Device for controlling volumetric flow of liquid used in e.g. sewage treatment plant, adjusts auxiliary pressure generated by auxiliary pressure sensor through gas line between regulated gas pressure generating and tracking units

摘要

The device comprises a regulated gas pressure generating unit that contains a measuring unit for measuring the flow of gas passing through a gas line (5). The gas pressure (pG) is controlled by a control unit (25) based on indirectly measured gas flow rate corresponding to the setpoint value. An auxiliary pressure sensor (27) is provided to generate auxiliary pressure via the control unit, while adjusting through gas line between the regulated gas pressure generating unit and a unit (1) for tracking gas pressure at a standard value time. An independent claim is included for method for controlling volumetric flow of liquid.