(1) When using a guided wave radar level gauge to measure liquid materials, the sensor's axis should be aligned vertically with the surface of the medium. However, when measuring solid materials, the material tends to form a pile at a certain angle. In this case, the sensor should be installed at an appropriate angle to ensure accurate signal reflection and avoid measurement errors.
(2) It is crucial to avoid any devices that may cause false reflections within the emission angle of the radar. Specifically, obstacles should not be placed within the first 1/3 of the cone-shaped emission area near the antenna, as closer objects tend to generate stronger false signals. If avoidance is not possible, it is recommended to use a refractive plate to weaken the intensity of these false echoes. This helps the sensor distinguish between real and false signals more effectively.
(3) The installation location should also avoid areas where feed inlets are located, as they can create unwanted reflections that interfere with the measurement accuracy.
(4) To ensure optimal performance, the sensor should not be installed in the center of an arched tank, as this can amplify false echoes. Similarly, it should not be placed too close to the tank wall. The ideal position is at approximately half the radius of the tank, providing a balanced and stable measurement environment.
(5) Guided wave radar level gauges should not be installed in areas with strong turbulence, such as those caused by stirring or vigorous chemical reactions. In such cases, it is advisable to use a waveguide or bypass pipe for more reliable measurements.
(6) If the sensor is mounted on a pipe, the antenna must extend beyond the pipe’s opening. For a flared antenna, it should protrude by at least 10mm. A rod antenna should extend up to 100 or 250mm, depending on the application. The接管 (take-over) should have a minimum diameter of 250mm. Increasing the diameter of the take-over can help reduce interference from echo reflections, improving measurement accuracy.
(7) For waveguide antennas, the inner surface of the waveguide must be smooth to prevent signal distortion. The waveguide should extend to the required minimum length below the opening to ensure proper measurement inside the pipeline. The sensor’s type plate should be aligned with the axis of the waveguide opening. If the dielectric constant of the measured material is less than 4, a reflector should be installed at the end of the waveguide, or the end should be bent to redirect the bottom reflections, ensuring accurate signal detection.
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