Fabrication and Testing of a Miniaturised Water Quality Monitoring pH and Conductivity Sensors

M.H. Banna, H. Najjaran, R. Sadiq, M.J. Rodriguez, S.A. Imran, M. Hoorfar
University of British Columbia, CA

Keywords: online water quality monitoring, pH, conductivity

Summary:

Development of cost-effective, durable and sensitive on-line water quality monitoring sensors that can be installed across the water distribution network has attracted attentions to increase the frequency of monitoring and hence reduce the risk of accidental or deliberate contaminations. This paper presents micro-sensors fabricated and implemented in a serpentine channel for the measurement of pH and conductivity, two important water quality parameters. The sensors are fabricated using hydrogel coated gold electrodes. The performance of these sensors was tested in both still (static) and flowing (dynamic) water. The serpentine channel, numerically optimized, provides a constant flow and constant outlet pressure condition for dynamic experiments. The results show that for flow rates less than 30 mL/min the values obtained in the dynamic experiments are similar to those measured in the static condition. Tests conducted for evaluating the sensors lifetime show no change in the performance even after one month.