Reference Manual
00809-0600-4026, Rev BA
December 2011
Rosemount Process Radar
2-20
Operation and
Maintenance
The Rosemount 5300 Series Prior-Use option must be tested at regular
intervals to confirm that the overfill and empty tank protection function result in
the desired system response. The following proof test is recommended. If an
error is found in the safety functionality, the measuring system must be
switched out of service and the process held in a safe state by means of other
measures.
Proof test results and corrective actions taken must be documented at
www.emersonprocess.com/rosemount/safety.
The required proof test intervals depend on the transmitter configuration and
process environment. Refer to the reference manual and the Failure Modes,
Effects, and Diagnostic Analysis (FMEDA) report for further information.
Proof test
This test detects approximately 95% of the possible Dangerous Undetected
(DU) failures of the transmitter including the sensor element, not detected by
the transmitter’s automatic diagnostics. See the Rosemount 5300 Reference
Manual (Document No. 00809-0100-4530) for additional details and
instructions. Prior to this test, the echo curve should be inspected to ensure
no disturbing echoes affecting the measurement performance are present in
the tank.
Required tools: Field Communicator and mA meter.
1. Bypass the safety logic solver or take other appropriate actions to avoid
false trip.
2. Disable write protection if the function is enabled.
3. Using Loop Test, enter the mA value representing a high alarm current
output. Verify that the analog current reaches that value using the
reference meter.
This tests for compliance voltage problems, such as a low loop power
supply voltage or increased wiring resistance.
4. Using Loop Test, enter the mA value representing a low alarm current
output. Verify that the analog current reaches that value using the
reference meter.
This tests for possible quiescent current related failures.
5. Perform a two-point calibration check of the transmitter by applying level
to two points on the probe within the measuring range
(1)
. