30 April 2009
Forty ABB 4670 series turbidity monitors were installed in boreholes at water treatment sites across the region in the south of England. Water is extracted from the boreholes and fed to treatment works. Steve Tough, ICA section leader for Hampshire and the Isle of Wight, said: ‘At our treatment works, we have several boreholes feeding a common main. Previously we had a turbidity monitor only in the main itself but we now want to monitor each borehole separately. The benefit of this is that if, for example, pump three is experiencing high turbidity, we can shut that one down and use others.’ABB supplied the monitors installed on a backboard with appropriate piping in place, allowing Southern Water to install the boards in standard cabinets. The backboards have space to accommodate a de-bubbler, as well as immersion sensors, providing a complete solution for all drinking water processing, process water and sewage treatment processes. ‘During the selection process for the turbidity units, it became clear in discussions with ABB that they could supply everything we needed,’ said Tough. ‘We needed to use a small cabinet to house the monitors so a compact size was vital. The ABB unit is smaller than other similar units, so was ideal for our application. Also, in tests, it was shown to operate well over a wide range of temperatures, from zero to thirty degrees. We also found that it was reliable, easy to calibrate and maintain and gave good results.The unit of measurement for turbidity is NTU (Nephelometric Turbidity Units). To be totally secure, most water companies have a policy of not exceeding 0.2 NTU in the final drinking water. Accurate monitoring is important to make sure that the water is safe to drink and that companies are complying with Drinking Water Inspectorate standards. The ABB 4670 has ranges configurable between 0 to1 NTU and up to 250 NTU and 2,000 FTU. It comes supplied complete with an auto-cleaning function, which optimises performance and reduces maintenance.
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