Single Rod Measuring Chain With Hydrogel Diaphragm And Method For Producing The Single Rod Measuring Chain
Patent No. EP4137810 (titled "Single Rod Measuring Chain With Hydrogel Diaphragm And Method For Producing The Single Rod Measuring Chain") was filed by Hamilton Bonaduz on Dec 10, 2019. The application was issued on Jul 16, 2025.
Patent Summary
A combination electrode for measuring fluids comprises a working electrode, a reference electrode, a diaphragm, and a first electrically conductive fluid. The first conductive fluid contacts both the reference electrode and the diaphragm, electrically connecting them. The diaphragm consists of a hydrogel made from a thermoplastic elastomer. This non-porous hydrogel structure prevents the mixing of the conductive fluid (e.g., KCl solution) and the measuring fluid, reducing KCl outflow and contamination—particularly from silver sulfide precipitates in fermenters—thereby extending service life and measurement accuracy. The hydrogel may be a stimuli-responsive "smart" hydrogel (ion-strength or thermoresponsive). Manufacturing involves inserting the dry hydrogel into an annular gap between inner and outer tubes before introducing the conductive fluid to induce swelling and sealing.
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Date
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EP4137810
- Application Number
- EP22201337A
- Filing Date
- Dec 10, 2019
- Status
- Granted And Under Opposition
- Jun 13, 2025
- Publication Date
- Jul 16, 2025
- External Links
- Slate, Register , Google Patents