초록 ▼

An insert for a measuring tube of an inductive flowmeter is disclosed, having a middle section and two end sections, in which at least one end section is of resilient construction and the middle section is of rigid construction. A flange constituting an earthing electrode is provided in a section B2

An insert for a measuring tube of an inductive flowmeter is disclosed, having a middle section and two end sections, in which at least one end section is of resilient construction and the middle section is of rigid construction. A flange constituting an earthing electrode is provided in a section B2B comprising electrically conductive elastomer. Integrally-formed electrodes 12 and 13 are also formed by electrically conductive elastomer.

대표청구항 ▼

1. A tubular insert for an inductive flowmeter comprising:a middle section and two end sections, in which at least one end section is resilient and wherein the middle section is rigid, the middle section being made form a first material and the at least one end section being made from a second mater

1. A tubular insert for an inductive flowmeter comprising:a middle section and two end sections, in which at least one end section is resilient and wherein the middle section is rigid, the middle section being made form a first material and the at least one end section being made from a second material, and wherein the second material has a lower modulus of elasticity than the first material. 2. An insert according to claim 1, the insert comprising a first section comprising material of a first composition, and a second section comprising material of a second, different composition, the material of the second composition being electrically conductive.3. An insert according to claim 2, wherein the first section and the second section are, in use, in contact with the fluid passing through the flowmeter.4. An insert according to claim 2, wherein the insert, including the first and second sections, is integrally formed.5. An insert according to claim 2, wherein said first composition is electrically insulating.6. An insert according to claim 2, wherein said second section comprises an end section of the insert.7. An insert according to claim 2, wherein said second section comprises an end flange of the insert.8. An insert according to claim 6, wherein said insert has an electrically conducting end section at one end only.9. An insert according to claim 2, wherein the material of the second composition comprises an electrically conductive elastomer.10. An insert according to claim 2, wherein the material of the first composition comprises an electrically insulating elastomer.11. An insert according to claim 1, wherein between the middle section and the at least one end section there is a transition zone in which the two materials merge into one another.12. An insert according to claim 11, wherein the transition zone has a resilience increasing with distance from the middle section.13. An insert according to claim 1, wherein the two materials are cross-linkable with one another.14. An insert according to claim 1, wherein the two materials are thermosetting materials.15. An insert according to claim 1, wherein both end sections are formed from the second material.16. An insert according to claim 1, wherein the first material is constituted by hard rubber.17. An insert according to claim 1, wherein the second material is constituted by soft rubber.18. An insert according to claim 17, wherein the soft rubber is nitrile.19. An insert according to claim 18, wherein the soft rubber is selected from a material group containing chloroprene and butyl.20. An insert according to claim 1, wherein the at least one end section has a fixing flange.21. An insert according to claim 1, wherein a metering section is arranged in the middle section, which middle section has a smaller inner diameter than the inner diameter at the outer end of the at least one end section.22. An insert according to claim 1, wherein projections are provided on the circumferential surface of the insert.23. An insert according to claim 22, wherein at least one projection includes a cable guide groove.24. A tubular insert for an inductive flowmeter, the insert comprising an integrally-formed body of material of a first, electrically insulating, composition, the body including at least one region of a second, electrically conducting, composition to serve as an earthing or sensing electrode for the flowmeter.25. An insert according to claim 24, wherein said at least one region comprises an end section of the insert to serve as an earthing electrode for the flowmeter.26. An insert according to claim 24, wherein said at least one region comprises a region between the ends of the insert to serve as a sensing electrode for the flowmeter.