Yokogawa RAGN - Manual (Page 43)

<A1. SAFETY INSTRUMENTED SYSTEMS INSTALLATION>
A1-3
IM 01R01B10-00E-E 2nd edition: November 01, 2011-00 All Rights Reserved. Copyright © 2011, Rota Yokogawa
A1.2.6 Startup Time
The flow meter will generate a valid signal within 0.5 seconds of power-on startup.
A1.2.7 Reliability data
A detailed Failure Mode, Effects, and Diagnostics Analysis (FMEDA) report is available from Rota Yokogawa
with all failure rates and failure modes. Rota Yokogawa RAGN Glass Rotameter is intended for use in a Low
Demand Mode. Low Demand Mode means the average interval between dangerous conditions occurs
infrequently.
The Rota Yokogawa RAGN Glass Rotameter is certified up to SIL1 for use in a simplex (1oo1) configuration,
depending on the PFDAVG calculation of the entire Safety Instrumented Function.
A1.2.8 Lifetime limits
The expected lifetime of the Yokogawa Rota Yokogawa RAGN Glass Rotameter is 10 years. The reliability
data listed in A1.2.7 is only valid for this period. The failure rates of the Rota Yokogawa RAGN Glass
Rotameter may increase sometime after this period. Reliability calculations based on the data listed in A1.2.7
for Rota Yokogawa RAGN Glass Rotameter lifetimes beyond 10 years may yield results that are too optimistic,
i.e. the calculated Safety Integrity Level will not be achieved.
A1.2.9 Environmental limits
The environmental limits of Rota Yokogawa RAGN variable area flow meter are specified in the User’s
Manual, Model RAGN Glass Rotameter, IM 01R01B10-00E-E.
A1.2.10 Application limits
The application limits of the Rota Yokogawa RAGN variable area flow meter are specified in the User’s
Manual, Model RAGN Glass Rotameter, IM 01R01B10-00E-E. If the flow meter is used outside of the
application limits the reliability data listed in A1.2.7 becomes invalid.