Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 39)

IM 01C50T03-01E C-2
APPENDIX C. SAFETY INSTRUMENTED SYSTEMS INSTALLATION
Table C.2.5 Proof Testing
TA0102.EPS
Testing method Tools required Expected outcome Remarks
Analog Output Loop Test:
1. Bypass the safety PLC or take other
appropriate action to avoid a false
trip.
2. Send a HART or BRAIN command
to the transmitter to go to the high
alarm current output and verify that
the analog current reaches that
value.
3. Send a HART or BRAIN command
to the transmitter to go to the low
alarm current output and verify that
the analog current reaches that
value.
4. Use the HART or BRAIN
communicator to view detailed
device status to ensure no alarms
or warnings are present in the
transmitter.
5. Perform reasonability check on the
sensor value(s) versus an
independent estimate (i.e. from
direct monitoring of BPCS value) to
show current reading is good.
6. Restore the loop to full operation.
7. Remove the bypass from the safety
PLC or otherwise restore normal
operation.
• Handheld terminal Proof Test Coverage
=61% The output needs to be
monitored to assure that
the transmitter
communicates the
correct signal.
Analog Output Loop Test and
Temperature Spot Check:
1. Bypass the safety PLC or take other
appropriate action to avoid a false
trip.
2. Perform Analog Output Loop Test.
3. Verify the measurement for two
temperature points.
4. Perform reasonability check of the
housing temperature.
5. Restore the loop to full operation.
6. Remove the bypass from the safety
PLC or otherwise restore normal
operation.
• Handheld terminal Proof Test Coverage
=96% The output needs to be
monitored to assure that
the transmitter
communicates the
correct signal.
C.2.6 Repair and Replacement
If repair is to be performed with the process online, the
YTA will need to be bypassed during the repair. The
user should setup appropriate bypass procedures.
In the unlikely event that the YTA has a failure, the
failures that are detected should be reported to
Yokogawa.
When replacing the YTA, the procedure in the installa-
tion manual should be followed.
The personnel performing the repair or replacement of
the YTA should have a sufficient skill level.
C.2.7 Startup Time
The YTA generates a valid signal within 5 seconds of
power-on startup.
C.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.