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Emerson Process Management Rev AA manual

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Table of contents for the manual

  • Page 1

    Functional Safety Manual M310/FSM , Rev AA January 2012 Horizontal Float Switch www .mobrey .com Mobrey Magnetic Level Switches Functional Safety Manual[...]

  • Page 2

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  • Page 3

    2 Functional Safety Manual M310/FSM, Rev AA January 2012 Horizontal Float Switch Content s Introduction Scope and Purpose of the Safety Manual .............. ................ ................. ............ page 3 Skill Level Requirement ........... ............................ .......................................... ...... page 3 T erms, Abbrevi[...]

  • Page 4

    3 Functional Safety Manual IP101/FSM, Rev AA January 2012 Horizontal Float Switch Magnetic Level Switch Functional Safety Manual INTRODUCTION Scope and Purpose of the Safety Manual This safety manual contains the information to desi gn, install, verify and maintain a Safety Instrumented Function (SIF) utiliz ing the Mobrey magne tic level switch. T[...]

  • Page 5

    4 Functional Safety Manual M310/FSM, Rev AA January 2012 Horizontal Float Switch FIT FIT is the abbreviation for Failure In Time. One FIT is 1x10 -9 failure per hour FMEDA Failure Modes, Effects, and Diagnostics Analysis. Functional Safe ty Part of the overall safety relating to the process and the BPCS whic h depends on the correct functi oning of[...]

  • Page 6

    5 Functional Safety Manual IP101/FSM, Rev AA January 2012 Horizontal Float Switch Document ation and St andards This section lists the documentation and st andards referred to by this safety manual. T able 1. Associated Documentation T able 2. Associated S tandards Documents Purpose of Documents IEC 61508-2: ed2, 2010 Functional Safety of Electrica[...]

  • Page 7

    6 Functional Safety Manual M310/FSM, Rev AA January 2012 Horizontal Float Switch PRODUCT DESCRIPTION Level Switch Purpose Mobrey magnetic level switches are ideal fo r high and low liquid level alarm, overfill alarm, and pump co ntrol duties. Figure 1. Application Example: High and Low Level Alarm Operation Principle The level switch is designed to[...]

  • Page 8

    7 Functional Safety Manual IP101/FSM, Rev AA January 2012 Horizontal Float Switch Figure 3. Level Increases – Float Pivots Upwards NOTE: For all product information and docume ntation downloads, visit www .mobrey .com. Ordering Information Level swit ch models fi tted with options lis ted on pages 14 and 15 of this manual have been externally ass[...]

  • Page 9

    8 Functional Safety Manual M310/FSM, Rev AA January 2012 Horizontal Float Switch DESIGNING A SAFETY FUNCTION USING THE LEVEL SWITCH Safety Function A change in liquid level through the operating ran ge of the float causes the switch to operate. It may be used in high level or low level safety related appl ications. In either case, it is recommended[...]

  • Page 10

    9 Functional Safety Manual IP101/FSM, Rev AA January 2012 Horizontal Float Switch SIL Cap ability Systematic Integrity The Mobrey level switch has met manufacturer design process requi rements of Safety Integrity Level 2 (SIL 2). These ar e intended to achieve sufficient integrity against systematic errors of design by the manufacturer . A Safety I[...]

  • Page 11

    10 Functional Safety Manual M310/FSM, Rev AA January 2012 Horizontal Float Switch Connection of the Level Switch to the SIS Log ic Solver The Mobrey level switch should be connect ed to th e safety-rated logic solver which is actively performing the safety function as well as automatic diagn ostics (if any) designed to diagnose potentially dangerou[...]

  • Page 12

    11 Functional Safety Manual IP101/FSM, Rev AA January 2012 Horizontal Float Switch OPERATION AND MAINTENANCE Proof-test Requirement During operation, a low-de mand mode SIF mu st be proo f-tested. The objec tive of proof-testing is to detect failures within t he equipment in the SIF that are not dete cted by any automatic diagnostics of the system.[...]

  • Page 13

    12 Functional Safety Manual M310/FSM, Rev AA January 2012 Horizontal Float Switch SPECIFICATIONS Useful Life USEFUL LIFETIME According to Section 7.4.9.5 of IEC 61508-2, a useful lifetime based on experience should be assumed. Although a constant failure rate is assum ed by the probabilistic estimation method (see FMEDA report), this only applie s [...]

  • Page 14

    13 Functional Safety Manual IP101/FSM, Rev AA January 2012 Horizontal Float Switch PROPOSED PROOF-TEST PROCEDURE According to Section 7.4.3.2.2 (f) of th e standard IEC 6 1508-2, proof-tests shall be undertaken to reveal dangerous faults which are undetected by diagnostic tests. This means that it is necessary to specify how dangerous undetected fa[...]

  • Page 15

    14 Functional Safety Manual M310/FSM, Rev AA January 2012 Horizontal Float Switch LEVEL SWITCHES CERTIFIED TO IEC 61508 T ables 9, 10, and 1 1 lists all of the Mobr ey magnetic level switch options that are certified to IEC 61508. In general, this is the entire range with the e xception of the marine versions, pneumatic switch mechanisms, and some [...]

  • Page 16

    15 Functional Safety Manual IP101/FSM, Rev AA January 2012 Horizontal Float Switch T able 10. Level Switches fo r General Pur pose Applications (Aluminum Bronze Wetside) T able 1 1. Level Switches for Hazardous Area Application s Model Product Description S Switch Flange (Head) 01 Mobrey A flange Switch Mechanism DB Electrical: 2 independent Single[...]

  • Page 17

    M310/FSM Rev AA 01/12 Functional Safety Manual M310/FSM, Rev AA January 2012 Horizontal Float Switch © 2012 Mobrey Ltd. All rights reserved. International: Emerson Pr ocess Management Mobrey Ltd. 158 Edinburgh Avenue Slough, Berks , SL1 4UE , UK T +44 (0)1753 756600 F +44 (0)1753 823589 www .mobrey .com Americas: Emerson Process Management Rosemou[...]