Patent ID: 8449824

Claim:
A sensor instrument system, comprising: a. a central station remote to a sensor instrument, said instrument includes a first sensor electrically connected to a detection module, a transmission module and a global positioning system (GPS) receiver module; b. said first sensor includes first and second electrodes that are electrically separated by a first nonconductive material, wherein said first sensor is brought into contact with a portion of a sample of a fluid containing an analyte to thereby provide a detectable information for said analyte in said fluid; c. said detection module is configured to generate a multiplicity of frequencies of alternating current (AC) signals of a group which have a same magnitude and are applied to said first sensor, and thereby measure said detectable information based on said group of said applied frequencies, wherein said detectable information comprises two AC related electrical properties at each of said applied frequencies of said AC signals for said analyte in said fluid; d. said GPS receiver module locates a geographic position of said analyte which is detected; e. said transmission module is in electrical communication with said detection and GPS receiver modules for transmitting data of said detectable information and said located geographic position to said central station; and f. said central station including means for storing said data and means for analyzing said detectable information in accordance with frequencies in a selected subgroup of said applied frequencies of said AC signals to thereby identify said analyte.