Sensor arrangement with a plurality of potentiometric sensors

Details Sensor arrangement with a plurality of potentiometric sensors Sensor arrangement with a plurality of potentiometric sensors

2004-10-28

2008-07-01

Nguyen, Vincent Q (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S071100, C324S450000, C324S438000, C204S433000, C435S004000

Reexamination Certificate

active

07394263

ABSTRACT:
The sensor arrangement includes: a least two sample chambers; at least two potentiometric FET-sensors, especially ISFET-sensors or ChemFET-sensors, having, in each case, a sensitive surface section, wherein each sensitive surface section lies in flow connection with its one of the sample chambers; and a reference cell having a reference medium for providing a reference potential, wherein the sample chambers are connected with the reference medium via an electrolyte bridge. The reference cell has, preferably, a potentiometric reference-FET-sensor for providing a reference potential, which is registered against the pseudo-reference-potential of a redox electrode. The potentials Udiff1, Udiff2, . . . UdiffNof N FET-sensors in the sample chambers are determined against the pseudo-reference-potential, and the measured-variable-relevant, potential differences are determined, in each case, by difference formation between the pertinent potential and the reference potential—thus, in the case of pH, according to the formulasin-line-formulae description="In-line Formulae" end="lead"?UpH1. . . N=Udiff1. . . N−Udiffref.in-line-formulae description="In-line Formulae" end="tail"?

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