Level measurement is often required in vessels with agitation in the chemical, pharmaceutical and food industries. Traditional level meters are prone to errors in stirred conditions, but radar level meters can break through this challenge. In this paper, we will introduce the measurement principle of radar level meter in stirred conditions and present two actual measurement cases.

The radar level measurement working principle in a vessel with agitation is to measure the level height by the time difference between the radar wave and the reflected wave. When the radar wave comes into contact with the level surface, it is reflected and the radar level meter determines the level height by calculating the time between the radar wave being emitted and being reflected back. In a vessel with agitation, the radar level meter can also be adjusted to different water depths, level changes and agitation intensity by adjusting the beam angle and scanning frequency.

A pharmaceutical company needed to monitor the level of a mixture in a reactor in real time. The traditional level meter is prone to errors when the reactor is under the influence of stirring, so the company chose to measure with a radar level meter. Before the actual measurement, the company's technicians first installed a radar level meter on the top of the reactor. Because the monitored liquid would change during the stirring process, they adopted a dynamic calibration method during the calibration, i.e., they continuously adjusted the calibration parameters of the radar level meter during the stirring reaction to ensure the accuracy of the monitoring data. The results showed that compared with the traditional level meter, the radar level meter was still able to measure the liquid level accurately and the radar level measurement data had a certain stability when the stirring was very strong.

In the storage tank of a chemical company, the material is in extruded form and also the tank is equipped with an agitator. It is difficult for the traditional level meter to measure the level of the material. In order to solve this problem, the company adopted radar level meter. Due to the dense material, in the traditional level meter, the signal transmission path in the material will be distorted and deformed due to the extrusion of the material, making the signal disturbed and leading to distorted measurement results. Therefore, the company uses radar level meter to effectively avoid the signal interference and noise caused by material extrusion by measuring the minimum reflected signal below the zero point. In addition, in order to ensure the accuracy of the measurement, the company calibrated and adjusted different parameters for each tank and added several mounting points with "sentry devices" on the tank wall to ensure the reliability and stability of the measurement parameters.

In general, the reliability and stability of radar level meter in measuring level with stirring conditions is better than traditional level meter. In practical application, we need to consider various factors such as demand, environment, liquid nature, etc., to choose a suitable radar level meter and do the installation, commissioning and calibration work to ensure the accuracy and reliability of measurement results. At the same time, in the process of liquid stirring, millimeter level fluctuations may also interfere with the precision measurement, so attention needs to be paid to the selection of appropriate filtering and error correction algorithms to process the data in order to eliminate the level fluctuations and interference.