Air pollution effects field research facility: Ozone flow control and monitoring system

The Ozone Flow Control and Monitoring System was developed in 1986 for the controlled exposure of diverse plant species to various concentrations of ozone gas. Design, operation, and performance are described for the automated system for generation, distribution, sampling, analysis, and control of ozone gas for plant exposure. The system has proved to be reliable, easy to maintain, and flexible in adapting to exposure programs. System software is reliable, and the user interface (CRT keyboard) is easy to use, providing quick-glance viewing of overall exposure conditions. The capability to expose plants to ozone concentrations in multiples of the ambient ozone level has been added, and software improvements in the areas of system response and user input are planned. 19 figs., 3 tabs.