By Instrument Society Of America
Offers a procedure of image symbols for conveying details on visible reveal devices (VDUs) used for method tracking and keep an eye on. Covers either colour and monochromatic screens. supplementations ISA-5.1-1984 (R1992) and ISA-5.3-1983.
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Additional resources for Graphic Symbols for Process Displays Ansi Isa-S5.5 (Standards & Practices for Instrumentation & Control)
Example text
NOTE 4: First letter ’A’ for analysis covers all analyses not described by a "USER’S CHOICE" letter. It is expected that the type of analysis will be defined outside the symbol. The units of the quantity measured will assist in determining the actual type of analysis occurring. Additional information can be added as text to the Visual Display Unit. NOTE 5: Use of the first letter ’U’ for "Multivariable" in lieu of a combination of first letters is optional. It is recommended that nonspecific designators such as ’U’ be used sparingly.
Conditions that are hazardous to personnel and/or equipment and that are not expected to arise normally. The designation ’PSV’ applies to all valves intended to protect against emergency pressure conditions regardless of whether the valve construction and mode of operation place them in the category of the safety valve, relief valve, or safety relief valve. ’ NOTE 9: The passive function ’G’ applies to instruments or devices that provide an uncalibrated view such as sight glasses and television monitors.
5-1985 37 Appendix B — Primary measurement recommended usage Primary elements or instruments can be depicted on a VDU by a character(s). 5-1985 39 NOTE 1: A "USER’S CHOICE" letter is intended to cover unlisted meanings for primary measurements that will be used repetitively in a particular project. If used, the letter will have one meaning as a first letter and a different meaning for the second letter. The meanings need be defined only once in the beginning of the project. For example, the letter ’M’ may be defined as "MOISTURE" in one project, but as "MASS" in another.