How to correctly select the radar level meter

　　What type of radar level meter should be selected based on the physical and chemical properties of the fluid medium being measured? The diameter, flow range, lining material, electrode material and output current of the radar level meter should be able to adapt to the properties of the fluid being measured and the requirements of flow measurement.

　　1. Check the accuracy level and function of the precision function. Select the accuracy level of the instrument according to the measurement requirements and the occasion of use to achieve economical and cost-effectiveness. For example, for occasions used for trade settlement, product delivery and energy measurement, a higher accuracy level should be selected, such as 1.0, 0.5, or higher; for occasions used for process control, different accuracy levels should be selected according to the control requirements; some occasions just detect the process flow, without the need for control and measurement, you can choose a slightly lower accuracy level, such as 1.5, 2.5, or even 4.0, then you can choose a low-cost insertion radar level meter.

　　2. Measurable medium: When measuring medium flow rate, instrument range and caliber, the full flow rate of the radar level meter can be selected within the range of 0.5-12m/s, which is a relatively wide range. The instrument specification (caliber) is not necessarily the same as the process pipeline. It should be determined based on whether the measured flow range is within the flow rate range. That is, when the pipeline flow rate is low and cannot meet the requirements of the flow meter or the measurement accuracy cannot be guaranteed at this flow rate, it is necessary to reduce the instrument caliber to increase the flow rate in the pipe and obtain satisfactory measurement results. When purchasing and selecting a radar level meter, it is very critical to choose based on which factors.

　　The ultimate product use purpose of the radar level meter is to obtain a reflected wave on the surface of the material being measured, but at the same time there is no influence of other interference waves or the interference waves are very small. According to its purpose, two conclusions can be drawn: one is the impact of the environment in the path of electromagnetic wave transmission; the other is the impact of the state of the measured material surface on the reflected signal. The specific details are that if the electromagnetic wave emitted by the radar level meter contacts an obstacle, an ultrasonic level meter interference waveform will be obtained accordingly. When other ideal installation locations cannot be selected, the solution to the installation location problem is to select an instrument with a small beam angle or to use a waveguide or bypass pipe installation form.

　　The measurement of radar level meter has a great relationship with the dielectric constant or hardness of the measured material. The dielectric constant affects the strength of electromagnetic wave reflection. The larger the dielectric constant, the stronger the reflected echo; hardness refers to the reflection of sound waves. The larger the hardness, the stronger the reflection of sound waves. In addition to dielectric constant and hardness, the measurement parameters are also related to the stacking angle of the measured material surface, the stability of the measured material surface, the particle size and looseness of the measured object, and the wettability of the measured object.

　　The basic parameters of the radar level meter should be noted as follows when selecting: Operating frequency: 6.8GHz Beam angle: 24°TX801, TX802 20°TX803 with DN150 flange 16°TX803 with DN200 flange 14°TX803 with DN250 flange Measuring range: 0~35m Repeatability: ±2mm Resolution: 1mm Sampling: echo sampling 55 times/s Response speed: >0.2s (depending on the specific use) Current signal: 4~20mA Accuracy: <0.1% Pay attention to the main parameters of product performance when selecting. When the radar level meter is reflected by the measured material surface, an identifiable echo signal can be obtained. With the end of the process of wave transmission, reflection and retransmission. In this process, all possible problems are taken into consideration, prevented in advance, and better product parameters are selected, and the corresponding selection can be completed.