88
Reference Manual
00809-0200-4728, Rev RA
Section 7: Safety Instrumented Systems (SIS) Certification
April 2015
Safety Instrumented Systems (SIS) Certification
1.
Bypass the safety PLC or take other appropriate action to avoid a false trip.
2.
Execute steps 2 through 6 of the Partial proof test (see 7.7.2).
3.
Disconnect Sensor 1 and connect a calibrated sensor simulator in its place.
4.
Using at least 2 simulated temperature points, verify the transmitter output remains
within the required accuracy.
5.
If sensor 2 is used, repeat steps 3 and 4.
6.
Restore sensor connections to the transmitter.
7.
Verify the housing temperature value is reasonable.
8.
Check that sensor value(s) are reasonable in comparison to an independent
measurement, such as basic process control system (BPCS) value.
9.
Restore the loop to full operation. Remove the bypass from the safety PLC or otherwise
restore normal operations.
10.
Document the test results per the plant’s requirements.
Visual inspection
Not required
Special tools
Not required
Product repair
The 644 is repairable by replacement only.
7.8
Specifications
The 644 must be operated in accordance to the functional and performance specifications
provided in the Rosemount 644 Product Data Sheet (document number 00813-0100-4728).
7.8.1
Failure rate data
The FMEDA report includes failure rates and common cause Beta factor estimates.
Summary of Contents for Rosemount 644
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