Analysis on the Causes of Radar Level Gauge Errors

The error of the radar level gauge mainly comes from the installation error, which makes the echo signal interfered, resulting in measurement error. When installing, consider the height of the tank and the size of the beam angle, and leave enough free space for the radar level gauge. When the free space left is too small, the wavelet signal will be reflected by the wall of the container, and the wave received by the antenna will be reflected twice or three times, which will interfere with the wave reflected once, and may cause errors in the measurement. The following are the possible reasons for the error in the measurement of the radar level gauge: 1. The output of the radar level gauge in the measurement of the dead zone is 4-20mA current. Due to the measured liquid itself and the probe, there are two There are two dead zones, namely the upper dead zone and the lower dead zone. The minimum distance that can be measured between the liquid level in the upper dead zone and the upper reference point is about 0.1-0.5m; the lower dead zone is at the bottom of the probe. With the change of the actual liquid level in the tank, the measurement result does not change part. 2. The error caused by the liquid to be measured When measuring the boundary, it is required that the dielectric constant of the liquid above must be 10 larger than that of the liquid below. Another situation is that when the thickness of the upper liquid level is very low, since the time used for the liquid level and the boundary level is basically the same, the two returned signals will be overlapped, which will affect the measurement result. Excessive viscosity of the liquid being measured can also cause measurement errors. The liquid has a high viscosity. Such liquid is likely to adhere to the probe, affecting the transmission of the signal and causing measurement errors. If the viscosity is higher, the dual-cable probes will be connected together. cleaning. If the liquid to be measured produces foam on the upper surface, it will also affect the measurement results. The foam generated on the upper surface due to the high fluidity of the liquid makes the microwave reflected on the surface of the foam, so the measured liquid level is higher than the actual liquid level. The upper foam layer can be removed using a stirring device. 3. The error generated by the radar level gauge itself The radar level gauge is basically not affected by environmental conditions such as pressure, temperature, and humidity, and most of the measurement errors come from on-site installation. The biggest problem of on-site installation is the inclination of the installation. When installing an inclination angle of a, set the distance from the punctuation point to the liquid surface as h, and the measured value is h/cosa, so the measured h value is higher than the actual value. value is large. The radar level gauge should be operated in strict accordance with the instructions during installation. In order to improve the measurement accuracy of the radar level gauge. Related product links: 922.html

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