumes and complex shapes or applications where multiple liquid interfaces need to be measured, a guided wave cable antenna radar level gauge is recommended; for tanks with complex measurement environments, such as volatile media, corrosion and high pressure And high temperature, etc., it is recommended to use a non-contact antenna radar level gauge. Since the level gauge does not contact the medium, it can avoid affecting its measurement accuracy or damage to the level gauge itself due to the physical and chemical properties of the medium. According to the purpose of medium measurement, radar level gauges with different measurement accuracy are selected. If it is only used for internal costing, the accuracy requirements do not need to be too high; if it is used for custody transfer, a high-precision radar level gauge must be selected. In order to save investment, cost-effective products can be selected on the premise that the measurement accuracy meets the requirements. Since the accuracy, routine maintenance and service life of the radar level gauge directly affect the production efficiency and economic benefits of the enterprise, excellent quality and satisfactory after-sales service are crucial for users. The selection principle is mainly considered from the following aspects, and the corresponding instrument selection specifications are specifically followed: (1) instrument performance; (2) medium characteristics; (3) installation conditions; (4) environmental conditions; (5) economic factors. The radar level gauge is composed of an electronic control unit and an antenna. The accuracy of the radar level gauge is slightly different in practical application and theoretical environment. The main reason is that the interference of the microwave by the tank and its internal obstacles determines the accuracy that can be obtained. The main factors are: (1) impedance jumps inside the instrument and at the connection of the antenna; (2) interference reflections from obstacles in the tank; (3) multiple reflections caused by the tank wall, tank top, and tank bottom; ( 4) Reflection interference caused by ripples on the liquid level surface. In addition, the characteristics of the liquid level medium have a certain influence on the measurement range. The liquid with a small dielectric constant has a great influence on the measurement distance of the radar level gauge, which reduces the measurement range; the liquid with a large dielectric constant has a negative impact on the radar level gauge. The influence of the measurement distance is small, which increases the measurement range. With the continuous development of the petrochemical industry, the radar level gauge is also constantly improving. In order to adapt to the special requirements of various operating environments, various types of radar level gauges have implemented a serial design. According to different measurement accuracy requirements, industrial control level radar level gauge or trade measurement level radar level gauge can be selected. According to the characteristics of the radar level gauge, it can be concluded that the radar level gauge is suitable for use in places where installation and use are convenient, the working environment is harsh, general mechanical instruments are difficult to apply, and the accuracy requirements are high. Its scope of application includes the following occasions: (1) The radar level gauge can be used for liquid level measurement of flammable, explosive, and highly corrosive media, especially for large vertical tanks and spherical tanks. (2) The radar level gauge is suitable for pressure from vacuum to several MPa, process temperature from subzero to 200 ℃ to 400 ℃ when using high temperature antenna. (3) The accuracy of the instrument is divided into industrial measurement grade and measurement grade accuracy, which can meet different measurement requirements and measurement requirements. (4) Different installation methods are used to meet the measurement requirements of spherical tanks, vaulted roof tanks, internal floating roof tanks and external floating roof tanks. The performance of various types of radar level gauges has its own characteristics. The suitable model should be analyzed and determined according to the specific working conditions such as the use requirements, the temperature, pressure, corrosion characteristics of the measured medium and the size of the use space. If equipped with different antennas to meet various measurement requirements, the most commonly used cone antennas can be used to install on the top of buffer tanks and storage tanks or their still-pipes, and are suitable for measurement sites with a large measurement range, while parabolic antennas are suitable for Liquid and solid phase material level measurement sites, and can be used for very long distance measurement, small horn antennas are suitable for small containers, and flat antennas are suitable for various working conditions. In addition, since the radar liquid level gauge uses the method of measuring the height of the air to obtain the liquid level height, that is to say, the distance from the measurement reference point on the top of the tank to the liquid level is measured. The actual value of the liquid level in the tank can be obtained by subtracting the empty height from the reference height (the distance from the measurement zero point to the reference point to the liquid level). Changes in the hydrostatic pressure and temperature in the storage tank will cause random changes in the reference height, resulting in measurement errors. Therefore, when the actual use requires accurate measurement, the radar level gauge, multi-point thermometer and pressure transmitter together form a large tank level measurement system.
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