Instrument Society Of America's Graphic Symbols for Process Displays Ansi Isa-S5.5 PDF

By Instrument Society Of America

Offers a approach of photo symbols for conveying info on visible exhibit devices (VDUs) used for strategy tracking and keep an eye on. Covers either colour and monochromatic monitors. supplementations ISA-5.1-1984 (R1992) and ISA-5.3-1983.

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Extra resources for Graphic Symbols for Process Displays Ansi Isa-S5.5 (Standards & Practices for Instrumentation & Control)

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NOTE 2: The unclassified letter ’X’ is intended to cover unlisted meanings that will be used only once or to a limited extent. If used, the letter may have any number of meanings as a first letter and any number of meanings as a succeeding letter. Except for its use with distinctive measurements, it is expected that the meaning will be defined outside the symbol. For example, ’X’ may be a stress measurement at one point and a volume measurement at another point. The units of the quantity measured will assist in determining the actual usage of the letter ’X’.

1). NOTE 16: The terms "high" and "low," when applied to positions of valves and other openclose devices, are defined as follows: "high" denotes that the valve is in or approaching the fully open position, and "low" denotes it is in or approaching the fully closed position. NOTE 17: The word "record" applies to any form of permanent storage of information that permits retrieval by any means. 1. NOTE 19: First letter ’V,’ "Vibration or Mechanical Analysis," is intended to perform the duties in machinery monitoring that the letter ’A’ performs in more general analyses.

NOTE 13: A device that connects, disconnects, or transfers one or more circuits may be either a switch, a relay, an ON-OFF controller, or a control valve, depending on the application. If the device manipulates a fluid process stream and is not a hand-actuated ONOFF block valve, it is designated as a control valve. It is incorrect to use the succeeding letters ’CV’ for anything other than a self-actuated control valve. For all applications, other than fluid process streams, the device is designated as follows: A switch, if it is actuated by hand.

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