... <1>.Roots flow meter short called lumbar round flow meter .It is mainly using in the liquid flow in pipes and ... cumulative flow, instantaneous flow, a single flow and so on. It can also be output pulse Signal 4-20mA, or 1 ... ,MODBUS agreement. It is widely used in petroleum, chemicals, electric power, metallurgy, transport, food processing, medicine, national defense, business and trade sectors ...