Emerson Rosemount 644 Reference Manual page 110

Safety Instrumented Systems (SIS) Certification
March 2021
7.5.3 Comprehensive proof test 2
The comprehensive proof test 2 consists of performing the same steps as the partial proof
test but with a two-point calibration of the temperature sensor in place of the
reasonability check. Reference the FMEDA report for percent of possible DU failures in the
device.
Required tools: Field Communicator, temperature calibration equipment
Procedure
1. Bypass the safety PLC or take other appropriate action to avoid a false trip.
2. Perform partial proof test 1.
3. Verify the measurement for two temperature points for Sensor 1. Verify the
4. Perform reasonability check of the housing temperature.
5. Restore the loop to full operation.
6. Remove the bypass from the safety PLC or otherwise restore to normal operation.
7.5.4 Comprehensive proof test 3
The comprehensive proof test 3 includes a comprehensive proof test along with a simple
sensor proof test. Reference the FMEDA report for percent of possible DU failures in the
device.
Procedure
1. Bypass the safety PLC or take other appropriate action to avoid a false trip.
2. Perform simple proof test 1.
3. Connect calibrated sensor simulator in place of sensor 1.
4. Verify safety accuracy of two temperature points inputs to transmitter.
5. If sensor 2 is used, repeat
6. Restore sensor connections to transmitter.
7. Perform reasonability check of transmitter housing temperature.
8. Perform reasonability check on the sensor(s) values versus an independent estimate
9. Restore loop to full operation.
10. Remove the bypass from the safety PLC or otherwise restore to normal operation.
7.5.5 Inspection
Visual inspection
Special tools
Product repair
All failures detected by the transmitter diagnostics or by the proof-test must be reported.
Feedback can be submitted electronically at Emerson.com/Rosemount/Contact-Us.
110
measurement for two temperature points for Sensor 2, if second sensor is present.
(i.e. from direct monitoring of BPCS value) to show current reading is acceptable.
Not required.
Not required.
The Rosemount 644 is repairable by replacement only.
Step 3 and Step 4.
Reference Manual
00809-0200-4728
Emerson.com/Rosemount