ISO 8999:2001 pdf download

ISO 8999:2001 pdf download.Reciprocating internal combustion engines一Graphical symbols.
4.2 The symbols included in clause 5 are basic symbols which may be used for general application as well as to create composite symbols.
4.3 The composite symbols included in clauses 6 and 7 are developed using basic symbols from clause 5 as elements where applicable to provide families of symbols associated with functions and systems.
4.4 As required, additional composite symbols may be developed using the basic symbols from clause 5, provided that the characteristics specified in ISO 3461-1 be maintained.
4.5 Limitations inherent in some reproduction and display technologies may require increased line thickness or other minor modifications of symbols. Such modifications are acceptable provided the symbol remain unchanged in its basic graphical elements and remain easily discernible by the operator.
4.6 Additionally, to improve the appearance and perceptibility of a graphical symbol or to coordinate with the design of the equipment to which it is applied, it may be necessary to change the line thickness or to round off the corners of the symbol. The graphical designer is normally free to make such changes provided that the essential perceptual characteristics of the symbol be maintained. See 10.2 of ISO 3461-1:1988.
4.7 For actual use, all symbols shall be reproduced large enough to be easily discernible by the operator. See
ISO 3461-1 for guidelines for proper sizing of symbols. Symbols shall be used in the orientations shown in this
International Standard unless otherwise noted for individual symbols.
4.8 Symbols on controls and displays shall have good contrast to their background. A light symbol on a dark background is preferred for most controls. Displays may use either a light symbol on a dark background or a dark symbol on a light background, depending upon which alternative provides the best visual perception. When a symbol image is reversed (for example, black to white and vice versa) it shall be done for the entire symbol.
4.9 When using symbols with multifunction controls, understanding is improved and the presentation simplified where symbols are combined to the least extent possible. The example shown in Figure 1 is for a typical engine operation 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 be substituted, 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 the corners of the 75 mm square of the graphic grid presented. The grid marks are not part of the symbol but are provided to ensure consistent presentation of all symbol graphics.
4.12 Microfiches of the symbols are available from the ISO/TC 145 Secretariat.
4.13 When used on optical indicators or tell-tales, the following colours have the meanings indicated:
— red: danger, unsafe or malfunction
— yellow or amber: caution green: safe or normal
NOTE Where practical, the indicators should be banded such that red is positioned above yellow/amber which is positioned above green.