ISO 14617-2-2002 pdf free download.Graphical symbols for diagrams – Part 2: Symbols having general application. 3.17 characteristic quantity measuring device) quantity whose name characterizes the device and its function EXAMPLE The characteristic quantity for a safety valve is “pressure”; for an overcurrent relay, current”. [IEC 60050-4461 3.18 pilot switch monitoring device actuated In response to specified conditions of a non-electric characteristic quantity EXAMPLE Pressure, temperature, speed, flow rate o liquid level. [IEC 60050441) 3.19 logic negation condition mainly used with binary logic elements where the logic state 1 (TRUE) is converted to a logic state 0 (FALSE) or vice versa [IEC 60617-12. IEC 61082-2) 3.20 logic inversion condition mainly used with binary logic elements where a higher physical level Is converted to a lower physical level or vice versa [IEC 6061 7-12, IEC 61082-2) 3.21 feedback controller device in which the control action is made to depend on the measurement of the controlled variable [IEC 60050-351) 3.22 variability ability of changing a property cf. adjustability (3.23) and inherent variability (3.25) 3.23 adjustability ability to adjust the setting of a component or device [IEC 60050-371J cf, variability (3.22) 3.24 pre-set adjustability ability to adjust the setting of a component or device before normal service.ISO 14617-2 pdf download.
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