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One customer is doing sludge incineration and using this to generate electricity. On our sludge fermenter, we installed four Changjiang series CJ-6053 flare radars. The connecting flange is DN200, and the height of the tank is 17 meters. It was normal in summer and autumn. In the winter, the following conditions occurred: the sludge was not full, the radar showed full scale, and then the correct sludge height was measured over time. We initially judged that when the full scale occurred, it was because of the signal intensity reflected from the sludge. There was no signal intensity near the bell mouth, and the radar used the signal near the bell mouth as sludge.
The solution is to make a false echo storage in the vicinity of the speaker port on the radar software.
At the scene, we connected with a laptop via the hart communicator. The data measured by the first radar is correct. The height of the flange to the sludge surface is 1.74 meters. See the echo map measured by the radar like this: 
It can be seen from this echo map that there is no false echo storage inside the radar. The height of the sludge reflection is now the peak of the red protrusion. Then enter the false echo storage, which is called "pseudo echo storage." 
Double-clicking on this interface will bring up a dialog box "Edit Manual Adjustment". 
Here, the initial value is filled in with 0.00, and the ending value is filled in 0.70 m. Fill in the range to 100. Then select "Add". After the addition is complete, select "Exit". In doing so here, the meaning is that from the beginning of the antenna to the distance of 0.70 meters, the amplitude of the reflected signal is less than 100dB, both as false echoes, not as real echoes. In this case, if the sludge reflection signal between 0.70 m and the bottom of the can is lower than the reflection signal within 0.70 m, the radar will not use a reflection signal with a high intensity of 0.70 m or less. Thereby ensuring the correct measurement of the sludge.
After exiting “Edit Manual Adjustmentâ€, the “Pseudo-Echo Storage†menu interface appears as shown in the figure below. At the junction of 0.70 m and 100 dB, there is a horizontal red line. 
At this point, the problem of full scale measurement sometimes is solved.
This method can also be used to have an obstacle in a certain middle part of the can, for example: the height of the can is 10 meters, there is a bump or bracket at 4 meters, the whole height is 0.3 meters, in order to avoid the impact on the measurement , you can use the above method to solve.
For example, fill in the "edit manual adjustment": the starting value is 4.40 meters, the ending value is 3.95 meters, and the amplitude value is 100dB.
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Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
How to deal with the full scale problem of the Yangtze River CJ-6503 low frequency radar level gauge