1>variable area flowmeters 2>kinds:needle indication,4-20mA output,LCD display 3> ... ,restrict alarm and many kinds of signal,compared with other flowmeters,this series has the characteristics of high-pressureproof,high-temperature ... the indicator.indicator porameterSpecification DN(mm)Measure RangePressure Loss(Kpa) Water(L/h)Air(Nm3/h)Orifice PlateCone Pipe Normal TypeCorrosion ...