Yokogawa ADMAG AXR Uživatelský manuál stáhnout pdf (Strana 186)

<Appendix1. Safety Instrumented Systems Installation>

A1-1

IM 01E30D01-01EN

Appendix 1. Safety Instrumented Systems

Installation

WARNING

The contents of this appendix are cited from

exida.comsafetymanualontheAXRseries

owmeterspecicallyobservedforthesafety

owmeterpurpose.WhenusingtheAXRfor

Safety Instrumented Systems (SIS) application,

the instructions and procedures in this section

must be strictly followed in order to preserve the

owmeterforthatsafetylevel.

A1.1 Scope and Purpose

This section provides an overview of the user

responsibilities for installation and operation of the

AXRinordertomaintainthedesignedsafetylevel

for Safety Instrumented Systems (SIS) applications.

Items that will be addressed are proof testing, repair

and replacement of the transmitter, reliability data,

lifetime, environmental and application limits, and

parameter settings.

A1.2 Using the AXR for an SIS

Application

A1.2.1 Safety Accuracy

TheAXRhasaspeciedsafetyaccuracyof2%.

This means that the internal component failures are

listed in the device failure rate if they will cause an

error of 2% or greater.

A1.2.2 Diagnostic Response Time

TheAXRwillreportaninternalfailurewithin8

seconds of the fault occurrence.

A1.2.3 Setup

Duringinstallationtheowmetermustbesetup

with engineering units parameters. This is typically

done with a handheld terminal. These parameters

mustbeveriedduringtheinstallationtoinsure

thatthecorrectparametersareintheowmeter.

Engineeringrangeparameterscanbeveriedby

reading these parameters from the optional local

display or by checking actual calibration of the

owmeter.

Thecalibrationoftheowmetermustbeperformed

after parameters are set.

A1.2.4 Required Parameter Settings

The following parameters need to be set in order to

maintain the designed safety integrity.

Table A1.1 Required Parameter Settings

Item Description

Burnout direction

switch

To specify if the output should go

21.6 mA or higher or 3.2 mA or lower

upon detection of an internal failure.

Write protection

switch

The write function should be

disabled.

A1.2.5 Proof Testing

The objective of proof testing is to detect failures

withintheowmeterthatarenotdetectedbythe

diagnosticsoftheowmeter.Ofmainconcern

are undetected failures that prevent the safety

instrumented function from performing its intended

function. See table A1.2 for proof testing method.

The frequency of the proof tests (or the proof

test interval) is to be determined in the reliability

calculations for the safety instrumented functions

orwhichtheAXRisapplied.Theactualprooftests

must be performed more frequently or as frequently

asspeciedinthecalculationinordertomaintain

required safety integrity of the safety instrumented

function.

Thefollowingtestsneedtobespecicallyexecuted

when a proof test is performed. The results of

the proof test need to be documented and this

documentation should be part of a plant safety

management system. Failures that are detected

should be reported to Yokogawa.

The personnel performing the proof test of the



owmetershouldbetrainedinSISoperations

includingbypassprocedures,AXRowmeter

maintenance, and company management of

change procedures.

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