Radar level gauge installation requirements

In our automation industry, when it comes to radar level gauges, I believe everyone is familiar with it. The radar level gauge adopts a non-contact measurement method, and has irreplaceable advantages in the fields of dust material, volatile liquid, and pressure vessel level measurement.　　Advantages in the use of radar　　One. Continuous and accurate measurement　　 Because the radar level gauge is not in contact with the measured medium, and it is very little affected by temperature, pressure, gas, etc.　　 2. Convenient maintenance and simple operation 　　 The radar level gauge has fault alarm and self-diagnosis functions.　　三. Wide application range 　　 non-contact measurement, good directivity, low transmission loss, and more measurable media.　　4. Simple installation　　In various industry applications, the radar level gauge can be directly installed on the top of the storage tank. The advantages of simple installation and other advantages have become the first choice for the general public. Next, let's talk about the problems often encountered in the process of use.　　Pay attention to the specifications for installation.　　The radar level gauge measures the liquid level of the tank at 1/4 or 1/6 of the diameter of the tank, and the minimum distance from the pipe wall is 200mm.　　Note: ①Datum surface ②The center of the vessel or the axis of symmetry 　　 measuring cone-shaped tanks should be installed in the middle of the plane of the cone-shaped tanks to ensure that the cone-shaped top can be measured.　　 When measuring tanks with piles of material, when selecting the type, you should choose the universal flange (adjustable direction) to install the radar level gauge. Due to the inclined fixed surface, the echo will be attenuated and even the signal will be lost. So when we install it, we adjust the radar antenna to align it vertically with the material surface.　　Summary of typical wrong installation methods　　Next, I will share with you some typical wrong installation methods that we often encounter, so that everyone is more comfortable in debugging and installing radar.　　 1. Close to the feed inlet 　 　 often meet friends who have just come into contact with the radar, during the installation process, the installation position of the radar is too close to the feed inlet, resulting in inaccurate liquid level measurement during use. Since it is close to the feed port, the feed will greatly interfere with the propagation and reflection of the radar medium, so when we install it, we should try to stay away from the feed port (the following installation 1 is correct, 2 is wrong) 　　 2. Round tank The radar level gauge in the middle is a non-contact level gauge. Due to the beam angle, it should be installed as far away as possible from the pipe wall, but it needs to be installed in a circular or arched tank (as shown in the figure below). The position cannot be installed in the middle of the top of the tank. In addition to indirect echoes during normal measurement, it will also be affected by multiple echoes. Multiple echoes may be larger than the signal threshold of true echoes, because multiple echoes can be concentrated through the top. Therefore, it cannot be installed in a central location. 3. The radar insertion depth is not enough. The third situation I believe you have encountered more. We need to weld and short-circuit at the site during installation, but we often do not pay attention to the requirements for the length of the short-circuit, thinking that it is just fixed It works, and everything will be fine under random welding, causing the radar level gauge probe to still be short-circuited, resulting in inaccurate liquid level measurement. The displayed liquid level is much larger than the actual value and does not change with the height of the liquid level. Therefore, we must pay attention at this time. After the radar level gauge is installed, the probe must extend into the tank with a distance of at least 10mm to ensure the normal operation of the radar level gauge.

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