Need help for solid level sensor

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FvM said:
That's in fact a very rugged measurement. Externet mentioned an automated variant, using a motor. Similar methods are used in industry e.g. for tanks with layered liquids, or liquids covered with foam.
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As usual, this rice level measurement is a demanding application. I have tested ultrasonic sensors as well as RF and microwave ones, so I recommend what I know will work best . As no accuracy was explicitly mentioned, nor the silo size, rice moisture and technical details like pouring rice on or off-axis, you will have to experiment. Ultrasonic distance meters are the lowest-cost devices, and I am sure they will work well. You can test laser ones, strain gauges on silo bottom or weight sensors; all combined may offer the best result, and by such experiment you can find the best solution for your particular situation.
 

So now its up to newbex we will have to wait for his feed back on all our posts.
 

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