Matters needing attention in the use of radar level gauge

Pay attention to the following issues when using the radar level gauge: The central axis of the transmitting antenna is kept perpendicular to the surface of the material to be measured, and the distance between the well and the tank wall is at least 30cm. The front end of the antenna horn should extend into the inside of the material tank to reduce the loss of emission energy caused by the installation of the connecting pipe and the welding between the equipment. Avoid mounting in the center of the tank as this will increase false echoes. Do not install it above the feeding port, mainly to prevent false echoes that may have a much larger amplitude than the effective echo reflected by the measured liquid surface when feeding. When measuring the liquid level of a container with a stirrer, try to avoid the vortex area formed when the stirrer stirs, so as to eliminate the attenuation caused by the scattering of microwave signals by the irregular liquid surface as much as possible. When the dielectric constant of the storage tank is less than 7, such as fiber reinforced glass, polyethylene, polypropylene or lead-free glass, etc., and the wall thickness is moderate, it can be installed outside the storage tank. If the medium storage tank is a spherical container, it should be installed in the form of a waveguide or a bypass pipe, which can eliminate the interference of multiple echoes caused by the shape of the container. Improve the signal-to-noise ratio. When measuring mediums with small dielectric constants (such as liquefied petroleum gas, gasoline, diesel oil, transformer oil, etc.), because these mediums will have a relatively large attenuation of microwaves, in order to increase the reflected energy and ensure the measurement accuracy, a conductor should also be used. Wave tube installation. When selecting a model, the specific conditions of the material to be tested should be fully considered. Select the corresponding connecting flange according to the process pressure and temperature: determine the antenna size according to the range and the dielectric constant of the medium, shaking or vortex and foam, etc. The larger the range and the lower the dielectric constant, the larger the antenna size should be; If the measurement occasion is highly corrosive, a rod antenna measurement system coated with PTFE should be used; if the measurement occasion is high temperature (over 200°C) and high pressure, the high temperature type and high pressure type with antenna extension tube should be selected; if the medium If it is easy to condense, you can choose the rod antenna system with shielding tube; for the food utensils and sanitary industries, there are also hygienic products to choose from.

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