Application of Radar Level Meter in Chemical Plant

What is the principle of radar level gauge? What are the characteristics of radar level meter? The working conditions of some storage tanks in chemical production are more complicated. For example, there are many unfavorable factors for level measurement, such as a lot of dust, diffuse steam, scaling, stirring, etc., which lead to a high failure rate of the instrument, a large amount of maintenance, and difficulty in online maintenance. The cycle is short and the measurement effect is unsatisfactory. The application of radar level gauge effectively solves such problems. The following is a brief analysis of the application of radar level gauge through examples. It consists of antenna, transmitting and receiving device, signal processor, operation panel, display, alarm and other parts. 2 The working principle of radar level meter (1) Pulse technology This technology is to transmit a pulse signal from the radar head and measure the time from sending to receiving echo. This technique is fundamentally an analog technique. (2) FM continuous wave technology This technology does not measure time. The radar head emits a continuously changing frequency signal, and after the radar signal is reflected by the liquid surface, the antenna receives the echo. Since the frequency of the signal is changing, the echo is different from the frequency at the moment of transmission, and the frequency difference is proportional to the distance from the radar head to the liquid surface. FMCW technology is to measure this frequency difference, which is a digital technology. (3) Guided wave radar The guided wave radar level meter uses the TDR principle (time domain reflection principle), and the TDR generator generates an electromagnetic pulse wave that is transmitted down the probe. When the liquid surface has a high dielectric constant, the pulse wave will be reflected. The ultra-high-speed timing circuit is used to calculate the transit time of the pulse wave, and the transmission distance of the electromagnetic pulse wave is S=vt, so as to achieve accurate liquid level measurement. Features of radar level gauge (1) Continuous and accurate measurement The radar level gauge is not affected by temperature, pressure and gas, has no contact with the surface of the medium, and can quickly and accurately measure the level of different media. (2) The safety and energy-saving radar level gauge can perform accurate measurement under high temperature and high pressure. The transmitting power of the radar level gauge is only a few microwatts per square centimeter. In practical applications, the radar signal can be completely shielded by the metal outer wall. . The materials used in radar level gauges are chemically and mechanically stable and can be recycled. (4) Whether the radar signal can be reflected by the measurable medium with less limitation depends on two factors: the conductivity of the measured medium and the dielectric constant of the measured medium. All conductive media can reflect radar signals well. Radar sensors can measure all media with a dielectric constant greater than 1.5 (the dielectric constant of air is 1). Although the conductivity of the medium is not very good, it can be accurately measured. Measurement. Second, the application of radar level gauge The commonly used float steel belt level gauge is complicated to install, has low precision, and requires a lot of maintenance. Many are gradually eliminated due to long-term disrepair. The static pressure/differential pressure level gauge is installed in the tank, and some is installed with a single flange or double flange outside the tank. If the temperature and density of the medium change during measurement, it will cause a large error in the measurement results. Ultrasonic liquid level gauge is one of the most commonly used non-contact measuring instruments. The price is moderate, and it is more suitable for the measurement of corrosive liquids in catalyst tanks. However, some tanks have high temperature, large steam, some with stirring, and the liquid level fluctuates. Larger, for the level measurement of these tanks, the ultrasonic level meter does not work properly. The application situation shows that the radar level meter can realize the automatic detection of liquid level under different process conditions of various liquid media in chemical plants, which has great advantages, further improves the level of production automation, and has achieved remarkable results.
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