ANSI/ISA-71.04 : 2013

Environmental Conditions for Process Measurement and Control Systems: Airborne Contaminants, classifies airborne contaminants and biological influences that affect electronic equipment such as process control instruments, IT hardware, networking equipment and office electronics. This standard provides a clear method to specify the types and concentrations of liquids, solids and gases in the environment that can impact equipment reliability and lifespan. It categorizes contaminants into classes with severity levels based on measurable effects like corrosion rates on copper and silver samples. This helps manufacturers and users communicate environmental conditions accurately and make informed decisions about equipment design, installation and maintenance. It also addresses how factors like humidity and temperature influence contamination effects and includes methods for monitoring corrosive environments through standardized testing.