Mettler-toledo Gmbh

Ingo Andreas Schneider

Corrado Barcella

Petr Horn

Dario Meier

Fritz Baltensperger

ISFET measuring probe with a housing in which an ISFET and a reference electrode are arranged in such a way that the gate electrode of the ISFET, which is coated with an ion-sensitive layer, and the reference electrode reach into a measurement space into which a measurement medium can be introduced, with the distinguishing feature that an auxiliary electrode is arranged additionally inside the housing and is held inside the measurement space.

ISFET measuring probe, measurement circuit for the ISFET measuring probe, and method

An electrochemical sensor, used with a measuring medium, has a sensor head (), a sensor chip () with a sensitive region (), a sensor body () with an end piece (), a sealing means () and a pressing element (). The sensor body is connected to the sensor head. The end piece is hollow with a closed end region and a measuring opening () that allows the measuring medium to contact the sensitive region, which is inside the end piece during operation. The sealing means surrounds the measuring opening, other than the sensitive region, and seals the inside of the end piece from the measuring medium during operation. The pressing element biases the sensor chip against the sealing means and the edge of the measuring opening. The end piece has an integral, gap-free design in the region that contacts the measuring medium during operation.

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Cham, Switzerland

Ingo Andreas Schneider