Installation points of radar level gauge

1) When measuring liquid materials, the axis of the sensor is perpendicular to the surface of the medium; when measuring solid materials, the radar level gauge should be tilted at a certain angle because the solid medium will have a pile angle. (2) Try to avoid devices that cause false reflections within the emission angle. In particular, it is necessary to avoid obstacles in the 1/3 cone-shaped emission area closest to the antenna (because the closer the obstacle is, the stronger the false reflection signal is). If it is unavoidable, it is recommended to use a refraction plate to refract the excessively strong false reflection signal. This can reduce the energy density of false echoes, making it easier for the sensor to filter out false signals. (3) Avoid the feed port to avoid false reflections. (4) The sensor should not be installed in the center of the arched tank (otherwise the false echo received by the sensor will be enhanced), and it should not be installed very close to the tank wall. The best installation position is 1/2 of the radius of the tank. (5) Avoid installing in places with strong eddy currents. For example: due to stirring or strong chemical reaction, etc., it is recommended to use waveguide or bypass tube for measurement. (6) If the sensor is installed on the tube, the antenna must protrude from the tube. The horn antenna protrudes at least 10mm from the tube. Rod antennas take over lengths up to 100 or 250mm. Take over the minimum diameter of 250mm. The method of increasing the diameter of the connecting pipe can be adopted to reduce the interference echo generated by the connecting pipe. (7) Regarding the waveguide antenna: the inner wall of the waveguide must be smooth, and the bottom opening of the waveguide must reach the required minimum liquid level, so that it can be measured in the pipeline. The type plate of the sensor should be aligned with the axis of the waveguide opening. If the measured dielectric constant is less than 4, it is necessary to install a reflector at the end of the waveguide, or bend the end of the waveguide into a curvature to refract the reflected echo at the bottom of the container.

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