Reasons for fluctuations in the measurement values of guided-wave radar level gauges
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Everyone has probably used guided-wave radar level gauges; let’s discuss the reasons for large fluctuations in their measurement values and the solutions to address them! {:2_40:}
There are too many reasons. . . . Analyze each specific issue individually. .
There are interference echoes; it’s best to analyze them using the waveform diagram. It’s hard to explain in just one or two sentences – let’s talk in private. You can find my phone number on my profile picture
You are only talking about the phenomena. 1. What form of guided wave radar. Single pole, single cable, double pole, double cable. 2. Installation location. 3. Measuring medium. Also, does this fluctuation occur when the liquid level/material level reaches a certain position, or does it occur at any position? You can get in touch with me.
In fact, the main reason is the material itself; when there is no gas phase present, the overall radar reading is quite accurate. However, once a gas phase appears, or when it’s difficult to distinguish between the liquid phase and the gas phase, that’s when problems arise
Generally speaking, there are several reasons for significant fluctuations in the radar readings from an instrumentation perspective: 1. Radar loss of signal: When the radar loses its signal, it continues to try to detect the liquid level, but failing to do so results in large fluctuations. 2. There is interference inside the radar waveguide of the tank: Irregularities and burrs in the openings within the waveguide cause noise interference (this can be determined by examining the waveform diagram). If the interference is mild, being less intense than the actual liquid level echo, it is possible to use software to mask out those interference waves. However, if the interference is significant, it is recommended to create a new installation port for the radar during major repairs, rather than using the waveguide. 3. Radar selection issue: The liquid used in the radar gauge must have a high dielectric constant, so that the radar waves are reflected strongly, resulting in better performance. However, if the dielectric constant is relatively low (such as in lubricants, chemical light oils, etc.), radar waves are easily absorbed, resulting in poor performance. It is recommended to use a servo level gauge. 4. Radar setup issue: When setting up some radar gauge software, there is an option related to the waveguide, and it is essential to choose the correct one. Some radars require the installation of a header dead zone to prevent the accumulation of condensation at the radar transmitter, as this could interfere with measurements; the dead zone serves to eliminate such issues. 5. It is recommended to choose high-quality imported brands; we have opted for Rosemont radars here, which require no maintenance after 1 year of use.