ASME Y14.40.6:2002 pdf download

ASME Y14.40.6:2002 pdf download.GRAPHICAL SYMBOLS FOR DIAGRAMS, PART 6: MEASUREMENT AND CONTROL FUNCTIONS
1 SCOPE
This Standard specifies graphical symbols for mea- surement and control functions in diagrams, with the same symbols in simple applications possibly represent- ing instead components or devices implementing such functions. For graphical symbols for measurement and control components and devices, see ASME Y14.40.5. For the fundamental rules of creation and application of graphical symbols in diagrams, see ASME Y14.40.0. For an overview of the ASME Y14. 40 series, informa- tion on the creation and use of registration numbers for identifying graphical symbols used in diagrams, rules for the presentation and application of these symbols, and examples of their use and application, see ASME Y14.40.1.
2 REFERENCES
The following references contain provisions which, through refercnce in this text, constitutc provisions of this Standard. For dated references, subsequent amend- ments to, or revisions of any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the references indicated below. For undated references, the latest edi- tion applies. ASME Y14.40.0, Basic Rules for the Design of Graphical Symbols for Use in the Technical Documentation of Products ASME Y14.40.1, Graphical Symbols for Diagrams, Part 1: General Information and Indexes ASME Y14.40.2, Graphical Symbols for Diagrams, Part 2: Symbols Having General Application
3 TERMS AND DEFINITIONS
For the purposes of this Standard, the following terms and definitions apply. 3.1 conirol: purposeful action on or in a system to meet specified objectives. NOTE: Control may include monitoring and safeguarding in addi- tion to the control action itself. 3.2 operation: transfer of mechanical parts. EXAMPLE: The closing member of a shut off valve or the contacts of an electromechanical switching device. NOTES: (1) The transfer direction may be defined as an opening operation, closing operation, ON-operation, OFF-operation, etc. (2) The term has a specific meaning in cunjunction with electric measuring relays. An over/ under -relay is operating when its characteristic quantity reaches the set value by increasing/ decreasing in value (IEC 60050 448). 3.3 manun! control: contro! of an operation by human inter- vention. 3.4 automatic: (control, operation) self-acting (not needing human intervention). 3.5 final controlling eleinienit. element that directly changes the output variable of a controlling system (manipulated variable). 3.6 delay device: device providing a time interval between the instant when an actuating force is applied or removed and the instant when the consequent change of position or state of the affected parts start. 3.7 uuiomiuiic reiurn device: device for returning movable parts, such as those of a valve to initial position (at-rest position), after an actuating force has been removed. 3.g detent: device that retains movable parts, for example, those of a valve, in a certain position until sufficient force is applied to overcome the detaining force in order to movc the parts to another position. 3.9 latching device: mechanical device giving movable parts, for example, those of a valve, the possibility to move in one direction but preventing them from returming until the latch has been rclcased. 3.10 blocking device: mechanical device preventing movable paris, for example, those of a valve, from mnoving in any direction until the blocking device has been released. 3.11 interiocking device: mecharicai device making the opera- tion of movable parts of one component, for example, a contactor, dependent on the position or state of another component with movable parts. 3.12 informuion processing: performing of operatiors on daia to obtain or treat information. 3.13 primary location: location of measuring instruments, potentiometers etc., accessible to an operator, cf. auxiliary location (3.14). 3.14 auxiliary location: location of measuring instruments, potentiometers, etc. not accessible to an operator, for example, behind a panel, cf. prirury locaiion (3.13).