SHLT (smart) flange type capacitive level transmitter can carry on accurate measurement of level and density for all kinds of containers. It is a kind of pressure level sensor .Flush flange and extended flange available, 3" or 4", 1501b or 3001b flange, custom-made flange option. Visit here https://www.silverinstruments.com/product/level-measurement/capacitance-level-transmitter.html