Avoid pitfalls! Key points for selecting radar level gauges – know them in advance

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Radar level gauges are widely used in various industrial applications thanks to their unique advantages and characteristics. However, since each industry has different measurement requirements, its application range spans from simple storage containers of various capacities to complex reaction vessels equipped with multi-stage mixing devices and heating coils. Therefore, when selecting a radar level gauge, there are many aspects that need to be considered correctly; if the selection is improper, the measurement accuracy will be significantly reduced, or even the gauge may stop working altogether. This article introduces the considerations for selecting radar level gauges. 1. Measure the temperature of the medium ； The temperature range for measurement with conventional radar level gauges is from -40 to 130 degrees; the radar level gauge can operate properly when the medium is within this temperature range. When the temperature is below -40 degrees, it prevents the LCD screen from functioning properly ； When the temperature is above 130 degrees, a high-temperature type is required. The high-temperature type has a temperature range of -40 to 250 degrees ； When the temperature is above 250 degrees, it is necessary to add a nitrogen purge function. 2. Measure the pressure of the medium ； The measurement pressure range of conventional radar level gauges is -1 to 4 MPa; those requiring operation outside this range need to be custom-made, with a maximum pressure capacity of up to 10 MPa. 3. To measure the physical properties of the medium, it is necessary to determine these properties, including the medium’s corrosiveness, its tendency to stick, and whether it will crystallize, among other things. The selection requires choosing different models based on specific physical properties. 4. Process connection specifications: It is necessary to specify the exact process connection requirements for the tank. If threaded connections are used, the radar level gauge must be equipped with threaded connections (the maximum pressure for threaded connections is 0.3 MPa) ； In the case of flange connections, it is necessary to determine the exact flange specifications; only once the flange specifications are known can the appropriate antenna size be selected for the radar level gauge. Inaccurate flange specifications can result in the inability to install the instruments at the site. 5. Mixing specifications inside the tank: When mixing is carried out inside the tank, it is necessary to determine the specific mixing specifications, including the number of fan blades, the distance between the fan blades and the tank walls, and the radius of the fan blades, among other parameters. When installing a radar level gauge, it is advisable to avoid the impeller blades as much as possible to achieve accurate measurement results. 6. Connection pipe height of the flange: The exact dimension of the connection pipe height of the flange must be determined, as when installing the radar level gauge, the antenna needs to extend into the tank; in other words, the length of the radar antenna must be greater than the connection pipe height. If the length of the radar antenna is less than the height of the pipe, the measurement accuracy will be reduced. 7. The range of the tank: The range of the tank is a parameter that directly affects the accuracy of the instrument, and it must be determined accurately.