Patent ID: 8519726

Claim:
A sensor, comprising: a. an analytical sensor including first, second and third identical electrodes, which are positioned equally spaced apart in order, alignment and parallel with each other, wherein said first and third electrodes are electrically connected in parallel by a first electrically conducting means serving as a first electrical pole and said second electrode is connected by a second electrically conducting means serving as a second electrical pole, said first and second electrodes are electrically separated by a first non-conductive material and said second and third electrode are electrically separated by a second non-conductive material that is identical to said first non-conductive material; b. said analytical sensor is brought into contact with a first fluid containing an analyte; c. said first and second electrical poles of said analytical sensor are electrically connected to an alternating current (AC) analyzing device, wherein said AC analyzing device applies various frequencies of AC signals to said analytical sensor; d. AC related electrical properties are detected for said analytical sensor when contacted by said first fluid containing said analyte according to said applied various frequencies of said AC signals, wherein said electrical properties are detected at each of said applied various frequencies; and e. said detected AC related electrical properties according to a selected subgroup of said applied various frequencies are used for identification of said analyte.