Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 39)

IM 01C50T01-01E A-2
APPENDIX A. SAFETY INSTRUMENTED SYSTEMS INSTALLATION
Table A.2.5 Proof Testing
Testing method Tools required
TA0102.EPS
Expected outcome Remarks
Analog Output Loop Test: Proof Test Coverage
=61% The output needs to
be monitored to assure
that the transmitter
communicates the
correct signal. Handheld terminal
Proof Test Coverage
=96% The output needs to be
monitored to assure
that the transmitter
communicates the
correct signal. Handheld terminal
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.
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.
A.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.
A.2.7 Startup Time
The YTA generates a valid signal within 5 seconds of
power-on startup.
A.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.