Patent ID: 7632384

Claim:
A multi-functional electrochemical sensor system comprising: a saturated reference electrode; a sensing reference electrode; the saturated electrode having a first outer tube, the first outer tube having a central aperture running the length of the first outer tube, the central aperture of the first outer tube having an upper and lower end; the lower end of the central aperture of the first outer tube being plugged by a high density diffusion barrier; a first coaxial thermocouple having a thermosensing end, a data retrieval end, an outer conducting sheath, and an inner thermosensor; the first coaxial thermocouple positioned within the first outer tube so that the thermosensing end of the thermocouple extends into the lower end of the central aperture of the first outer tube above the high density diffusion barrier; a first inner metal oxide sensing phase and a second inner metal oxide sensing phase the first and second inner metal oxide sensing phases contained in, at least the lower end of the central aperture of the first outer tube above the high density diffusion barrier and coating at least a portion of the thermosensing end of the first thermocouple; a first voltage wire connecting the outer conducting sheath of the first coaxial thermocouple to the data acquisition system; a set of first data wires connecting the inner thermosensor of the first coaxial thermocouple to the data acquisition system; the sensing electrode having a second outer tube, the second outer tube having a central aperture running the length of the second outer tube, the central aperture of the second outer tube having an upper and lower end; the lower end of the central aperture of the second outer tube being plugged by a low density, highly porous diffusion barrier; a second coaxial thermocouple having a thermosensing end, a data retrieval end, an outer conducting sheath, and an inner thermosensor; the second coaxial thermocouple positioned within the second outer tube so that the thermosensing end of the thermocouple extends into the lower end of the central aperture of the second outer tube above the low density diffusion barrier; a third inner metal oxide sensing phase, the third inner metal oxide sensing phase coating at least a portion of the thermosensing end of the second thermocouple; a second voltage wire connecting the outer conducting sheath of the second coaxial thermocouple to the data acquisition system; a set of second data wires connecting the inner thermosensor of the second coaxial thermocouple to the data acquisition system.