Patent ID: 6228237
Filing Date: 2001-05-08
Classification: G01N

Abstract:
A device for automatically measuring a concentration of a developing agent in a solution, the device comprising:a voltage generator capable of generating at least one voltage ramp provided to feed a three-electrode cell, the three-electrode cell comprising one reference electrode, one indicator electrode one auxiliary electrode, and a holder having three housing units, each housing unit being designed to accommodate one of said electrodes so as to hold the electrodes in fixed positions in relation to one another and to define an axis of orientation for said electrodes;a potentiostat provided to maintain a constant potential difference between the indicator electrode and the reference electrode;a peak detector provided to identify a maximum current flowing in said three electrode cell that corresponds to the developing agent concentration; anda display unit provided to show said maximum current;wherein said auxiliary electrode has an angled end and a non-angled part with respect to said axis of orientation, said non-angled part of the auxiliary electrode being located outside the holder and being electrically insulated so as to create parallel and uniform current lines between said indicator electrode and said auxiliary electrode.