ISO 8999 pdf download – Reciprocating internal combustion engines -Graphical symbols

ISO 8999 pdf download – Reciprocating internal combustion engines -Graphical symbols.
it is applicable to RIG engines for land, rad traction and manne use. eccluding engines used to propel road vehicles and aircraft.
2 Normative references
The following normative documents caniain provisions which, through reference in this text, constitute provisions of mis International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility ot applying the most recent editions of the normatNe documents indicated below, For undated references, the latest edition of the normative document referred to applies. Members of ISO and lEG maintain registers of currently valid International Standards.
ISO 3461-1 1988, General pnncipfes for the creation of graphical symbols — Part 1: Graphical symbols for use on 6—f,
1S03864:1984, Safety colours and safety signs.
IEC 60073:1996, Basic and safety principles to, man•mach,ne interface. marking and idefltif4CattOn — Coding phncles for indication devices and actuators.
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
4.5Limitations inherent in some reproduction and display technologies may require increased line thickness orother minor modifications of symbols. Such modifications are acceptable provided the symbol remain unchanged inits basic graphical elements and remain easily discernible by the operator.
4.6Aodditionally , to improve the appearance and perceptibility of a graphical symbol or to coordinate with thedesign of the equipment to which it is applied, it may be necessary to change the line thickness or to round off thecormners of the symbol. The graphical designer is normally free to make such changes provided that the essentialperceptual characteristics of the symbol be maintained.See 10.2 of ISO 3461-1:1988.
4.7For actual use, all symbols shall be reproduced large enough to be easily discernible by the operator. SeeISO 3461-1 for guidelines for proper sizing of symbols.Symbols shall be used in the orientations shown in thislnternational Standard unless otherwise noted for individual symbols.
4.8Symbols on controls and displays shall have good contrast to their background.A light symbol on a darkbackground is preferred for most controlis. Displays may use either a light symbol on a dark background or a darksymbol on a light background, depending upon which alternative provides the best visual perception.When asymbol image is reversed (for example, black to white and vice versa) it shall be done for the entire symbol.
4.9When using symbols with multifunction controls，understanding is improved and the presentation simplifiedwhere symbols are combined to the least extent possitble. The example shown in Figure 1 is for a typical engineoperation key switch, having separate positions for Off, On and Start.
4.10 The fonts shown in this International Standard are not intended to be restrictive;other fonts may besubstituted, but care shall be taken that legibility is maintained
4.11 Symbols in this International Standard are presented 32 % of original size. The grid marks L” denote thecorners of the 75 mm square of the graphic grid presented. The grid marks are not part of the symbol but areprovided to ensure consistent presentation of all symbol graphics.