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how to calibrate RF type capacitive level transmitter?
Most of these have self-calibrating features. What is your make, model/type?
The same way, as any other type of level transmitter, by charting its output against known levels. A manufacturer ought to deliver it with the sensor, and you should have it. If selfcalibrated - as Ioshi mentions - you should know it too by now.
Level transmitter or Level switch?