These meters are based on the principal of differential pressure generated by Orifice element. Designed as per ISO5167BS1042. On line density compensation delivers very accurate results. Various Types of IBRNon IBR valves for isolation and drain. Various Sizes of Orifice Assemblies with or without IBR Certificate. Complete System is Engineered to suite your requirements. Highly Reliable and Repeatable System; No Moving Parts. Easy for Calibration.