6.1.4 Proof Test Procedure
A suggested proof test is described below. This test will
detect approximately 97% of possible DU failures in
Model 705-510*-*** of the ECLIPSE Enhanced Model 705
Guided Wave Radar Level Transmitter. The test will detect
approximately 94% of possible DU failures in Model
705-51A*-*** of the ECLIPSE Enhanced Model 705.
1. Bypass the safety PLC or take other appropriate action to
avoid a false trip.
2. Send a HART command to the transmitter to go to the
high alarm current output and verify that the analog current
reaches that value.
This tests for compliance voltage problems such as low
power supply voltage or increased loop wiring resistance.
This also tests for other possible failures in the current
loop circuitry.
3. Send a HART command to the transmitter to go to the low
alarm current output and verify that the analog current
reaches that value.
This tests for possible quiescent current related failures.
4. Remove level from the probe. The Status parameter should
say “Dry Probe” and the level reading should be equal to
the value in the “Level Offset” parameter.
5. 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
known reference measurement.
6. If the calibration is correct, the proof test is complete.
Proceed to step 11.
7. If 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 points and compare to the transmitter display and
current level readings.
8. If the calibration is off by more than 2%, call the factory for
assistance.
9. If the calibration is correct, the proof test is complete.
Proceed to step 10.
10. Re-install the probe and transmitter.
11. Restore the loop to full operation.
12. Remove the bypass from the safety PLC or otherwise restore
normal operation.
10
57-650 Eclipse
®
SIL Functional Safety Manual
