2 TTH200, TTR200, TTF200 TEMPERATURE TRANSMITTER | SM/TTX200/SIL-EN REV. E
Table of contents
1 Application area .......................................................................................... 3
2 Purpose ........................................................................................................ 3
3 Terms and definitions ............................................................................... 4
4 Associated documents ............................................................................. 5
5 Safety function .......................................................................................... 6
Alarm behavior and alarm current output ................................................................. 6
Overall safety accuracy .................................................................................................. 6
Diagnostic test interval ................................................................................................. 6
Type classification ......................................................................................................... 6
Useful Lifetime ................................................................................................................ 7
Systematic Capability .................................................................................................... 7
Safe Failure Fraction SFF .............................................................................................. 7
Average probability of dangerous failure on demand PFD
AVG
............................. 7
6 Constraints ................................................................................................. 8
7 Periodic proof test and maintenance ..................................................... 9
Proof Test ........................................................................................................................ 9
8 Installation, commissioning & configuration ....................................... 10
Activating / Deactivating write protection ............................................................. 10
Checks ............................................................................................................................ 10
9 Identification ............................................................................................ 11
10 Example PFD
AVG
Calculation .................................................................. 12
11 Failure modes, failure rates and diagnostics ........................................ 12
Failure Rates .................................................................................................................. 12
Assumptions ................................................................................................................. 13
Diagnostics .................................................................................................................... 13
12 Notes on Cyber security.......................................................................... 14
13 Release history ......................................................................................... 14
14 Appendix – Exida FMEDA Report ............................................................. 15
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