INTEGRATED CHLORINE SENSOR FOR DRINKING-WATER DISTRIBUTION SECURITY SYSTEMS

Free chlorine is generally monitored in drinking water in order to mai ntain and check the quality of the water. Low level detection of chlor ine in a water distribution network is conferring a good water quality confidence. It is confirmed by recent field tests that a very low lev el of free chlorine present in the form of hypochlorous acid can be de tected with a recently developed integrated electrochemical sensor [1] . The three-electrode planar amperometric microsensor is industrially manufactured on 4 inch silicon wafers using a microelectronic technolo gy compatible with a CMOS process. Field tests over several months in 'on-line' drinking water networks have already demonstrated the indust rial importance of such a technology.