Method and apparatus for taking samples from a groundwater monitoring site
US5224389A · kind A · utility
10Cited by
10References
8Claims
0Family size
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Key dates
| Filing date | Dec 5, 1990 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Dec 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N1/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for taking samples from a groundwater monitoring site realized by measuring an electric conductivity of contaminated groundwater during operating a pump at high r.p.m. and by controlling a predetermined minimum variation of the electric conductivity over a predetermined period of time with subsequent operating of the pump at low r.p.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.