0422f Flow Measurement Open Channels Flow measurement devices using parabolic plate orifices and ultrasound on fixed and movable weirs with compatible electronic and hydro-mechanical accessories.
0422r Flow Measurement in Full and Partly-full Pipes Magnetic-inductive flow meters assisted by high-frequency ultrasonic Doppler measurement to measure flow in partly-full and full pipes (culverts).
0423 Water Level Measurement in Stormwater Tanks Water level measurement devices for all CSO facilities using ultrasound, suspended hydrostatic gauges or air bubble injection procedures.
