公开(公告)号：US20240209847A1

公开(公告)日：2024-06-27

申请号：US17626169

申请日：2020-06-12

Applicant: EPPENDORF SE

Inventor： Matthias Arnold

IPC: F04B49/22 ,  F04B43/00 ,  F04B43/073

CPC classification number: F04B49/22 ,  F04B43/0081 ,  F04B43/073

Abstract: A control arrangement and method for controlling a sensor-free diaphragm pump are disclosed. The control arrangement comprises a control-fluid inlet for connection to a first control-fluid reservoir having a pressure level which is elevated in relation to a reference pressure, a control-fluid outlet for connection to a second control-fluid reservoir having a pressure level which is reduced in relation to a reference pressure, a control-fluid connection for connection of a control-fluid line for the sensor-free diaphragm pump, wherein the control-fluid inlet is connected via a first proportional valve to a collecting point, and the control-fluid outlet is connected via a second proportional valve to the collecting point, wherein a mass flow sensor is arranged between the collecting point and the control-fluid connection. A control unit is in signal communication to the first proportional valve, the second proportional valve and the mass flow sensor.