<A2. SAFETY INSTRUMENTED SYSTEMS INSTALLATION>
A2-3
IM 01R01B02-00E-E 12th edition October 01, 2014 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
When all the tests listed above are executed a proof test coverage of approximately 99% of possible DU
failures in the variable area flow meter RAMC can be claimed.
The following tools need to be available to perform proof testing:
• Flow meter display or alternatively for digital communication ([V2] only): HART Handheld, PRM or FieldMate
• Measurement instrument to verify output status [V1] or output current [V2]
The person(s) performing the proof test of the Yokogawa RAMC variable area flow meter should be trained in
SIS operations including bypass procedures, flow meter maintenance and company management of change
procedures.
A2.2.5 Repair and replacement
Maintenance information can be found in section 8, Maintenance of the User’s Manual Model RAMC Short
Stroke ROTAMETER, IM 01R01B02-00E-E.
If repair is to be performed with the process online the Rota Yokogawa RAMC variable area flow meter will
need to be bypassed during the repair. The user should setup appropriate bypass procedures for that.
Contact the Yokogawa sales office if this instrument requires repair
The person(s) performing the repair and / or replacement of the Rota Yokogawa RAMC variable area flow
meter should have a sufficient skill level.
A2.2.6 Startup Time
The flow meter will generate a valid signal within 3 seconds of power-on startup with the default 1 second
dampening time. Increasing the configurable dampening time adds to the startup time.
A2.2.7 Firmware update
In case firmware updates are required they will be performed at factory. The replacement responsibilities are
then in place. The user will not be required to perform any firmware updates.
A2.2.8 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 RAMC variable area flow meter is intended for use in
a Low Demand Mode. Low Demand Mode means the average interval between dangerous conditions occurs
infrequently.
The Rota Yokogawa RAMC variable area flow meter is certified up to SIL2 for use in a simplex (1oo1)
configuration, depending on the PFDAVG calculation of the entire Safety Instrumented Function.
A2.2.9 Lifetime limits
The expected lifetime of the Yokogawa Rota Yokogawa RAMC variable area flow meter is 10 years. The
reliability data listed in A2.2.8 is only valid for this period. The failure rates of the Rota Yokogawa RAMC
variable area flow meter may increase sometime after this period. Reliability calculations based on the data
listed in A2.
2.8 for Rota Yokogawa RAMC variable area flow meter lifetimes beyond 10 years may yield
results that are too optimistic, i.e. the calculated Safety Integrity Level will not be achieved.
A2.2.10 Required parameter settings
The Float Blocking Detection System must be activated for 4-20mA Type [V2].
Summary of Contents for RAMC
Page 2: ...Blank Page ...
