Temperature sensor having a frame made of a mineral material

1. A measuring sensor for measuring temperature in a chemical process, the measuring sensor comprising:

a measuring element supported on an inner surface of a frame, the frame being configured to be in contact with a process liquid to be measured and the measuring element being configured to be in thermal contact with the process liquid being measured; and

measuring conductors connected to the measuring element for directing a measuring signal forward, wherein the frame of the measuring sensor is made of mineral material and arranged to form an optical window which is configured to be in contact with the process liquid to be measured.

2. A measuring sensor as claimed in claim 1 , wherein the mineral material is a monocrystalline mineral material.

3. A measuring sensor as claimed in claim 2 , wherein the mineral material is sapphire.

4. A measuring sensor as claimed in claim 1 , wherein the mineral material is sapphire.

5. A measuring sensor as claimed in claim 1 , comprising:

a heat-conductive circuit board configured to be fastened to the measuring element.

6. A measuring sensor as claimed in claim 5 , wherein the frame includes a cylindrical portion, and the measuring element and the heat-conductive circuit board are located within the cylindrical portion of the frame.

7. A measuring sensor as claimed in claim 6 , wherein the measuring conductors are connected to the measuring element by terminal areas arranged close to and not in physical contact with the measuring element, and wherein the terminal areas are arranged in unrestricted thermal contact with the process liquid being measured and located within the cylindrical portion of the frame.

8. A measuring sensor as claimed in claim 1 , wherein the measuring element is a Pt 1000 resistor element.

9. A measuring sensor as claimed in claim 1 , in combination with a process pipe.

10. A measuring sensor as claimed in claim 1 , wherein the measuring element is supported on a portion of the frame, which is essentially planar.

11. A measuring sensor as claimed in claim 1 , wherein the frame is formed into an essentially planar element that is attached by means of a packing to an opening in the process pipe.

12. A measuring sensor as claimed in claim 1 , wherein the measuring conductors are connected to the measuring element by terminal areas arranged close to and not in physical contact with the measuring element, and wherein the terminal areas are arranged in unrestricted thermal contact with the process liquid being measured.

13. A measuring sensor as claimed in claim 12 , wherein the terminal areas are formed by electrically conductive metallization.

14. A measuring sensor for measuring temperature in a chemical process, the measuring sensor comprising:

a measuring element supported on an inner surface of a frame, the frame being configured to be in contact with a process liquid to be measured and the measuring element being configured to be in thermal contact with the process liquid being measured; and

measuring conductors connected to the measuring element for directing a measuring signal forward, wherein the frame of the measuring sensor is made of mineral material.

15. A measuring sensor as claimed in claim 14 , wherein the mineral material is a monocrystalline mineral material.

16. A measuring sensor as claimed in claim 14 , wherein the mineral material is sapphire.

17. A measuring sensor as claimed in claim 14 , comprising:

a heat-conductive circuit board configured to be fastened to the measuring element; and

wherein the frame includes a cylindrical portion, and the measuring element and the heat-conductive circuit board are located within the cylindrical portion of the frame.

18. A measuring sensor as claimed in claim 14 , wherein the measuring element is a Pt 1000 resistor element.

19. A measuring sensor as claimed in claim 14 , in combination with a process pipe.

20. A measuring sensor as claimed in claim 14 , wherein the measuring element is supported on a portion of the frame, which is essentially planar.

21. A measuring sensor as claimed in claim 14 , wherein the frame is formed into an essentially planar element that is attached by means of a packing to an opening in the process pipe.

22. A measuring sensor as claimed in claim 14 , wherein the measuring conductors are connected to the measuring element by terminal areas arranged close to and not in physical contact with the measuring element, and wherein the terminal areas are arranged in unrestricted thermal contact with the process liquid being measured.