Application difference between servo level gauge and radar level gauge

Measuring principle of radar level gauge: It mainly adopts the measurement technology based on FMCW frequency modulation continuous wave to measure the time signal between the reflected wave and the transmitted wave of the radar wave. Through the intelligent echo analysis system, the measurement of the time signal is converted into the frequency The measurement of the signal, combined with pure digital processing technology, obtains the measurement of the liquid level. Measuring medium: The main application objects are crude oil, heavy oil products and chemical products with high viscosity. Installation tank type: suitable for measuring the liquid level of various types of storage tanks. Advantages: non-contact measurement, can measure toxic media, viscous liquid. Disadvantages: When the measurement medium is highly volatile, the radar level gauge will have a large measurement error in the measurement, and it is not suitable for the liquid level measurement of this type of medium; when the measurement medium needs to be heated, or is easy to produce Condensation may occur on the surface of the radar antenna, which directly affects the measurement accuracy of the radar level gauge; necessary installation and treatment measures need to be considered; when the structure in the storage tank is complex, it is necessary to consider installing the necessary guide pipe , to reduce the measurement deviation; when the liquid level of the storage tank is low, there may be a low liquid level measurement blind area (or a decrease in measurement accuracy); the measurement principle of the servo liquid level gauge: mainly based on the Archimedes principle, and adopts high precision The force sensor, high-precision servo motor system and measuring drum measure the change of steel wire tension caused by the increase or decrease of the buoyancy of the float, and the controller issues instructions, and the servo motor drives the measuring drum to rotate at a certain pace, and Drive the float to continuously track the change of the liquid level. At the same time, the counter records the number of rotation steps of the servo motor, and automatically calculates the displacement of the measuring float, that is, the change of the liquid level. Measuring medium: The main application objects are light oil products and most chemical products, especially volatile product media. Installation tank type: suitable for various types of storage tank liquid level and most of the measuring medium, and can be applied to a wide range of medium pressure and temperature. Advantages: Not only can it measure the liquid level of the medium, but it also has the functions of density measurement, oil-water interface measurement, average density and density distribution measurement of the medium. Disadvantages: When the measurement medium has high viscosity, wall-hanging and sticky characteristics, the servo level gauge will have large measurement errors in measurement, and it is not suitable for liquid level measurement of such media.

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