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Emerson Mobrey Series User Manual

Emerson Mobrey Series
26 pages
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Functional Safety Manual
M310/FSM, Rev BA
April 2017
Mobrey
Magnetic Level Switches
Functional Safety Manual
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Emerson Mobrey Series Specifications

General IconGeneral
ApplicationLiquid Level Detection
MountingTop, Side
Process ConnectionFlanged, Threaded
EnclosureIP66
OutputSPDT, DPDT
MaterialStainless Steel
ConnectionTerminal Block
ProtectionExplosion-proof Options Available

Summary

Product Description

Operation Principle

Explains the switch's mechanism, where liquid level changes cause contacts to open or close, facilitating safety functions.

Designing a Safety Function Using the Level Switch

Safety Function

Describes how the level switch is used in safety applications, recommending specific contact configurations for fail-safe operation.

SIL Capability

Covers the Safety Integrity Level (SIL) capabilities of the Mobrey level switch, including systematic and random integrity.

Systematic Integrity

Confirms the switch meets SIL 2 requirements for systematic integrity based on manufacturer design processes.

Random Integrity

States the device is Type A and its random capability has been assessed to SIL 2 according to IEC 61508-2.

Safety Parameters

Presents failure rate data valid for the product's useful lifetime and directs users to the FMEDA report for detailed analysis.

Installation and Commissioning

Operation and Maintenance

Proof-test Requirement

Explains the critical need for periodic proof-testing of SIFs to detect undetected failures and maintain safety integrity.

Proposed Proof-test Procedure

Suggested Proof-test

Provides step-by-step instructions for performing in-situ proof-tests to detect dangerous faults in the level switch.

Level Switches Certified to IEC 61508

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