HHLT (smart) flange type level transmitter can carry on accurate measurement of level and density for all kinds of containers. Level flange and insert flange are available. Flange has 3 inches or 4 inches. Specification has 1501b and 3001b flanges. We may also have flange custom-made. If not illustrate our company will provide 3-inch 1501b flange. Flange membrane materials are optional.