流程图的图例符号
吴成
国内标准规范
GB/T2625-1981 过程检测和控制流程图用图形符号和文字代号Prccess detection and control flow chart--Symbols and letter codes
SHB-Z02-95 仪表符号和标志Instrumentation symbols and identification （idt ISA S5.1-1984） SHB-Z04-95 分散控制/集中显示仪表、逻辑控制及计算机系统用流程图符号Graphic
symbols for distributed control/shared display instrumentation, logic and computer systems
（idt ISA S5.3-1983）
国外标准规范
ISA S5.1-1984 (R1992) Instrumentation Symbols and Identification
仪表盘标志ISA S5.3-1983Graphic Symbols for Distributed Control/Shared Display Instrumentation, Logic and Com
puter Systems
DIN 19227-1-1993Control technology; graphical symbols and identifying letters for process control engineering; symbolic representation for functions
国外标准规范
ISA S5.1-1984 (R1992) Instrumentation Symbols and Identification
ISA S5.3-1983Graphic Symbols for Distributed Control/Shared Display Instrumentation, Logic and Computer Systems
DIN 19227-1-1993Control technology; graphical symbols and identifying letters for process control engineering; symbolic representation for functions
关于ISA S5.1
ISA 英文全称为“Instrument Society of America ”，中文全称为“美国仪表协会” ISA在1945 年3 月28 日成立于宾西法尼亚州（Pennsylvania）的匹兹堡（Pittsburgh）
ISA标准的出版由美国国家标准学会American National Standards Institute (ANSI)授权
ISA S5.1最新版本是R1992，预计2006升版
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