... wave excitation (apply to serosity measurement)Flow velocity scope: 0.1~15m/s (flow unit selectable)Connection flange: GB/T9119 ... signal: 4~20mA output, frequency/pulse, alarmHollow tube measurement: measuring hollow tube function without electrodes, continuous measurements, ... food, paper pulp, ore pulp etc.Display: Flow rate, flow, percentage, integrating flow, fault alarm etc.Supply power: 220V AC, ...