Measuring device with a plunge-in electrode

• US 7,755,345 B2
• Filed: 01/30/2001
• Issued: 07/13/2010
• Est. Priority Date: 02/02/2000
• Status: Expired due to Fees

• Current Assignee: Testo AG
• Original Assignee: Testo AG
• Inventors: Derr, Andreas
• Primary Examiner(s): NATALINI, JEFF WILLIAM
• Application Number:
  US10/182,857
• Publication Number:
  US 20030057952A1
• Time in Patent Office: 3,451 Days
• Field of Search: 324/438, 324/754, 324/757, 324/690
• US Class Current: 324/72.5
• CPC Class Codes: G01N 27/283 Means for supporting or introducing electrochemical probes
• CPC Class Codes: G01N 33/12 Meat; Fish

Abstract

Described is a measuring device, in particular for measuring the pH value in foodstuffs. The measuring device comprises an extended first electrode for plunging into a material to be measured and a sheath which at least partially surrounds the first electrode. The first electrode is pivotably mounted in order to prevent breakage as a result of transversal loads exerted perpendicularly to the axial direction of the electrode.

Claims

1. A measuring device, comprising:

a first electrode for insertion into a material to be measured;

a sheath which at least partially surrounds the first electrode, and

a holding fixture in which an axial end of said first electrode is disposed, wherein the holding fixture includes a recess which accommodates the axial end of the first electrode and includes an articulated support, coupled to the recess, which pivotably mounts the first electrode, wherein the articulated support of the holding fixture enables pivoting motion of the first electrode about an imaginary hinge point, the pivoting motion of the first electrode being independent of a flexing of the first electrode, the first electrode pivoting about the imaginary hinge point in response to the material to be measured applying a transverse load to the first electrode, and wherein said sheath has an increased diameter in a region of said articulated support.

2. The measuring device as recited in claim 1, wherein the sheath is made of a flexible material.

3. The measuring device of claim 2, wherein said flexible material is a flexible plastic.

4. The measuring device as recited in claim 1, wherein a chamber is formed between the first electrode and the sheath in which a second electrode for the measuring device is mounted.

5. The measuring device of claim 4, wherein said first and second electrodes have an electrical connection to a processing device.

6. The measuring device of claim 5, wherein said holding fixture is provided in a region at an end of said first electrode facing away from another end of said first electrode which is inserted into the material to be measured.

7. The measuring device of claim 6, wherein the recess has a base with an opening for passage of connection leads.

8. The measuring device of claim 7, wherein a diameter of said opening is smaller than a diameter of said first electrode.

9. The measuring device as recited in claim 1, wherein at least one of the first electrode and the sheath for the first electrode is made of glass.

10. The measuring device as recited in claim 1, wherein the holding fixture has an accommodating recess which forms a support for the axial end of the first electrode.

11. The measuring device as recited in claim 10, wherein lateral support is provided by arranging, between the first electrode and a side face of the recess, a ring-shaped element which surrounds the first electrode.

12. The measuring device as recited in claim 11, wherein the ring-shaped element has a sleeve-like design, and at least partially surrounds the first electrode at one end section introduced into the recess.

13. The measuring device as recited in claim 12, wherein the ring-shaped element is made of a flexible material.

14. The measuring device of claim 13, wherein the ring-shaped element is made of an elastomer.

15. The measuring device as recited in claim 10, wherein the ring-shaped element has an essentially circular cross-section.

16. The measuring device as recited in claim 15, wherein the ring-shaped element is situated in the region of the opening in the recess.

17. The measuring device of claim 16, wherein said first electrode has a limited pivoting range determined at least substantially by a design of said sheath.

18. The measuring device as recited in claim 10, wherein the recess has a truncated cone-shaped design and forms a support for the axial end of the first electrode at an end of the recess having a smallest diameter.

19. The measuring device of claim 18, wherein said diameter of said first electrode is greater than said smallest diameter.

20. The measuring device as recited in claim 1, wherein the sheath closely surrounds the first electrode at least one point.

21. The measuring device as recited in claim 1, wherein the sheath is closely surrounds the first electrode in at least one location on the sheath.

