Radar level gauge is currently an indispensable instrument in the liquid level measurement industry. Because the radar level gauge has more advantages than the similar contact and non-contact level gauge products, it is widely used in various industry fields. The product's own advantages and measurement effects have gradually gained recognition from more and more users. Radiation level gauge measurement knowledge and matters needing attention in application Radar level gauge principle and use: 1. Measurement principle of radar level gauge: The radar level gauge adopts the emission-reflection-receiving working mode. The antenna of the radar level gauge emits electromagnetic waves. These waves are reflected by the surface of the object to be measured and then received by the antenna. The time from the transmission to the reception of the electromagnetic wave is proportional to the distance from the liquid surface. The relationship is as follows: D=CT/2 Where D is the distance from the radar level to the liquid level; C - the speed of light; T - the running time of the electromagnetic wave. The radar level gauge records the time elapsed by the pulse wave, and the electromagnetic wave transmission speed is constant, then the distance from the liquid surface to the radar antenna can be calculated to know the liquid level of the liquid surface. In practice, there are two ways for radar level gauges, namely, frequency-modulated continuous wave and pulse wave. The liquid level meter adopting the frequency modulation continuous wave technology has large power consumption and must adopt a four-wire system, and the electronic circuit is complicated. The liquid level meter using radar pulse wave technology has low power consumption and can be powered by 24VDC of two-wire system, which is easy to achieve intrinsic safety, high degree of **, and wider application range. The radar level gauge adopts pulse microwave technology. The antenna system emits a pulse beam with a frequency of 6.3 GHz and a duration of 0.8 ns, and then pauses for 278 ns. During the pause of the pulse transmission, the antenna system will act as a receiver to receive the reflected wave. The echo image data processing is performed to give an indication and an electrical signal. 2. Features of radar level gauge: The radar level gauge adopts an integrated design with no moving parts, no mechanical wear and long service life. The electromagnetic wave emitted during the measurement can pass through the vacuum, does not need the transmission medium, and has the characteristics of being free from the influence of the volatile mist in the atmosphere, the vapor and the groove, and can be used for the liquid level measurement of the volatile medium such as crude benzene. It can be used for level measurement of almost all liquids. When the electromagnetic wave is reflected on the surface of the liquid level, the signal will attenuate. When the signal decays too little, the radar level gauge cannot detect enough electromagnetic wave signal. The conductive medium can reflect electromagnetic waves well, and it can reflect enough electromagnetic waves to radar level gauges and even micro-conducting materials. A non-conductive medium having a dielectric constant greater than 1.5 (the dielectric constant of air is 1.0) can also ensure sufficient reflected waves, and the larger the dielectric constant, the stronger the reflected signal. In practical applications, almost all media can reflect enough reflected waves. Non-contact measurement is not affected by physical properties such as density and concentration of liquid in the tank. The measuring range is large, and the large measuring range can reach 0~35m, which can be used for liquid level measurement of high temperature and high pressure. Key components such as antennas are made of high-quality materials with high corrosion resistance and can withstand highly corrosive environments. Feature-rich, with a false wave learning function. Enter the actual liquid level of the liquid level, the software can automatically identify the false echo from the liquid level to the antenna, and eliminate the interference of these waves. The parameter setting is convenient, and can be set by the simple operation key on the liquid level meter. It can also be set by the HART protocol hand-held device remotely or directly connected to the communication end of the liquid level meter, which is very convenient. 3, radar level gauge installation notes: Whether the radar level gauge can measure correctly depends on the reflected wave signal. If at the selected installation position, the liquid level cannot reflect the electromagnetic wave back to the radar antenna or there is an interference object reflecting the interference wave to the radar level gauge within the range of the signal wave, the radar level gauge cannot correctly reflect the actual liquid level. Therefore, the reasonable choice of installation location is very important for the radar level gauge. Pay attention to the following points during installation: (1) The axis of the radar level gauge antenna should be perpendicular to the reflective surface of the liquid level. (2) The stirring valve in the tank, the adhesion of the groove wall and the steps and other objects, if within the signal range of the radar level gauge, will produce interference reflected waves, affecting the liquid level measurement. Choose the appropriate installation location during installation to avoid interference from these factors. (3) The horn of the horn type radar level gauge should exceed the inner surface of the mounting hole by a certain distance (>10mm). The antenna of the rod level gauge should extend beyond the mounting hole, and the length of the mounting hole should not exceed 100 mm. For round or elliptical containers, it should be placed at a distance of 1/2R from the center (R is the radius of the container), not at the center of the top of the round or elliptical container, otherwise the radar wave is on the wall of the container. After multiple reflections, they are collected at the center of the top of the container, forming a strong interference wave, which will affect accurate measurement. (4) For the liquid level measurement of containers with large fluctuations in liquid level, a level gauge with a bypass pipe can be used to reduce the influence of liquid level fluctuation. After the installation is completed, you can use a PC to observe the reflected wave curve to determine whether the level gauge is installed properly. If it is not appropriate, adjust the installation position until it is satisfactory. For interference waves that cannot be avoided in some installation positions, the level gauge can identify the interference reflected waves according to the actual liquid level and store them in the internal database of the radar level gauge, so that the radar level gauge can identify these interference waves during data processing and remove them. These interference reflected waves affect the accuracy of the measurement. 4. Maintenance of radar level gauge: The radar level gauge is mainly composed of electronic components and antennas, has no moving parts, and has few faults in use. Occasionally, the problem encountered in use is that some volatile organic matter in the sump will crystallize on the flare or antenna of the radar level gauge, and they can be checked and cleaned regularly with less maintenance. The above is about the product knowledge of the radar level gauge** and the matters needing attention in the application. I hope that the user can understand the radar level gauge after reading it, and can better apply the radar level gauge, such as the above content. Where you need to add and do not understand, you can also consult or call to communicate online.
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