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LRGT 1x-x - Installation & Operating Manual -
819877-00
Specialist terms/Abbreviations
Here, we explain some abbreviations, specialist terms, etc., which are used in this Manual.
IEC 61508
International standard IEC 61508 describes both the type of risk assessment and actions taken to provide
appropriate safety functions.
SIL (safety integrity level)
Safety integrity levels SIL 1 to 4 are used to quantify risk reduction. SIL 4 is the highest level of risk reduction.
International standard IEC 61508 forms the basis for establishing, testing and operating technical safety
systems.
LRGT .. / LRR .. / URS .. / URB .. / SRL .. / etc.
Equipment and type designations of GESTRA AG.
SELV
Safety Extra Low Voltage
Operating point (of the system)
The operating point describes the operating parameters at which a plant or boiler is operated in the
nominal range. In a pressurised steam plant, for example, these parameters would be output, pressure
and temperature.
The design data may be a lot more stringent, however.
A boiler that is operated at 10 bar and 180 °C may be designed for a pressure of 60 bar and a tempera-
ture of 275 °C, for example, which is not necessarily its operating point.
