Integrated monitor and control system for continuously monitoring and controlling pH and free halogen in swimming pool water
US4033871A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1975 |
| Grant date | Jul 5, 1977 |
| Priority date | — |
| Expiry date | Nov 13, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2509
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An integrated monitor and control system for continuously monitoring and controlling pH and free halogen concentration in swimming pool water is provided, comprising, in combination, a first electrochemical flow cell having two electrodes and through which swimming pool water flows, giving rise to an electric potential between the electrodes in proportion to hydrogen/hydroxyl ion concentration in the pool water; means for measuring the electric potential across the electrodes in a manner correlated with pH of the pool water; a second electrochemical flow cell having two electrodes and through which swimming pool water flows giving rise to an electric potential between the two electrodes in proportion to the oxidation/reduction potential of the pool water; means for measuring the electric potential across the electrodes in a manner correlated with halogen concentration in the pool water; a first operational amplifier in electric connection with the first cell and arranged to respond to a pH outside a predetermined range and give a signal; first means responsive to the signal to adjust alkali or acid content of the pool water to restore pH to within the predetermined range; a second …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.