The difference between radar level gauge and servo level gauge

Measuring principle The servo level gauge is mainly based on the Archimedes principle, and adopts a high-precision force sensor, a high-precision servo motor system and a measuring drum. The servo motor drives the measuring drum to rotate at a certain step, and drives the float to continuously track the change of the liquid level. At the same time, the counter records the rotation steps of the servo motor and automatically calculates the displacement of the measuring float. , that is, the change in liquid level. The radar level gauge 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 measurement of the frequency signal. , combined with pure digital processing technology to obtain liquid level measurement. The main application objects of the measuring medium servo level gauge are light oil products and most of the chemical products, especially the volatile product medium. The main application objects of radar level gauge are crude oil, heavy oil and chemical products with high viscosity. The installation of the tank type servo level gauge is suitable for various types of storage tank liquid levels and most of the measurement media, and can be applied to a wide range of medium pressure and temperature. The radar level gauge is suitable for measuring the liquid level of various types of storage tanks. Advantages The servo level gauge can not only measure the liquid level of the medium, but also has the function of density measurement, oil-water interface measurement, and the average density and density distribution of the medium. The radar level gauge is a non-contact measurement that can measure toxic media and viscous liquids. Disadvantages Servo level gauge When the viscosity of the measuring medium is high and there are wall-hanging and sticky characteristics, the servo level gauge will have a large measurement error in the measurement, and it is not suitable for the liquid level of such media. measure. 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 such media; when the measurement medium of the radar level gauge is When a product that needs to be heated or is prone to condensation, 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 it is complicated, it is necessary to consider installing the necessary guide tube to reduce the measurement deviation; when the liquid level of the radar level gauge is low in the storage tank, there may be a low liquid level measurement blind area (or the measurement accuracy is reduced);
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