What should I do if the radar level gauge is inaccurate?

1 Error in measurement value This is a common failure. Traditional rope measurement methods are used to measure actual overhead distances. If there is no difference between the measured value and the distance displayed by the instrument, it proves that there is no problem with the quality of the instrument itself. According to the working principle of the radar level gauge, the actual liquid level can be obtained by subtracting the distance from the measurement reference point to the medium surface from the distance of the empty tank. Therefore, the height of the empty can must be accurate to ensure the accuracy and reliability of the measurement. Therefore, field measurements must be carried out before calibration to obtain more realistic data. If the meter is connected to a computer system, check that the meter's full-scale parameters and computer configuration data are correct. 2 The measured value is obviously distorted. When the liquid level changes, the measured value of the fault does not change. The gauge maintains an apparent false level when the tank is empty or full, or shows a lower value when the tank is full. These failures are usually caused by the following reasons: (1) The antenna is crusted. Thick, wet scars strongly reflect microwaves, keeping the instrument's measurements at a constant high level value. (2) When the material is emptied, the antenna or nearby condensation can produce disturbing echoes. (3) When the material is emptied, the fixed components in the tank will produce strong echoes. In the above situation, the following measures should be taken to solve the problem: Carefully clean the antenna and accessories near the antenna. Perform 'Fixed Component Echo Suppression'. In addition to intelligent filtering of interference echoes by software, the radar level gauge can also resist the echoes of fixed components by recording the interference waves. When the material in the tank is nearly full, the meter will display a lower material level, which is caused by the increase of multiple echoes in the tank due to the rising liquid level. In the process of program processing, a beam of echoes that propagated for a long time is mistaken for the measurement echoes, so as to calculate a larger overhead distance. In this case, the near-field suppression distance should be modified to eliminate the effects of multiple echoes. 3 The measured value fluctuates in the tank. Due to the violent fluctuation of the surface of the stirring medium or the material feeding, the temporary disturbance echo in the tank is strengthened, resulting in the fluctuation of the measured value. In addition to improving the application parameters (activating the floating-point average curve algorithm), activating the near-field suppression, and increasing the output damping, you should also check the installation location of the instrument or install a larger antenna.

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