Connected Intelligence Reference Design
Remote Monitoring of Power Plant Holding Pond
B+B SmartWorx - Ottawa, United States
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.
An instrument and controls technician at the plant contacted B+B SmartWorx 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, and two digital inputs and outputs. (In this case, only one of the analog I/Os was needed.) The signal is sent to the control station over an RF link, where a second Zlinx Modbus I/O module replicates the 4 - 20 mA signal and passes it along to the PLC that controls the cooling tower operation.
Model ZZ9D-NA-LR – Zlinx Wireless Modbus I/O Base Modules
Model YS8963 – Wireless Antennas
Model 400M-NMSL – Wireless Antenna Cables with SMA Reverse Polarity Plugs
B+B SmartWorx products Used in this Reference Design