Supply takes the lead in lead removal
A
Weidmuller (UK) product story
Edited by the Engineeringtalk editorial team
Jan 14, 2003
Tyco International's modular dosing system is widely used at water treatment plants, and uses Weidmuller's CP-SNT 160W switched mode power supply unit for safe and reliable 24V DC power.
Current UK water quality legislation demands ever more stringent reductions in the lead content of drinking water, especially for older premises where lead pipework is still in place or cannot be removed.
Tyco International's modular dosing system is widely used at water treatment plants, depending on Weidmuller's CP-SNT 160W switched mode power supply unit for safe and reliable 24V DC power.
The Tyco dosing system is a self-contained module, which is delivered to site assembled and tested, requiring only connection of water, power and the orthophosphoric acid.
The orthophosphoric acid is dosed in low ppm and coats the interior of lead pipes with an insoluble molecular lining of lead orthophosphate, thus preventing contact between lead and water - especially important in soft water areas of the UK, or where water hardness has been modified.
A reliable, efficient 24V DC power supply, despite variations in incoming voltage, is key to precise operation of the PLC-based dose control system, which measures actual phosphate content in the incoming water and, with a dosing pump, meters orthophosphoric acid into the water.
Weidmuller's CP-SNT 160W was selected for the combination of its compact size, known reliability and excellent value.
The dose control system adjusts the levels to the prescribed drinking water quality standards, which have a maximum allowable total phosphate level.
Variations in phosphate levels could have consumer health implications, so accuracy and consistent performance of this task is critical.
The Weidmuller CP-SNT 160W primary switched mode power supply can provide a range of output voltages and currents, from 5V DC/ 8A to 48V DC/ 3.5A, from input voltages between 85 and 250V AC at 50 or 60Hz.
DC inputs can also be used up to 375V DC.
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