System and method for regulating and measuring flow

A system for regulating the flow of an ink in a graphic process, including:

• a reciprocating positive displacement pump connected to a first container via a first liquid conduit and to a printing module in a graphic printing machine via a second liquid conduit, the pump is configured for pumping an ink from the first container and to the graphic printing machine, and wherein the viscosity of the ink affects operation of the pump;
• a sensor connected with the pump and configured to measure at least the pump strokes in the pump;
• and
• a controller connected with the sensor and configured to analyse the data from the sensor and determine the number of the pump strokes over a predetermined period of time (T1);
• wherein
• the controller is configured to determine the viscosity of the ink based on the measured number of pump strokes in the pump;
• the controller is configured to generate a control signal from the measured/determined viscosity;
• and
• the system includes a dosing unit configured to receive the control signal from the controller and to add a predetermined amount of a diluent from a second container into the first container holding the ink for regulating the viscosity of the ink.