# US 2014/0151223 A1 · Sensor for Registering an Analyte Concentration

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- Number: US 2014/0151223 A1
- Document ID: US20140151223A1
- Status: Published application
- Kind: A1
- Application number: 14/095,330
- Filed: 2013-12-03
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG
- Applicants: Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co., KG
- Inventors: Lothar Auerswald; Jorg Uhle; Tobias Mieth
- Web page: https://patentgrep.com/patent/US20140151223A1

## CPC

- G01N 27/28: Electrolytic cell components
- G01N 27/286: {Power or signal connectors associated therewith}
- G01N 27/414: Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A sensor for registering analyte concentration includes: a housing; arranged within the housing, a sensor element, which has a front surface pressed toward a housing wall of the housing, and the sensor element has at least one contact element for electrical contacting accommodated within the housing, an inner electrolyte, which is in contact with a medium surrounding the housing via an electrochemical, liquid junction arranged in a housing wall, and a reference electrode extending into the inner electrolyte, wherein there is arranged within the housing a flexible circuit card, which includes at least a first conductive trace, which is connected with the at least one contact element of the sensor element, and at least a second conductive trace, which serves as potential sensing element of the reference electrode.

## Claims

### Claim at position 1

1-15. (canceled)

### Claim 16

A sensor for registering an analyte concentration, comprising:
a housing;
a sensor element arranged within said housing, said sensor element has a front surface pressed toward a housing wall of said housing, wherein said housing wall has an opening exposing an analyte sensitive region of said front surface;
at least one contact element for electrical contacting said sensor element;
an inner electrolyte which is in contact with a medium surrounding said housing via an electrochemical, liquid junction arranged in a housing wall; and
a reference electrode extending into said inner electrolyte, wherein:
there is arranged within said housing a flexible circuit card, which includes at least a first conductive trace, which is connected with said at least one contact element of said sensor element, and at least a second conductive trace, which serves as a potential sensing element of said reference electrode.

### Claim 17 (depends on 16)

The sensor as claimed in claim 16, wherein:
said inner electrolyte is contained in a first chamber formed within said housing;
said housing has, sealed from said first chamber, a second chamber, in which a sensor circuit, especially an electronic, sensor circuit, is accommodated; and
said first chamber is sealed from said second chamber, especially by means of at least one seal, through which said flexible circuit card is led.

### Claim 18 (depends on 17)

The sensor as claimed in claim 17, wherein:
said first and said second conductive traces are connected electrically conductively with said sensor circuit.

### Claim 19 (depends on 17)

The sensor as claimed in claim 17, wherein:
said sensor circuit is arranged within said second chamber on a circuit card, which is coupled with said flexible circuit card in such a manner that said first and said second conductive traces are connected electrically conductively with said sensor circuit.

### Claim 20 (depends on 17)

The sensor as claimed in claim 17, wherein:
said housing comprises a sensor body and an electronics housing part fixedly connected with said sensor body;
said sensor body has an at least sectionally tubular, sensor shaft and, adjoining said sensor shaft frontally, an end section, which includes the housing wall, toward which the front surface of said sensor element is pressed; and
a rear end of said sensor shaft is closed by said electronics housing part.

### Claim 21 (depends on 20)

The sensor as claimed in claim 20, wherein:
there is arranged in a rear end region of said sensor shaft for sealing said first chamber relative to said second chamber a seal, which comprises, biased toward one another, at least two sealing elements of synthetic material, between which said flexible circuit card is clamped.

### Claim 22 (depends on 20)

The sensor as claimed in claim 20, wherein:
said electronics housing part includes an interface for connecting to a superordinated unit.

### Claim 23 (depends on 16)

The sensor as claimed in claim 16, wherein:
said reference electrode has an at least sectionally chlorided silver wire connected with said second conductive trace.

### Claim 24 (depends on 16)

The sensor as claimed in claim 16, wherein:
said reference electrode comprises a silver layer arranged on said flexible circuit card and in electrical contact with said second conductive trace.

### Claim 25 (depends on 16)

The sensor as claimed in claim 16, wherein:
the electrically conductive connection between said reference electrode and said flexible circuit card is arranged in a frontal region of said flexible circuit card, preferably in the vicinity of said sensor element.

### Claim 26 (depends on 16)

The sensor as claimed in claim 16, wherein:
said flexible circuit card includes an additional, shielding ply.

### Claim 27 (depends on 16)

The sensor as claimed in claim 16, wherein:
said flexible circuit card is equipped in the region of said sensor element with a temperature sensor, which is connected with a third conductive trace of said flexible circuit card.

### Claim 28 (depends on 27)

The sensor as claimed in claim 27, wherein:
said third conductive trace is connected with said sensor circuit.

### Claim 29 (depends on 16)

The sensor as claimed in claim 16, wherein:
said sensor element comprises an EIS structure.

### Claim 30 (depends on 16)

The sensor as claimed in claim 16, wherein:
said sensor element comprises an ion sensitive field effect transistor (ISFET), which has, besides the analyte sensitive region serving as gate on the front surface, a source connection arranged on the front surface or on a rear surface of said sensor element lying opposite the front surface and serving as contact element and a drain connection arranged on the front surface or on the rear surface of said sensor element and serving as a further contact element.