In-line measuring device with measuring tube lined internally with polyurethane and method for manufacture thereof
AssigneeEndress + Hauser Flowtec AG
InventorsThomas Sulzer, Johannes Ruchel, Alexander Stuenzi
Life of this patent
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Abstract
The measuring tube of the in-line measuring device is formed by means of a support tube and a liner internally lining the support tube. The liner adheres to the support tube, with interposition of a mediating primer. Both the primer and the liner are composed, at least in part, of polyurethane. Especially, both the polyurethane of the liner and also the polyurethane of the primer are suitable for drinking water applications, so that the in-line measuring device itself is also suited for measuring drinking water.
Claims21
A method for manufacturing a measuring tube of an in-line measuring device, wherein the measuring tube includes a support tube and a liner internally lining the support tube, which method comprises steps of:
- forming a flowable, especially sprayable and/or brushable, first multicomponent system, which contains isocyanate as well as a di-, or more-, valent alcohol;
- applying the first multicomponent system onto an inner wall of a support tube, especially a metal support tube, serving as a component of the measuring tube;
- allowing at least parts of the first multicomponent system to cure on the inner wall of the support tube for forming a primer adhering to the support tube;
- forming a flowable, second multicomponent system, which contains isocyanate, a di-, or more-, valent alcohol, and a catalyst;
- applying the second multicomponent system onto the primer formed on the inner wall of the support tube;
- and
- allowing the second multicomponent system to cure in the support tube for forming the liner.
Dependencies are inferred from the claim text.