KROHNE TT 51 SERIES EN - Manual (Page 2)

CONTENTS
2 www.krohne.com 09/2010 - 4000869801 - AD TT 51 SIL R01 en
TT 51 SERIES
1 Introduction 3
1.1 Field of application ........................................................................................................... 3
1.2 User benefits .................................................................................................................... 3
1.3 Manufacturer’s safety instructions.................................................................................. 3
1.4 Relevant standards / Literature....................................................................................... 4
2 Terms and definitions 5
3 Description of the subsystem 6
3.1 Functional principle.......................................................................................................... 6
4 Safety function 7
4.1 Description of the failure categories ............................................................................... 7
4.2 Specification of the safety function .................................................................................. 7
4.3 Redundancy ...................................................................................................................... 8
4.3.1 Sensor drift ............................................................................................................................. 8
4.3.2 Sensor backup ........................................................................................................................ 9
5 Project planning 10
5.1 Applicable device documentation .................................................................................. 10
5.2 Project planning, behaviour during operation and malfunction.................................... 10
5.2.1 SIL data ................................................................................................................................. 10
6 Periodic checks / Proof tests 11
6.1 Periodic checks .............................................................................................................. 11
6.2 Proof tests ...................................................................................................................... 11
7 Safety-related characteristics 13
7.1 Assumptions ................................................................................................................... 13
7.2 Specific safety-related characteristics .......................................................................... 14
8 Appendix 19
8.1 Declaration of conformity for Functional Safety (SIL) ................................................... 19
8.2 exida / FMEDA management summary ......................................................................... 20
8.3 Return / maintenance form............................................................................................ 23
.book Page 2 Thursday, September 9, 2010 4:19 PM