22. The measuring device as recited in claim 1, wherein the sheath is detachably placed on the first electrode.

23. The measuring device as recited in claim 1, wherein the holding fixture has a joint.

24. The use of a measuring device as recited in claim 1 for measuring the pH in foodstuffs.

25. The measuring device of claim 1, wherein said first electrode is essentially cylindrical.

26. The measuring device of claim 1, further comprising:

an insertion tip on a front end of said first electrode.

27. The measuring device of claim 1, wherein said holding fixture includes a shank containing a receptacle in which said first electrode is secured.

28. The measuring device of claim 1, further comprising:

a gasket disposed between said first electrode and said sheath, said gasket contacting said first electrode to allow said first electrode to be displaced relative to said gasket to compensate for a length of said sheath when said first electrode is pivoted.

29. The measuring device of claim 1, wherein elasticity of said sheath is in accordance with a transverse load bearing capacity of said first electrode.

30. A measuring device, comprising:

a first electrode for inserting into a material to be measured;

a sheath which at least partially surrounds the first electrode; and

a pivot assembly including a recess which accommodates an axial end of the first electrode and including an articulated support, coupled to the recess, that pivotably mounts said first electrode within said sheath, wherein the articulated support of the pivot assembly enables pivoting motion of the first electrode about an imaginary hinge point, the pivoting motion of the first electrode being independent of a flexing of the first electrode, wherein the sheath is formed from a flexible material, wherein the first electrode pivots about the imaginary hinge point in response to the material to be measured applying a transverse load to the first electrode, and wherein said sheath has an increased diameter in a region of said articulated support.

31. A measuring device comprising:

means for inserting a first electrode into a material to be measured; and

means for pivotably mounting said means for inserting, wherein the means for pivotably mounting includes a recess which accommodates an axial end of the first electrode and includes an articulated support, coupled to the recess, that pivotably mounts the first electrode, wherein the articulated support enables pivoting motion of the first electrode about an imaginary hinge point, the pivoting motion of the first electrode being independent of a flexing of the first electrode, the first electrode pivoting about the imaginary hinge point in response to the material to be measured applying a transverse load to the first electrode, and wherein said means for inserting has an increased diameter in a region of said articulated support.

32. The measuring device of claim 31, further comprising:

means for electrically connecting said first electrode to a processing device for determining and displaying a measured value.

33. The measuring device of claim 31, wherein said means for pivotably mounting further comprising:

means for holding said means for inserting such that said means for inserting resists transverse loads resulting from tilting of the measuring device during at least one of insertion and withdrawal into the material to be measured such that said means for inserting pivots under transverse loads.

34. The measuring device of claim 33, wherein said means for holding further comprising:

means for accommodating an end of said means for inserting to support the means for inserting against exerted axial forces.

35. The measuring device of claim 34, further comprising:

means for supporting said means for inserting allowing a portion of said means for inserting below a predetermined position to move sideways under a transverse load such that said means for inserting pivots about an imaginary hinge point.

36. The measuring device of claim 35, wherein said means for supporting includes a ring-shaped element for supporting said means for inserting.

37. The measuring device of claim 36, wherein said ring-shaped element has a sleeve-like design.

38. The measuring device of claim 36, wherein said ring-shaped element forms an O-ring.

39. The measuring device of claim 31, wherein said means for pivotably mounting includes a sheath at least partially surrounding said means for inserting, and the measuring device further comprising:

means for compensating for a length of the sheath when the means for inserting is pivoted.

40. A measuring device, comprising:

a first electrode for insertion into a material to be measured;

a sheath which at least partially surrounds the first electrode,

a holding fixture including a recess in which an axial end of said first electrode is disposed; and

a pivot element in contact with said holding fixture, wherein the pivot element includes an articulated support, wherein the articulated support of the pivot element is coupled to the recess and enables pivoting motion of the first electrode about an imaginary hinge point, the pivoting motion of the first electrode being independent of a flexing of the first electrode, the first electrode being pivotably mounted using said articulated support of the pivot element, wherein the first electrode pivots about the imaginary hinge point in response to the material to be measured applying a transverse load to the first electrode, and wherein said sheath has an increased diameter in a region of said articulated support.