The microwave pulse energy emitted by the radar level meter is very low and very short, and the radar wave travels at the speed of light, and is transmitted and received by the antenna system. The operating time of the radar level gauge is converted into the level signal by the electronic components, and is ensured by a special time-extension method to ensure stable and accurate measurement in a very short time. There will be some interference and failure when the radar level meter is used, and many cases are caused by external influences. So how should we deal with this problem when there is an echo? The following will introduce the relevant situation of radar level meter echo, including the reasons for its occurrence. 1, if the medium is low dielectric constant, and it is easy to echo when it is at a low liquid level. 2. The measurement range of the radar level gauge is calculated from the point where the beam reaches the low point of the tank. In some specific cases, when the bottom of the tank is concave or conical, the measurement cannot be carried out when the level is lower than this point, and the echo appears. 3. In theory, it is possible for the radar level gauge to measure the position of the antenna tip, but in practical applications, taking into account the effects of corrosion and adhesion, the final value of the measurement range should be at least 100mm from the tip of the antenna.
4, for overspill protection, you can define a safety distance attached to the blind area. 5, the minimum measurement range is related to the antenna, if the medium is low dielectric constant when it is at a low level, the tank bottom can be visible, in order to ensure the measurement accuracy, it is recommended to set the zero point at a low height of C.