A process for manufacturing an electrochemical sensor, wherein the process is a reel-to-reel process which comprises - moving a metal wire from a wire feed unit to a wire pick-up unit , wherein the wire feed unit comprises a roll which unwinds the wire while the wire pick-up unit comprises a roll which rewinds the wire , the moving wire passing at least one printer P cond which is located in between the wire feed and wire pick-up units , wherein the metal wire which reaches the printer P cond contains one or more areas on which no electrically insulating polymer coating is present, or the metal wire which reaches the printer P cond is completely coated with the electrically insulating polymer coating and an ablation treatment is carried out in an ablation unit being located downstream the conductive ink printer P cond so as to expose the metal wire in one or more defined areas, - printing an ink which comprises electrically conductive particles by the printer P cond onto discrete arrays of the electrically insulating polymer coating which is present on the metal wire , such that discrete arrays of electrically conductive material are obtained, - subjecting the ink which has been printed on the discrete arrays to a thermal treatment, thereby obtaining discrete electrically conductive solid coatings which comprise the electrically conductive particles, wherein the metal wire and the discrete electrically conductive solid coatings act as electrodes, - cutting the wire in a wire cutting unit into individual pieces, each piece comprising at least two electrodes, wherein the wire cutting unit is downstream of the wire pick-up unit and no wire cutting takes place in between the wire feed and pick-up units . - moving a metal wire from a wire feed unit to a wire pick-up unit , wherein the wire feed unit comprises a roll which unwinds the wire while the wire pick-up unit comprises a roll which rewinds the wire , the moving wire passing at least one printer P cond which is located in between the wire feed and wire pick-up units , wherein the metal wire which reaches the printer P cond contains one or more areas on which no electrically insulating polymer coating is present, or the metal wire which reaches the printer P cond is completely coated with the electrically insulating polymer coating and an ablation treatment is carried out in an ablation unit being located downstream the conductive ink printer P cond so as to expose the metal wire in one or more defined areas, - printing an ink which comprises electrically conductive particles by the printer P cond onto discrete arrays of the electrically insulating polymer coating which is present on the metal wire , such that discrete arrays of electrically conductive material are obtained, - subjecting the ink which has been printed on the discrete arrays to a thermal treatment, thereby obtaining discrete electrically conductive solid coatings which comprise the electrically conductive particles, wherein the metal wire and the discrete electrically conductive solid coatings act as electrodes, - cutting the wire in a wire cutting unit into individual pieces, each piece comprising at least two electrodes, wherein the wire cutting unit is downstream of the wire pick-up unit and no wire cutting takes place in between the wire feed and pick-up units . <EOS>