Electrode head

A measurement electrode head system for connection to electrochemical potential measurement glass and plastic electrode rods, comprising:

• one piece electrode cap means for connection with the electrode rods;
• at least one contact in said cap means for connection with an output connection socket from the electrode rod;
• a coaxial cable having an insulated outer shielding conductor surrounding at least one insulated inner conductor;
• said electrode cap means including a plastic jacket integrally moulded onto one end of the coaxial cable, said jacket and a continuous electrically conductive shielding layer adjacent an inside surface thereof dimensioned to tightly surround and contact a periphery of the glass or plastic end of the electrode rod, said layer being connected directly to the outer conductor of the cable;
• at least one inner conductor of the coaxial cable directly connecting to a connection pin supported within and surrounded by the electrode cap means and conductive shielding layer;
• and the connection pin being dimensioned for insertion into the electrode rod output connection socket for solderless contact therewith.

A method for producing a measurement electrode head system for connection to an electrochemical potential measurement glass or plastic electrode rod, said electrode head including a one-piece electrode cap receivable directly on one end of the electrode rod, said cap also connecting to a coaxial cable having an outer shielding conductor and an inner conductor, comprising the steps of:

• providing a continuous cylindrical metal conductive layer having dimensions adapted to permit a tight fit over the glass or plastic end of the electrode rod;
• connecting the metal conductive layer at an end of the cable directly to the outer conductor of the cable;
• connecting the inner conductor of the cable to a connection socket adapted for solderless contact of a pin or wire of the electrode rod to be inserted therein;
• supporting the connection socket within the cylindrical metal conductive layer by a spacer element received in a smaller diameter cylindrical portion of the layer;
• placing the resulting assembly in a mould and overmoulding the assembly with a plastic jacket which extends over a portion of an end of the cable and over a substantial portion of the outer shielding conductor so as to hermetically seal the electrode head;
• and placing the completed one-piece cap over the end of the rod such that the cylindrical metal conductive layer is in a direct hermetic contact with a peripheral wall of the rod.

A method for producing a measurement electrode head system for connection to an electrochemical potential measurement glass or plastic electrode rod, said electrode head including a one-piece electrode cap receivable directly on one end of the electrode rod, said cap also connecting to a coaxial cable having an outer shielding conductor and an inner conductor, comprising the steps of:

• providing a continuous cylindrical metal conductive layer having dimensions adapted to permit a tight fit over the glass or plastic end of the electrode rod;
• connecting the metal conductive layer at an end of the cable directly to the outer conductor of the cable;
• connecting the inner conductor of the cable to a connection pin adapted for solderless contact of a socket of the electrode rod which receives the pin;
• supporting the connection pin within the cylindrical metal conductive layer by a spacer element received in a smaller diameter cylindrical portion of the layer;
• placing the resulting assembly in a mould and overmoulding the assembly with a plastic jacket which extends over a portion of an end of the cable and over a substantial portion of the outer shielding conductor so as to hermetically seal the electrode head;
• and placing the completed one-piece cap over the end of the rod such that the cylindrical metal conductive layer is in a direct hermetic contact with a peripheral wall of the rod.