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The face of different media radar level meter how to choose the type

The face of different media radar level meter how to choose the type


In order to make the reading more concise and convenient, we analyze how to choose radar level meter for liquid level measurement and solid material level measurement respectively. The previous article focused on the liquid level, so this article will analyze from the perspective of solid material level, there is a stagnant area, bridging and the phenomenon of material accumulation on the bin wall when the solid material level is in and out of the material, and even the material in and out of the material will be friction with the measuring element, there will be hanging material situation. Therefore, when measuring the solids level, how to choose the type is also a problem.

Radar level meter in the measurement of bulk material level, most of the bulk material diameter is much smaller than 50mm, which is the reason why high frequency radar level meter is the best choice for measuring the level of bulk material. Measure powder material, especially the pneumatic transmission of powder material measurement although generally speaking the dust has no effect on the radar level meter, but a large amount of dust will also produce scattering, affecting the echo, then you can choose cable type guided wave radar level meter. As the microwave is transmitted in the steel cable, the dust produced by the material in the process of conveying has no effect on the measurement. In the measurement of granular or lumpy materials, the guide wave radar level meter's guide wave cable is easy to be damaged by hard materials, such a problem is encountered in limestone bin level measurement, so a high frequency radar level meter must be used, and the microwave emission angle needs to be smaller, because the higher the microwave frequency, the shorter the microwave wavelength, to ensure that the launched radar wave can be reflected back to the maximum extent on the rough solid surface. The smaller the emission angle, the smaller the probability of forming clutter and diffuse emission.

In addition, the material surface of solid materials have a certain resting angle, and the measurement of solid material surface is basically using the diffuse reflection of radar waves on the rough surface. Microwave reflection on a rough solid surface condition and microwave wavelength surface roughness related. When the surface roughness is close to or greater than the wavelength of the microwave, the microwave will produce diffuse reflection, similar to the reflection of light waves on the woolen glass. Due to the effect of diffuse reflection, most of the microwave energy is scattered, returning only a small portion of the energy. Often this will lead to the phenomenon of lost waves, so the measurement of solid material surface, will choose to measure the same distance than the liquid surface to emit stronger microwave energy.

Whether it is liquid level measurement or solid material measurement, it will be accompanied by a variety of problems, and we have even encountered cases where a working condition combines several of the above complications, and this time requires careful observation, calm judgment, and most importantly, a certain amount of professional knowledge in order to accurately select the type, and even in the future commissioning of the instrument can be done without fail. This series will be updated here, for your reference only, specific issues need to be considered.

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