KROHNE H250 M9 Safet V1 EN - Manual (Page 3)

INTRODUCTION
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H250
www.krohne.com 02/2012 - 4000656701 MA H250-M9 SIL R02
Introduction
1.1 Fields of application
Measurements of volume flow rate of liquids, gases and vapor that shall meet the special safety
requirements according to IEC 61508.
The measuring unit meets the requirements regarding
• Functional safety in accordance with IEC 61508-2:2000
• EMC in accordance to EN 60947-5-2, EN 60947-5-6
and NAMUR recommendation NE 21
• ATEX compliance in accordance to EN 1127-1, EN 13463-1, EN 50014, EN 50020, EN 50021
and EN 50281-1-1
• PED in accordance to EN 13445-2 and EN 729-2
For further information please refer to the CE declaration of conformity which is available at the
Download Center at www.krohne.com.
1.2 User benefits
Use for
• Volume flow monitoring up to SIL 2 (see Exida FMEDA report Krohne 05/06-20 R007)
• Continuous measurement
• Easy commissioning
1.3 Relevant standards / literature
[N1] IEC 61508-2:2000 Functional Safety of Electrical/Electronic/Programmable Electronic
Safety-Related Systems
[N2] ISBN: 0471133019 John Wiley & Sons Electronic Components: Selection and Application
Guidelines by Victor Meeldijk
[N3] FMD-91, RAC 1991 Failure Mode / Mechanism Distributions
[N4] FMD-97, RAC 1997 Failure Mode / Mechanism Distributions
[N5] NPRD-95, RAC Non-electronic Parts - Reliability Data 1995
[N6] SN 29500 Failure rates of components
[N7] NSWC-98/LE1 Handbook of Reliability Prediction Procedures for Mechanical Equipment
[N8] IEC 60654-1:1993-02, second edition, Industrial-process measurement and control
equipment - operating conditions - Part 1: Climatic condition
MA_H250_M9_SIL2_R02_en_656701_PRT.book Page 3 Thursday, March 1, 2012 10:26 AM