A Microprocessor-Controlled Water-Pollution monitoring System

A water-quality monitor was designed and built to sample water flowing over a weir in White Oak Creek near the Oak Ridge National Laboratory (ORNL). ORNL is required to sample the water at regular volume intervals to determine whether it meets federal water-quality standards. Because the monitor must yield a high accuracy (0.1%) in measuring water volume and high repeatability (0.1%) of sample size and demonstrate long-term stability (low drift), a digital control system using a microprocessor was developed to replace the analog controller in an existing monitor. tract with the Union, Carbide Corporation.