ISA-5.5-1985 Graphic Symbols for Process Displays

USA: ISA, 1985. — 48 p. The purpose of this standard is to establish a system of graphic symbols for process displays that are used by plant operators, engineers, etc., for process monitoring and control. The system is intended to facilitate rapid comprehension by the users of the information that is conveyed through displays, and to establish uniformity of practice throughout the process industries. Resulting benefits are intended to be as follows:
a decrease in operator errors, a shortening of operator training, better communication of the intent of the control system designer to the system users.
An objective of the standard is to insure maximum compatibility of symbols on process visual display units (VDUs) with related symbols used in other disciplines. The symbols in this standard are intended to depict processes and process equipment. The symbols are suitable for use on Visual Display Units (VDUs), such as Cathode Ray Tubes (CRTs).