10
ORI-652 Jupiter
®
Model JM4 Magnetostrictive Transmitter – SIL Safety Manual
Step Action
5
Use the “DIAGNOSTICS” menu to observe the present Echo Curve and document typical per-
formance values. Confirm that the ECHO Waveform is normal. The ECHO curve is dependent
on the probe used and the level of the process on the probe. It is recommended that a typical
ECHO curve be saved at commissioning. Comparison of the ECHO curve at proof test to one
stored at the time of commissioning gives additional confidence of the normal operation of the
unit. Use of digital communications (HART enhanced DD or DTM) is necessary for comparison
of echo curves. For a dual float unit repeat the steps below for the second float and document
“Upr Echo Strength” and “Ifc Echo Strength” as well as “Upr Noise / Threshold” and “Ifc Noise /
Threshold”.
a.) Move the process level so the float is located at a distance of approximately 33% of probe
length from the connector end of the probe.
b.) Choose the menu “DIAGNOSTICS/ECHO CURVES/ View Echo Curve”.
i.) Observe the present Echo Curve, identify the characteristic portions of the waveform
related to the top of the probe and float location.
ii.) Confirm signal from the float appears normal and is located as expected.
iii.) Verify the baseline of the waveform is normal and does not have evidence of excessive
noise.
iv.) If possible, compare to Echo curve from commissioning to assure that performance has
not changed significantly.
c.) Choose the menu “DIAGNOSTICS/ADVANCED DIAGNOSTICS/ INTERNAL VALUES”.
i.) Observe and record:
Upper
Interface
1. Echo Strength __________ ___________
2. Lvl Noise / Threshold __________ ___________
ii.) Confirm that these values match the values observed at commissioning of the unit and/
or at previous Proof Tests.
1. Echo Strength change is less than ±15.
2. Lvl Noise / Threshold is less than ±15.
6
Perform a 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 know refer-
ence 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 moving the float to two points on the probe. Measure the level from the bottom of the probe
to the points and compare to the transmitter display and current level readings.
a.) If calibration is off by more than 1%, call the factory for assistance.
b.) If calibration is correct, the proof test is complete. Re-install the probe and transmitter and
proceed to step 9.
9
Restore the loop to full operation.
10
Remove the bypass from the safety PLC or otherwise restore normal operation.
