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Siemens DS III PROFIsafe Series Product Information

Siemens DS III PROFIsafe Series Product Information

Pressure transmitter, functional safety
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SITRANS
Pressure transmitter
Functional safety for SITRANS P,
series DS III PROFIsafe
Product information
Supplement to the Operating Instructions
07/2006
A5E00849297-01
Introduction
General safety instructions
Device-specific safety
instructions
Appendix
List of
Abbreviations/Acronyms
1
2
3
A
B

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Summary of Contents for Siemens DS III PROFIsafe Series

  • Page 1 Introduction General safety instructions Device-specific safety instructions SITRANS Appendix Pressure transmitter Functional safety for SITRANS P, List of Abbreviations/Acronyms series DS III PROFIsafe Product information Supplement to the Operating Instructions 07/2006 A5E00849297-01...
  • Page 2 Trademarks All names identified by ® are registered trademarks of the Siemens AG. The remaining trademarks in this publication may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.

  • Page 3: Table Of Contents

    Table of contents Introduction............................. 1-1 Purpose of this document ......................1-1 Scope of this document ......................1-1 History ............................1-1 Further information........................1-2 General safety instructions ........................2-1 Safety-instrumented system ...................... 2-1 Safety Integrity Level (SIL)......................2-2 Device-specific safety instructions ......................3-1 Application range ........................

  • Page 4: Table Of Contents

    Table of contents Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...

  • Page 5: Introduction

    Introduction Purpose of this document This document contains information and safety notes that you will require when using the pressure transmitter in safety-instrumented systems. It is aimed at persons who install the device mechanically, connect it electrically, parameterize and commission it, as well as at service and maintenance engineers. Scope of this document This document deals with the pressure transmitters exclusively as a part of a safety function.

  • Page 6: Further Information

    The contents of these instructions shall not become part of or modify any prior or existing agreement, commitment or legal relationship. All obligations on the part of Siemens AG are contained in the respective sales contract which also contains the complete and solely applicable warranty conditions.

  • Page 7: General Safety Instructions

    General safety instructions Safety-instrumented system Definition: Safety-instrumented system A safety-instrumented system executes the safety functions that are required to achieve or maintain a safe status in a system. It consists of a sensor, logic unit/control system and final controlling element. Example: A safety-instrumented system is made up of a pressure transmitter, a limit signal sensor and a control valve.

  • Page 8: Safety Integrity Level (Sil)

    General safety instructions 2.2 Safety Integrity Level (SIL) Figure 2-1 Example of a safety-instrumented system with a bus Functioning of the system as shown in the example The transmitter generates a process-specific measured value. The programmable logic control (PLC) monitors this value in case it exceeds a preset limit value. If a fault occurs, the PLC generates a shutdown signal for the connected positioner.
  • Page 9 General safety instructions 2.2 Safety Integrity Level (SIL) The achievable SIL is determined by the following safety characteristics: • Average probability of dangerous failure of a safety function in case of demand (PFD • Hardware fault tolerance (HFT) • Safe failure fractions (SFF) Description The following table shows the dependency of the SIL on the "average probability of dangerous failures of a safety function of the entire safety-instrumented system"...
  • Page 10 General safety instructions 2.2 Safety Integrity Level (SIL) As per IEC 61511-1, Section 11.4.4, the hardware fault tolerance (HFT) can be reduced by one (values in brackets) for sensors and final controlling elements with complex components if the following conditions are applicable for the device: •...

  • Page 11: Device-Specific Safety Instructions

    Device-specific safety instructions Application range Overview The pressure transmitter is available in versions like gauge pressure, differential pressure and absolute pressure. The output signal is a process-specific digital measured value. The measured value is displayed with the associated status. The pressure transmitter measures corrosive, non-corrosive and hazardous gases, vapors and liquids.

  • Page 12: Safety Function

    Device-specific safety instructions 3.2 Safety function Level The gauge pressure or differential pressure version measures the level of corrosive, non- corrosive and hazardous liquids with the help of appropriate parameterization. Wetted parts are made from different materials depending on the required corrosion resistance.

  • Page 13: Settings

    Device-specific safety instructions 3.3 Settings Warning The binding settings and conditions are listed in the "Settings" and "Safety characteristics" sections. These conditions must be met in order to fulfill the safety function. The calculated Mean Time Between Failures (MTBF) for the SITRANS P pressure transmitter is approximately 282 years.

  • Page 14: Behavior In Case Of Faults

    When ordering replacement devices, please specify the serial number of the original device. The serial number can be found on the rating plate. The address of the responsible SIEMENS repair center, contacts, spare parts lists, etc. can be found on the Internet.

  • Page 15: Safety Characteristics

    Device-specific safety instructions 3.6 Safety characteristics Checking safety You should regularly check the safety function of the entire safety circuit in line with IEC 61508/61511. The testing intervals are determined during the calculation for each individual safety circuit in a system (PFD Electronics The safety function of the transmitter is ensured only with the electronics delivered by the factory.
  • Page 16 Device-specific safety instructions 3.6 Safety characteristics Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...

  • Page 17: Appendix

    Appendix Literature and standards Standard Description IEC 61508 Functional safety of following systems: Safety-instrumented Section 1-7 • Electrical • Electronic • Programmable • Target group: Manufacturers and suppliers of equipment IEC 61511 Functional safety - Safety systems for the process industry Section 1-3 Target group: Planners, constructors and users...

  • Page 18: Sil Declaration Of Conformity

    Appendix A.2 SIL Declaration of Conformity SIL Declaration of Conformity Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...
  • Page 19 Appendix A.2 SIL Declaration of Conformity Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...
  • Page 20 Appendix A.2 SIL Declaration of Conformity Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...

  • Page 21: Test Report (Excerpt

    Appendix A.3 Test report (excerpt) Test report (excerpt) Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...
  • Page 22 Appendix A.3 Test report (excerpt) Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...
  • Page 23 Appendix A.3 Test report (excerpt) Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...
  • Page 24 Appendix A.3 Test report (excerpt) Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...

  • Page 25: List Of Abbreviations/Acronyms

    List of Abbreviations/Acronyms Abbreviations Abbreviation Full term in English Meaning Hardware Fault Tolerance Hardware fault tolerance: Capability of a function unit to continue executing a required function in the presence of faults or deviations. MTBF Mean Time Between Failures Average period between two failures MTTR Mean Time To Repair Average period between the occurrence of a fault in a device or...
  • Page 26 List of Abbreviations/Acronyms B.1 Abbreviations Functional safety for SITRANS P, series DS III PROFIsafe Product information, 07/2006, A5E00849297-01...

  • Page 27: Glossary

    Glossary Dangerous failure Failure with the potential to bring the safety-instrumented system into a dangerous or non- functional status. Fail-safe The capability of a control to maintain the safe state of the controlled device, e.g. machine, process, or to bring the device to a safe state even when faults/failures occur. Failure/fault Failure A resource is no longer capable of executing a required function.
  • Page 28 Glossary Safety function Defined function executed by a safety-instrumented system with the objective of achieving or maintaining a safe system status taking into account a defined dangerous occurrence. Example: Limit pressure monitoring Safety Integrity Level → Safety-instrumented system A safety-instrumented system executes the safety functions that are required to achieve or maintain a safe status in a system.
  • Page 29 Safety required, 1-1 Checking, 3-5 Safety function, 2-1, 3-2 Checking, 3-3, 3-4 Sensor, 2-1 Settings, 3-3 Electronics, 3-5 Siemens Regional Office, 1-2 system Safety-instrumented, 2-1 Final controlling element, 2-1 Technical data, 3-3 History, 1-1 Write protection, 3-3 Maintenance, 3-4 Mean Time Between Failures, 3-3...

  • Page 30: Index

    Index Functional safety for SITRANS P, series DS III PROFIsafe Index-2 Product information, 07/2006, A5E00849297-01...

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Sitrans p series

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