Patent ID: 8521442

Claim:
A method for measuring an electrical resistance (R) and/or electrical conductivity (G) of a solution with a measurement device having at least one measuring cell, which is in contact with the solution and which is connected via a connecting cable to a processing unit, the method comprising: applying a first alternating current (i) of a substantially rectangular shape and of a first frequency to the measuring cell by a current source; measuring, by the processing unit, a first voltage (V 1 ) of the measuring cell in response to the first applied alternating current; applying a second alternating current (i) of a substantially rectangular shape and of a second frequency different from the first frequency to the measuring cell by the current source; measuring, by the processing unit, a second voltage (V 2 ) of the measuring cell in response to the second applied alternating current; determining, by a calculation unit, the electrical resistance (R) and/or the electrical conductivity (G) of the solution, from the measured voltages (V 1 , V 2 ) of the measuring cell, by solving an equation which accounts for a capacitive effect of the connecting cable, wherein a ratio (n) between higher frequency (f H ) and a lower frequency (f L ) of the first and second frequencies is n=f H /f L and is between 1.20 and 4.