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

A-S ERIES S WITCH S AFETY M ANUAL
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
By 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