• The Challenge The water used in the cooling towers at a power plant is treated with chemicals to prevent corrosion of the steam piping. The water is cycled through a holding pond, and environmental safety requires that any excess water be purified before being returned to a river . So plant operators must continually monitor and control the water level in the holding pond. A power plant in Georgia wanted to be able to do the monitoring from a remote location. • The Solution An instrument and controls technician at the plant contacted B&B Electronics for help. The solution was B&B’s Zlinx wireless Modbus I/O base module (ZZ9D-NA-LR.) The base module transfers a 4 - 20 mA signal from a level sensor that monitors pond depth. The module has two analog inputs and outputs, an

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