【2025 Level Gauges】Precautions for Installing Radar Level Gauges
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1. When installing a radar level gauge, it should be placed away from the feed inlet, feed curtain, and vortices, as the liquid injected there 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.
2. For containers equipped with agitators, the radar level gauge should not be installed near the agitator, as the stirring action 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.
3. 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 affecting 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.
The following response is for reference only. A radar level gauge is a device that emits microwaves toward the liquid level of the medium being measured via an antenna, and then determines the liquid level inside the container by measuring the time it takes for the microwaves to be emitted and reflected back. The advantages of radar level gauges are: ① no displacement, no moving parts, and contactless measurement; they are not affected by temperature, pressure, steam, mist, or dust, and are suitable for measuring the level of media with high viscosity, toxic or non-toxic sanitary-grade media, as well as corrosive media ； ② Radar level gauges have no measurement blind spots, and their accuracy (resolution) can be very high; the error in level measurement can be as low as 1 mm (and 0.1 mm in special cases), making them suitable as commercial measuring instruments.