Product forming system with electrically heated mould, including measurement device for measuring current, and method

Method for measuring electric currents flowing through electrical resistors of a product forming system, wherein the product forming system comprises:

• an electrically heated mould of which at least one mould part is provided with a plurality of electrical resistors for heating a cavity inside the mould, means for applying electric current to the electrical resistors, and a measurement device for measuring the electric currents flowing through the electrical resistors,
• wherein the measurement device is integrated on the mould part and comprises a plurality of openings, wherein at least one electrical conductor runs through each opening, each of which is connected in series to at least one of the electrical resistors,
• wherein an inductive element is provided at each opening for measuring the electric current through the respective at least one electrical conductor, and wherein the measurement device comprises electronic components for converting the measured currents into measurement data and storing and/or transmitting the measurement data;
• and wherein the method comprises the step of controlling the measurement device, which is integrated on the mould part, to perform a current measurement at least at the beginning and/or the end of each production cycle.