Yokogawa RotaMASS 3-Series - Manual (Page 251)

A2 SAFETY INSTrUMENTEd SYSTEMS INSTAllATION
A2-3
IM 01R04B04-00E-E 8th edition March 01, 2011 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
A2.2.6 repair and replacement
Maintenance information can be found in section 8, Self-diagnostic and Troubleshooting of the User’s
Manual ROTAMASS 3 Series Coriolis Mass Flow and Density Meter Integral Type RCCT3, Remote Type
RCCF31 + RCCS3, Remote Type RCCR31 + RCCS3, IM 01R04B04-00E-E.
If repair is to be performed with the process online the Yokogawa ROTAMASS 3 Series Coriolis Mass Flow
and Density 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 Yokogawa ROTAMASS 3 Series Coriolis
Mass Flow and Density Meter should have a sufficient skill level.
A2.2.7 Startup Time
The flowmeter will generate a valid signal within 20 seconds of power-on startup with the default 3 second
dampening time. Increasing the configurable dampening time adds to the startup time.
A2.2.8 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.
A2.2.9 reliability data
A detailed Failure Mode, Effects, and Diagnostics Analysis (FMEDA) report is available from Yokogawa with
all failure rates and failure modes. The Yokogawa ROTAMASS 3 Series Coriolis Mass Flow and Density
Meter is intended for use in a Low Demand Mode. Low Demand Mode means the average interval between
dangerous conditions occurs infrequently.
The Yokogawa ROTAMASS 3 Series Coriolis Mass Flow and Density Meter is certified up to SIL2 for use
in a simplex (1oo1) configuration, depending on the PFDavg calculation of the entire Safety Instrumented
Function. The development process of the Yokogawa ROTAMASS 3 Series Coriolis Mass Flow and Density
Meter is certified up to SIL3, allowing redundant use, with hardware fault tolerance of 1, of the flowmeter up
to this Safety Integrity Level, depending the PFDavg calculation of the entire Safety Instrumented Function.
When using the Yokogawa ROTAMASS 3 Series Coriolis Mass Flow and Density Meter in a redundant
configuration, the use of a common cause factor (
β
-factor) of 2% is suggested.
A2.2.10 lifetime limits
The expected lifetime of the Yokogawa ROTAMASS 3 Series Coriolis Mass Flow and Density Meter is 10
years. The reliability data listed in A2.2.9 is only valid for this period. The failure rates of the Yokogawa
ROTAMASS 3 Series Coriolis Mass Flow and Density Meter may increase sometime after this period.
Reliability calculations based on the data listed in A2.2.9 for Yokogawa ROTAMASS 3 Series Coriolis Mass
Flow and Density Meter lifetimes beyond 10 years may yield results that are too optimistic, i.e. the calculated
Safety Integrity Level will not be achieved.
A2.2.11 required parameter Settings
The following parameters need to be set in order to maintain the designed safety integrity.
High – Low (Burn-out) jumper To specify if the output should go high (≥ 21.6 mA) or low
(≤ 3.6 mA) upon detection of an internal failure.
Write Protect (Security) The write function should be disabled.