Working principle of radar level gauges and installation considerations
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A radar level gauge is a new type of level measuring instrument that determines the liquid level by measuring the propagation time of radar waves. A radar level gauge is a non-contact, continuous-level-measuring device that can be used to measure liquids and slurries. Radar level gauges have good adaptability to temperature and pressure, and their measurements are not affected by the volatility of the medium. Radar level gauges have low beam energy and can operate properly within the industrial frequency range, causing no harm to humans or the environment. A radar level gauge is a level gauge with extremely high accuracy and precision; it requires proper installation and use to achieve satisfactory measurement results. When installing and using radar level gauges, the following points need to be taken into consideration. The installation location of the radar level gauge must be carefully determined; it should be installed at a distance of more than 200 millimeters from the container wall. The optimal installation distance for a radar level gauge is approximately 1/6 of the container’s diameter. Radar level gauges must not be installed above the inlet pipe, nor in the center of the container; otherwise, they will receive multiple false echoes, which interferes with the reception of proper signals. During the installation of radar level gauges, if it is not possible to maintain a certain distance from the container wall due to factors such as the container’s diameter, false echoes can occur when the distance between the container wall and the radar level gauge is small. During calibration, these false echoes need to be recorded in order to avoid errors in future use. If the container in which the radar level gauge is installed is a concave or conical container, it is necessary to pay attention to the lowest point on the tank bottom that the radar beam of the radar level gauge can reach. If the liquid level is below this point, measurement becomes impossible; therefore, efforts should be made to adjust the position of this lowest point to ensure the accuracy of the measurement results.
If it is a metal tank and the liquid level is low, it is best to use a reflector at the bottom of the tank to ensure that the echo from the tank bottom is reflected to the side when the liquid level is low; otherwise, the echo from the tank bottom will be stronger than that from the liquid surface. The launch plate is a metal plate at a 45° angle to the bottom of the tank; two small pieces of it are combined to form something that resembles a small roof.
We also frequently encounter sudden changes in the readings of our level gauges these days; has installing reflectors led to any significant improvement?