Precautions for installing radar level gauges

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Points to note when installing a radar level gauge: First, when installing a radar level gauge, it is necessary to avoid the feed inlet, feed curtain, and vortices, as the liquid flowing in generates false echoes with amplitudes much greater than those of the effective echoes reflected by the liquid level being measured. At the same time, the irregular liquid levels caused by vortices scatter microwave signals, leading to a reduction in the intensity of the effective signals; therefore, such vortices should be avoided. 　　II. For containers equipped with agitators, the radar level gauge should not be installed near the agitator, as the agitation creates irregular vortices that can cause attenuation of the radar signal. At the same time, the blades of the stirrer can also create false echoes for the microwave signals; this effect is particularly severe when the relative dielectric constant of the object being measured is low or when the liquid level is low. 　　III. When radar level gauges are used to measure the level of corrosive or crystalline substances, in order to prevent the medium from affecting the sensor, manufacturers generally employ a design with a polytetrafluoroethylene measurement window and a separated flange structure. The temperature of these components cannot be too high; the maximum temperature for polytetrafluoroethylene is 200°C. To avoid the effects of high temperatures on the radar antenna, and to prevent crystals present on the diaphragm from interfering with the proper operation of the instrument, a safety distance of at least 100–800 mm is required between the flange face and the highest liquid level.