Ashcroft A Series - N4 Pressure Switch User Manual download pdf (Page 9)

A-SERIES SWITCH SAFETY MANUAL

I&M009-10210

REV A - 4/19/2013

6 START-UP CHECKLIST

The following checklist may be used as a guide to employ the A-Series pressure

switch in a safety critical SIF compliant to IEC61508.

Activity

Result

Verified

Date

Design

Target Safety Integrity Level and PFDavg

determined

Correct valve mode chosen (Fail-closed, Fail-

open)

Design decision documented

Pneumatic compatibility and suitability verified

SIS logic solver requirements for valve tests

defined and documented

Routing of pneumatic connections determined

SIS logic solver requirements for partial stroke

tests defined and documented

Design formally reviewed and suitability

formally assessed

Implementation

Physical location appropriate

Pneumatic connections appropriate and

according to applicable codes

SIS logic solver valve actuation test

implemented

Maintenance instructions for proof test released

Verification and test plan released

Implementation formally reviewed and

suitability formally assessed

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Ashcroft A Series - N4 Pressure Switch User Manual Page 9