Integrated monitor and control system for continuously monitoring and controlling pH and free halogen in swimming pool water

摘要

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 operational amplifier in electric connection with the second cell and arranged to respond to a halogen concentration outside a predetermined range and give a signal; second means responsive to the signal to adjust halogen concentration in the pool water to restore halogen concentration to within the predetermined range; and means for circulating pool water to, through and from each electrochemical cell and to and from a swimming pool water supply.