Electrochemical sensor

Details Electrochemical sensor Electrochemical sensor

2007-07-10

2007-07-10

Noguerola, Alex (Department: 1753)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C257S253000

Reexamination Certificate

active

10655038

ABSTRACT:
An electrochemical sensor has a sensor housing and an ion-sensitive field effect transistor (ISFET) with a source connection (S) and a drain connection (D). An ion-sensitive surface area (IS) on the front surface of the ISFET is immersible in a measuring medium. A clamping element serves to clamp the ISFET with its rear surface against an end surface of the sensor housing. The clamping element has a central opening leaving the ion-sensitive surface area (IS) exposed. A leak-tight circular connection between the clamping element and the sensor housing is formed by vibratory, preferably ultrasonic, welding. The ISFET is sandwiched between two rubber-elastic elements, at least one of which forms a leak-tight seal against penetration of the measuring medium from the ion-sensitive surface area (IS) to the source- and drain connections (S) and (D).

REFERENCES:
patent: 4505799 (1985-03-01), Baxter
patent: 6117292 (2000-09-01), Ahmad
patent: 6153070 (2000-11-01), Maurer et al.
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patent: 1003458 (1998-01-01), None
Derwent abstract of NL 1003458 C2, issued Jan. 7, 1998.

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