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Table A1.2.2 Proof Testing
The suggested proof test will detect 78 % of dangerous hidden failures in the AXR.
Step
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.
Send a HART command to the flowmeter to go to the high alarm current output and verify that the analog
current reaches that value.
4.
Send a HART command to the flowmeter to go to the low alarm current output and verify that theanalog
current reaches that value.
5.
Perform a two-point calibration of the flowmeter over the full working range.
6.
Check current output when there is no flow in the meter.
7.
Check current output when there is a typical flow in the meter.
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.
Website address: http://www.yokogawa.com/fld/
A1.2.6 Repair and Replacement
If repair is to be performed with the process online
the AXR will need to be bypassed during the
repair. The user should setup appropriate bypass
procedures.
In the unlikely event that the AXR has a failure, the
failures that are detected should be reported to
Yokogawa.
When replacing the AXR, the procedure in the
installation manual should be followed.
The personnel performing the repair or replacement
of the AXR should have a sufficient skill level.
<Appendix1. Safety Instrumented Systems Installation>
Action
A1.2.7 Startup Time
The AXR generates a valid signal within 10 second
of power-on startup.
A1.2.8 Firmware Update
In case firmware updates are required, they
will be performed at factory. The replacement
responsibilities are then in place. The user will not
be required to perform any firmware updates.
A1-2
IM 01E30D01-01EN
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