<Appendix1. Safety Instrumented Systems Installation
> A1-2
IM 01E30D01-01EN
Table A1.2.2 Proof Testing
Thesuggestedprooftestwilldetect78%ofdangeroushiddenfailuresintheAXR.
Step Action
1. Bypass the safety function and take appropriate action to avoid a false trip.
2. Use HART communications to retrieve any diagnostics and take appropriate action.
3. SendaHARTcommandtotheowmetertogotothehighalarmcurrentoutputandverifythattheanalog
current reaches that value.
4. SendaHARTcommandtotheowmetertogotothelowalarmcurrentoutputandverifythattheanalog
current reaches that value.
5. Performatwo-pointcalibrationoftheowmeteroverthefullworkingrange.
6. Checkcurrentoutputwhenthereisnoowinthemeter.
7. Checkcurrentoutputwhenthereisatypicalowinthemeter.
8. Remove the bypass and otherwise restore normal operation.
For details, refer to the FMEDA No. YOK 10/06-091 R001 V2R3.
The manuals can be downloaded from the website of Yokogawa or purchased from the Yokogawa
representatives.
Websiteaddress:http://www.yokogawa.com/d/
A1.2.6 Repair and Replacement
If repair is to be performed with the process online
theAXRwillneedtobebypassedduringthe
repair. The user should setup appropriate bypass
procedures.
IntheunlikelyeventthattheAXRhasafailure,the
failures that are detected should be reported to
Yokogawa.
WhenreplacingtheAXR,theprocedureinthe
installation manual should be followed.
The personnel performing the repair or replacement
oftheAXRshouldhaveasufcientskilllevel.
A1.2.7 Startup Time
TheAXRgeneratesavalidsignalwithin10second
of power-on startup.
A1.2.8 Firmware Update
Incasermwareupdatesarerequired,they
will be performed at factory. The replacement
responsibilities are then in place. The user will not
berequiredtoperformanyrmwareupdates.
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