Reference electrode and method of making it
US4891125A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1989 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Apr 12, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/301
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A miniaturized reference electrode includes a dielectric thermoplastic cup having a cavity to hold a reference liquid solution and having a sample contacting orifice at one end. A membrane comprising cellulose acetate and a solvent capable of exerting a solvent action on the sidewalls of the cup orifice is drop deposited in the orifice and cured in situ. The resulting membrane extends across the orifice and is interdigitatedly anchored to the orifice sidewalls. The reference electrode further includes an Ag/AgCl screw-in electrode machined from silver rod extending into and hermetically sealing the cup cavity. A reference liquid fill solution having a chloride ion and potassium ion concentration similar to that found in the samples to be tested and the storage soak solution is provided to minimize drift of reference potential. The miniature reference electrode is intended for use with a miniaturized ISE half cell in a test cartridge on a centrifugal clinical analyzer to determine electrolyte concentrations in fluid samples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.