Differential conductivity meter for fluids and products containing such meters
US5087883A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1990 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Sep 10, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/07
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for detecting relative differences in conductivity between filtered and unfiltered states of fluid comprises a differential comparator for measuring the voltage difference of its input ports, a differential bridge connected to the input sorts of the differential comparator for measuring the conductivity of the fluid, the differential bridge having electrodes for contacting the fluid in each of its filtered and unfiltered states and bridge adjustment circuitry for compensating for voltage offsets of the comparator and the bridge, and an indicator connected to the output of the comparator for generating an output indicative of the differential conductivity of the fluid in its filtered and unfiltered states.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.