Electrochemical sensor instrumentation
US4468608A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1981 |
| Grant date | Aug 28, 1984 |
| Priority date | — |
| Expiry date | Dec 11, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4165
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electrochemical sensor system includes a high impedance ion selective electrode and an electrode test circuit that has an isolation capacitor connected between the output signal lead from the ion selective electrode and a test voltage terminal, and a monitoring circuit connected to respond to the output signal from the electrode. The isolation capacitor is a high quality capacitor and provides a shunt impedance that is much higher than the maximum electrode impedance. A voltage transition at the test voltage terminal is coupled by the isolation capacitor to the output lead and the resulting decay rate of the voltage transition on the output lead is monitored to provide an indication of the quality of the electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.