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Analysis of common causes of inaccurate radar level gauge measurements
Time：
2026-04-10
Radar level gauge, with their advantages of non-contact operation, high precision, and strong adaptability, are widely used in level measurement in industries such as chemical, power, and water treatment. However, in practical use, users sometimes encounter situations where the measured values fluctuate, jump, or are significantly inaccurate. The causes of this problem usually involve several aspects, including media characteristics, installation conditions, environmental interference, and instrument malfunctions.
I. Influence of Media Characteristics The dielectric constant of the measured liquid is a key parameter in radar measurement. When the dielectric constant of the medium is too low (e.g., liquefied gas, light oil, ε<1.5), the radar wave reflection signal is weak, easily leading to echo loss or misjudgment. Furthermore, liquid surface fluctuations and foam layers can absorb or scatter radar waves, making it impossible for the instrument to stably track the true liquid level; while highly viscous media may accumulate or crystallize at the probe or antenna, further attenuating the signal.
II. Improper Installation Conditions An unreasonable installation location is one of the most common errors in the field. If the instrument is installed directly above the tank's inlet, liquid splashing during feeding will interfere with the echo; being too close to the tank wall may introduce false echoes reflected from the tank wall. Failure to meet the blind zone requirement (insufficient distance between the antenna and the highest liquid level) will result in complete measurement failure once the liquid level enters the blind zone. Additionally, obstacles such as agitators, heating coils, and ladders within the tank can generate strong interference echoes, causing the instrument to mistakenly lock onto the wrong target.
III. Environmental and Process Changes Drastic fluctuations in temperature and pressure can alter the propagation speed of radar waves. Although most instruments have built-in compensation algorithms, errors will still be introduced when these fluctuations exceed the design range. Steam, dust, and liquid droplets condensed on the horn antenna will also weaken the signal strength. For corrosive media, aging or corrosion of the antenna seals and damage to the internal circuitry will also cause measurement anomalies.
IV. Instrument Parameter Settings and Faults Incorrect parameter configurations (such as incorrect tank height, empty tank value, or dielectric constant threshold) will lead to incorrect conversion relationships. Furthermore, aging of the radar module, power supply, or signal output circuitry can also cause drift or intermittent readings.
Conclusion Solving the problem of inaccurate radar level gauge measurements requires a step-by-step investigation of the on-site installation, media characteristics, process environment, and instrument settings. Proper installation, regular antenna cleaning, proper threshold setting, and the use of waveguide-equipped or high-temperature/high-pressure-specific models can significantly improve measurement reliability. When problems occur, observing the echo curve using an oscilloscope or handheld device is an effective way to locate the source of interference.
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