IM 01E21A21-02EN
<2. Safety Instrumented Systems Installation>
8
2.2.7 Repair and Replacement
It is necessary for user to have adequate bypass line in order to accommodate repair work of this product
when process is running.
Contact YOKOGAWA for the detected failure on this product.
To replace this product, it is necessary to follow procedure described in installation manual as listed in Table
1.1.
Replacement work for this product should be done by trained personnel.
2.2.8 Startup Time
This product generates a valid signal within 3 seconds when its damping time constant is set as 0.1 seconds.
2.2.9 Firmware Update
The user will not be required to carry out any firmware updates.
When its updates work is required, it must be carried out at YOKOGAWA.
2.2.10 Reliability Data
Refer to the FMEDA report (YEC 16/03-009 R002 V2R4) for failure rates and failure modes. The FMEDA
Report can be downloaded from the website below.
Website address: https://www.yokogawa.com/library/
The device is capable of applying up to SIL 3 in a redundant configuration (HFT=1, 2) (PFDavg calculation of
the entire safety instrumentation function according to the SIL to be applied is required).
When using the transmitter of this flowmeter in a redundant configuration, the use of a common cause factor
(β-factor) of 5% is suggested.
If the owner-operator of the plant would institute common cause failure training and more detailed maintenance
procedures for avoiding common cause failure, the β-factor of 2% would be applicable.
2.2.11 Lifetime Limits
The expected lifetime of this product is 10 years. The reliability data listed the FMEDA report is only valid for
this period. The failure rates of this product may increase sometime after this period. Reliability calculations
based on the data listed in the FMEDA report for its lifetimes beyond 10 years may yield results that are too
optimistic. Product use can continue at the user's responsibility, but the calculated SIL may not be achieved.
2.2.12 Environmental Limits
The environmental limits on this product are specified in the general specifications as listed in Table 1.1.
2.2.13 Application Limits
The application limits on this product are specified in this manual. If it is used outside of the application limits,
the reliability data listed in Subsection 2.2.10 becomes invalid.