Electrochemical sensor devices are provided, in various amperometric, potentiometric, and conductometric sensor device configurations. A potentiometric sensor device (1200) includes a structural body which comprises a plurality of reservoirs (1204) that each have at least one opening in the structural body at least one indicator electrode (1208) located within the plurality of reservoirs at least one reference electrode (1212) at least one reservoir cap (1206) closing the at least one opening of each of the plurality of reservoirs, to isolate the at least one indicator electrode within the plurality of reservoirs and to prevent an analyte ion outside of the reservoirs from contacting the at least one indicator electrode and means for rupturing or displacing the reservoir caps to permit the analyte ion from outside of the reservoir to contact the at least one indicator electrode, wherein an electrical potential which can be developed between the at least one indicator electrode and the at least one reference electrode provides a sensor signal indicative of a concentration of the analyte ion.
