10
57-656 SIL Safety Manual for ECLIPSE Model 706
Step
Action
5
Use the DIAGNOSTICS menu to observe the present Echo Curve. Confirm that the ECHO Waveform is
normal. The echo curve is dependent on the type of probe, the installation conditions and the level of
process on the probe. Comparison of the present Echo Curve to the one stored at the time of commis-
sioning the unit gives additional confidence of the normal operation of the unit. Use of the DTM and
digital communications is necessary for comparison of echo curves.
a.) Select DIAGNOSTICS/ ECHO CURVE/ View Echo Curve
i.) Observe the present Echo Curve, identify the characteristic portions of the waveform related
to the FIDUCIAL, Process level, End of Probe and other features.
ii.) Confirm that the FIDUCIAL appears acceptable. Confirm the FIDUCIAL is located where
expected.
iii.) Confirm that the signal from the process level appears normal and is located as expected.
iv.) Verify that the baseline of the waveform is smooth and flat.
v.) Compare to Echo Curve from commissioning in the FIDUCIAL area.
b.) Access the Fiducial Ticks and Fiducial Strength values in the menu: DIAGNOSTICS /
ADVANCES DIAGNOSTICS / INTERNAL VALUES
i.) Observe and record:
1.) Fiducial Ticks _____________
2.) Fiducial Strength _____________
ii.) Confirm that these values match the previous values.
1.) Fiducial Ticks differs within ±100
2.) Fiducial Strength differs within ±15
6
Perform two-point calibration check of the transmitter by applying level to two points on the probe and
compare the transmitter display reading and the current level value to a known reference measurement.
7
If the calibration is correct the proof test is complete. Proceed to step 9.
8
If the calibration is incorrect, remove the transmitter and probe from the process. Inspect the probe for
buildup or clogging. Clean the probe, if necessary. Perform a bench calibration check by shorting the
probe at two points. Measure the level from the bottom of the probe to the two points and compare to
the transmitter display and current level readings.
a.) If the calibration is off by more than 2%, contact the factory for assistance.
b.) If the calibration is correct, the proof test in complete.
c.) Re-install the probe and transmitter.
9
Restore loop to full operation.
10
Remove the bypass from the safety PLC to restore normal operation.
