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Sensor system

A sensor, sensitive technology, applied in the field of sensor systems

Inactive Publication Date: 2009-05-20
ENDRESS HAUSER CONDUCTA GESELLSCHAFT FUER MESS UND REGELTECHNIK MBH CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The described sensor system is only intended to detect a single sample

Method used

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Embodiment Construction

[0025] FIG. 1 schematically shows the functional principle of the sensor system of the invention. The FET sensors 10 of the sensor system each have a sensitive gate area that can come into contact with the electrolyte in the sample chamber. The individual sample chambers of the sensor system are connected to each other via electrolyte bridges. For this purpose, the electrolyte bridge comprises an electrolyte channel 11 which communicates with the sample chamber via the membrane. The sensor system also comprises a reference cavity in which a reference electrode 13 and a reference FET 12 are located, wherein the reference electrode is made of platinum, for example. The reference FET outputs a pseudo-reference potential U diffref , relative to which it measures the potential U of the N FET sensors in the sample chamber diff1 , U diff2 ...... U diffN . The potential difference associated with the measured variable, e.g. U pH1 , is determined by the difference between the as...

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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, . . . UdiffN of 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 formulas <?in-line-formulae description="In-line Formulae" end="lead"?>UpH1. . . N=Udiff1. . . N-Udiffref.<?in-line-formulae description="In-line Formulae" end="tail"?>

Description

technical field [0001] The invention relates to a sensor system for the potentiometric detection of multiple samples, in particular with so-called IsFET or ChemFET sensors. Background technique [0002] Potentiometric FET sensors of the described type are suitable for measuring the pH value or the redox potential of electrolytes. For example, patent DE 198 57 953 C2 discloses the realization of a pH-IsFET sensor in which, in order to reduce circuit complexity, the IsFET sensor is connected in a bridge circuit with at least three additional resistors. Considering the installation of the FET sensor, the following principles are known. Benton in US Patent No. 5,833,824 discloses a pH sensor in which an IsFET chip is affixed to the lower surface of a substrate with a metal seal surrounding the ion sensitive area of ​​the IsFET chip aligned with an opening in the substrate. Outside the area surrounded by the seal, conductive traces on the chip surface are led to contact surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/414
CPCG01N27/414
Inventor 沃夫冈·巴贝尔托尔斯滕·佩希施泰因托马斯·施特肯赖特
Owner ENDRESS HAUSER CONDUCTA GESELLSCHAFT FUER MESS UND REGELTECHNIK MBH CO KG