Sensor arrangement provided with several potentiometric sensors

The Inventive sensor assembly comprises at least two sample chambers; at least two potentiometric FET sensors, particularly sensors ISFET or CHEMFET sensors, each with a sensitive surface section where the sensitive surface portion in each case with one of the sample chambers is in fluid communication; and a Reference cell with a reference medium for providing a reference potential, wherein said sample chambers are connected to the reference medium via an electrolyte bridge. The reference cell is preferably a potentiometric reference FET sensor for providing a reference potential to which against the is detected pseudo reference potential of a Potentialableitelektrode. The potentials Udiff1, Udiff2. ... UDIFFn of N FET sensors in the sample chambers be determined against the pseudo reference potential, and the measured variable relevant potential differences respectively by the difference between of each potential and the reference potential Uph1 ... N = Udiff1 ... N - Udiffref certainly.