Potentiometric sensor with status monitoring

Details Potentiometric sensor with status monitoring Potentiometric sensor with status monitoring

2006-12-22

2009-11-10

Bell, Bruce F (Department: 1795)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S406000, C204S433000

Reexamination Certificate

active

07615140

ABSTRACT:
A potentiometric sensor for measuring a potentiometric variable of a medium comprises an ISFET whose gate region exhibits an ion-sensitive surface which can be exposed to the medium and which outputs an output signal that depends on the concentration of the ions at the ion-sensitive surface of the gate region. An evaluation circuit with a measuring input to which the output signal of the ISFET is applied is included, whereby the evaluation circuit is designed to output a measured value for the potentiometric variable, depending on the output signal. Also included is a measuring resistor which is arranged between the output of the ISFET and the input of the evaluation circuit, a monitoring circuit to determine the voltage drop over the measuring resistor, and a bridge section that is parallel to the measuring resistor to bridge the measuring resistor whereby the bridge section exhibits a switch with which the bridge section can be opened or closed.

REFERENCES:
patent: 4444644 (1984-04-01), Hiramoto et al.
patent: 5583462 (1996-12-01), Grasshoff
patent: 6624637 (2003-09-01), Pechstein
patent: 2004/0223287 (2004-11-01), Chung et al.
patent: 2005/0230245 (2005-10-01), Morgenshtein et al.
patent: 2006/0046375 (2006-03-01), Chou et al.
patent: 2007/0089988 (2007-04-01), Chung et al.

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