Method and system for treating industrial process fluids

A fluid treatment system for treating an industrial process fluid used in a system to which the fluid treatment system can be connected, said fluid treatment system comprising:

• a first fluid connector configured to be connected to an outlet provided in the system, said first fluid connector being configured for receiving the industrial process fluid into the fluid treatment system;
• a second fluid connector configured to be connected to an inlet provided in the system for returning the industrial process fluid after treatment in the fluid treatment system;
• a first fluid path arrangement which is fluidly connecting the first fluid connector and the second fluid connector, wherein said first fluid path arrangement includes,
• a first pump configured to pump the industrial process fluid from the first fluid connector to the second fluid connector, and
• a sensor device which is connected in the first fluid path arrangement such that it receives at least a part of the industrial process fluid pumped by the first pump, wherein said sensor device is configured for measuring a concentration of an industrial process fluid concentrate in the industrial process fluid;
• and
• a second fluid path arrangement which is provided in connection with an inlet of the sensor device, wherein said second fluid path arrangement includes,
• a third fluid connector configured to be connected to an industrial process fluid concentrate tank,
• whereby the fluid treatment system is configured to provide the industrial process fluid concentrate from the industrial process fluid concentrate tank via the second fluid path arrangement and via the sensor device in the first fluid path arrangement and further via the first fluid path arrangement to the second fluid connector for addition to the industrial process fluid used in the system,
• wherein said fluid treatment system further comprises a control system, whereby the control system is configured to control the fluid treatment system to add an amount of the industrial process fluid concentrate via the second fluid path arrangement and via the sensor device to the system in order to maintain a predefined concentration level of the industrial process fluid concentrate in the industrial process fluid used in the system, wherein said amount is calculated based on the concentration measured in the sensor device,
• wherein the adding of the amount of the industrial process fluid concentrate to the industrial process fluid used in the system includes controlling the fluid treatment system for cleaning the sensor device at certain time intervals to let at least a portion of the amount of the industrial process fluid concentrate pass into the sensor device and keep at least the portion of the amount of the industrial process fluid concentrate in the sensor device for a certain time period to clean the sensor device.