公开(公告)号：US20220057351A1

公开(公告)日：2022-02-24

申请号：US17434339

申请日：2020-02-26

Applicant: GRUNDFOS HOLDING A/S

Inventor： Gert Friis ERIKSEN ,  Jørgen JENSEN

IPC: G01N27/02 ,  F04D13/06 ,  F04D15/00 ,  F04D15/02 ,  G01N33/28

Abstract: A pump device has at least one chamber (22) or conduit containing or provided for containing a liquid, a concentration sensor (24) arranged in the chamber (22) or conduit for detecting a concentration of a substance in the liquid and an evaluation unit (28) connected to the sensor (24). The sensor (24) and the evaluation unit (28) are configured for an electrical impedance measurement. The evaluation unit (28) is configured such that a measurement for detecting the concentration is carried out by use of an electrical signal applied to the sensor (24) having at least one frequency corresponding to or above an upper cut-off frequency (f2) of a frequency range showing a constant electrical impedance (Rm). A method is provided for determining the concentration of a substance inside a liquid.