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When using guided-wave radar level gauges to measure foamy liquids or in applications such as mixing tanks, installing a guided wave tube or bypass tube at the probe can effectively prevent obstacles, foam, and fluctuations in the liquid level inside the container from affecting the measurement accuracy. Typical operating conditions in which the use of waveguides or bypass pipes is recommended include: 1. Situations where conductive foam is present ； 2. Conditions with severe fluctuations in liquid level ； 3. There are many obstacles at the installation location ； 4. Liquid level measurement in internal floating roof tanks (such as certain media in the petrochemical industry) ； 5. The dielectric constant of the medium under test is too low. It should be noted that for media with too high viscosity, it is not advisable to use waveguides or bypass tubes for measurement. The technical requirements for the guided wave radar level gauge regarding the guided wave tube or bypass tube are as follows: 1. The guided wave tube or bypass tube must be made of a conductor ； 2. The inner diameter of the pipe should not be less than 50 mm ； 3. The pipeline must be installed vertically ； 4. The inner wall of the pipeline should be smooth, without large welds or cracks; the surface roughness should be better than 0.1 mm ； 5. The inner diameter of the pipeline should be uniform, with any variation not exceeding 1 mm ； 6. The bottom of the waveguide must remain open ； 7. When installing the waveguide, equal-pressure holes with a diameter of 5 mm to 10 mm should be provided above the highest point that the liquid level may reach ； 8. When there are multiple types of liquid mixed together in the container, multiple guide holes or guide tubes should be installed to facilitate free flow of the liquids between the tank and the pipes ； 9. In cases where a stratified mixture of liquids is present, the distance between each guide hole or guide tube must be less than the minimum stratification thickness ； 10. When installing the bypass pipe, the position of the top equalizing pipe should be above the possible highest level of the liquid in the tank ； 11. When installing the bypass pipe, the position of the bottom guide pipe should be below the lowest possible level of the liquid in the tank. Xi’an Dinghua Electronics Co., Ltd., established in 1992 and currently located in Xi’an, Shaanxi Province, is a high-tech enterprise that specializes in the research and development, production, sales, and engineering services of radar level gauges. At present, the company offers a range of products including radar level gauges, external liquid level meters, fork-type level switches, electro-hydraulic actuators, ultrasonic flowmeters, and external thermometers. All of these products have withstood numerous complex operational conditions in real-world settings, and they are widely used in industries such as petroleum, chemicals, power generation, coal mining, metallurgy, as well as food and pharmaceuticals. Professional selection guidance, excellent product quality, reasonable prices, fast delivery times, and comprehensive pre-sales, in-sales, and after-sales services…