Electrochemical sensor

1. An electrochemical sensor, comprising

a sensor housing;

an ion-sensitive field effect transistor (ISFET) with a source connection (S), a drain connection (D), a front surface having an ion-sensitive surface area (IS) that is immersible in a measuring medium, and a rear surface facing away from the ion-sensitive surface area;

a clamping element to clamp the ISFET with the rear surface against an end surface of the sensor housing, said clamping element having a central opening leaving the ion-sensitive surface area (IS) exposed; and

a first rubber-elastic element placed against said front surface and a second rubber-elastic element placed against the rear surface, so that the ISFET is sandwiched between the first and second rubber-elastic elements;

wherein the source connection (S) and the drain connection (D) are arranged in an interior space of the electrochemical sensor; wherein the clamping element has a leak-tight circular connection to the sensor housing formed by vibratory welding; and wherein at least one of said first and second rubber-elastic elements forms a leak-tight seal against penetration of the measuring medium from the ion-sensitive surface area (IS) to said source- and drain connections (S) and (D).

2. The electrochemical sensor of claim 1 , wherein the source connection (S) and the drain connection (D) are arranged on said front surface.

3. The electrochemical sensor of claim 2 , wherein at least one of the first and second rubber-elastic elements is configured as a ring seal.

4. The electrochemical sensor of claim 3 , wherein the sensor housing has a channel ending in a frontal opening of the end surface, and wherein the entire frontal opening and the measuring medium are located, respectively, on opposite sides of the leak-tight circular connection.

5. The electrochemical sensor of claim 4 , wherein the channel is filled with a potting compound which extends up to the rear surface and forms a mechanical support for the ISFET.

6. The electrochemical sensor of claim 4 , wherein the sensor housing is of a substantially tubular shape.

7. The electrochemical sensor of claim 4 , wherein the ion-sensitive surface area (IS) is oriented at an oblique angle relative to a longitudinal axis (L) of the sensor housing.

8. The electrochemical sensor of claim 1 , wherein at least one of the first and second rubber-elastic elements is configured as a ring seal.

9. The electrochemical sensor of claim 1 , wherein the sensor housing has a channel ending in a frontal opening of the end surface, and wherein the entire frontal opening and the measuring medium are located, respectively, on opposite sides of the leak-tight circular connection.

10. The electrochemical sensor of claim 9 , wherein the channel is filled with a potting compound which extends up to the rear surface and forms a mechanical support for the ISFET.

11. The electrochemical sensor of claim 1 , wherein the sensor housing is of a substantially tubular shape.

12. The electrochemical sensor of claim 11 , wherein the ion-sensitive surface area (IS) is oriented at an oblique angle relative to a longitudinal axis (L) of the sensor housing.

13. The electrochemical sensor of claim 1 , comprising:

a temperature sensor for measuring a temperature of the ISFET.

14. The electrochemical sensor of claim 1 , wherein the ISFET is configured as a pH-sensitive element.

15. The electrochemical sensor of claim 1 , comprising:

a reference electrode.