Water Science & Technology: Water Supply Vol 1 No 2 pp 211–216 © IWA Publishing 2001
Development of an on-line chlorine sensor for water quality monitoring in
public distribution networks
J Gobet*, P Rychen**, C Madore***, N Skinner****, H van Buel***** and F Jaggi******
*
CSEM SA, Jaquet-Droz 1, CH-2007 Neuchâtel, Switzerland
**
CSEM SA, Jaquet-Droz 1, CH-2007 Neuchâtel, Switzerland
***
CSEM SA, Jaquet-Droz 1, CH-2007 Neuchâtel, Switzerland
****
CSEM SA, Jaquet-Droz 1, CH-2007 Neuchâtel, Switzerland
*****
Cla-Val SA, Ch. des Mésanges 1, CH-1032 Romanel, Switzerland
******
Cla-Val SA, Ch. des Mésanges 1, CH-1032 Romanel, Switzerland
ABSTRACT
A new on-line free chlorine sensor based on a microdisc electrode array is
presented. The sensor is microfabricated using microelectronic-based
processes. Sensor characteristics include a good linearity in the
0-1 mg/l range, a sensitivity of 13 nA/(mgCl2/l) with a
detection limit of 0.02 mg/l of free chlorine. The sensor response has a
low pH and flow dependence. A very good stability over 4 weeks of
continuous use in drinking water is demonstrated. Mounted on an
automatic control valve the sensor will offer the possibility to
monitor and control the water quality in a distribution network.
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