GB/T 13639-2008

This standard specifies the technical requirements, test methods, and inspection rules for digital indicators that receive analogue input signals, such as 4-20 mA or thermocouple voltages, within industrial-process measurement and control systems. It is applied in manufacturing environments, including factories and process plants, to ensure the accuracy, reliability, and interchangeability of digital displays used for monitoring parameters like temperature, pressure, or flow. The standard is relevant for equipment procurement, quality assurance, and performance verification in sectors such as chemical processing, power generation, and automated production lines.