Level Deviation Monitoring; Product Repair; Specifications - Emerson Rosemount 5408 Reference Manual

Reference Manual
00809-0100-4408, Rev BA
8.8.5

Level deviation monitoring

Use the analog output to obtain level (or distance) reading and compare with an independent level
measurement. Verify that the deviation is within the pass limit.
1. Obtain the level (or distance) measurement value derived from the analog output (e.g. by checking
measurement value in safety logic solver).
2. Obtain the level (or distance) measurement value from an independent level measurement (e.g. the
BPCS level sensor).
3. Compare the measurements and verify that the deviation is within the safety deviation of 2%.
8.8.6

Product repair

The Rosemount 5408:SIS is repairable by major component replacement. All failures detected by the
transmitter diagnostics or by the proof-test must be reported. Feedback can be submitted electronically
at EmersonProcess.com/Rosemount-safety
8.9

Specifications

The Rosemount 5408:SIS must be operated according to the functional and performance specifications
provided in
Failure rate data
The FMEDA report
analysis.
Safety deviation
±2.0% of analog output span
Transmitter response time
< 6 s at damping value 2 s (default)
< 2 s at damping value 0 s (minimum)
Diagnostic test interval
< 90 min
Turn-on time
< 40 s
1. Step response time as per IEC 61298-2.
2. The transmitter response time will be a function of the configured Damping value. Rosemount Radar Master Plus has a built-in function to calculate the
transmitter's measurement response time (select Configure > Device Setup > HART > Calculate Response Time). Note that this feature is only available for
transmitters ordered with option code EF2.
3. Assumes valid measurement. For upset conditions such as turbulence or excessive foaming, refer to
4. A majority of the self-diagnostic tests is performed once every second and an action (if necessary) is taken in less than 30 seconds (default).
5. Time from when power is applied to the transmitter until performance is within specifications.
Safety Instrumented Systems (4-20 mA only)
Appendix A: Specifications and Reference
includes failure rate data, assessment details, and assumptions regarding failure rate
(1)(2)(3)
(4)
(5)
Safety Instrumented Systems (4-20 mA only)
(Contact Us).
Data.
"Measurement recovery" on page
November 2017
203.
133