6.1.4 Proof Test Procedure
A suggested proof test is described below. This test will
detect approximately 85% of possible DU failures in
Model R96-511*-*** of the PULSAR Model R96 Pulse
Burst Radar Level Transmitter.
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. Reduce the level in the vessel. The Status parameter should
say “OK” and the level reading should be equal to the value
in the “Bottom Blocking Distance” parameter.
5. Perform a two-point calibration check of the transmitter by
applying level at two points and compare the transmitter
display reading and the current level value to a known refer-
ence 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 antenna
from the process. Inspect the antenna for buildup or clog-
ging. Clean the antenna if necessary.
Perform a bench verification by aiming the antenna at two
different distances from a target (such as a wall). First, set
the device to measure Distance. Then compare the trans-
mitter display and loop current readings to the actual dis-
tances.
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.
Return the transmitter to level mode. Proceed to step 10.
10. Re-install the transmitter and antenna.
11. Restore the loop to full operation.
12. Remove the bypass from the safety PLC or otherwise restore
normal operation.
10
58-650 Pulsar
®
Model R96 SIL Functional Safety Manual
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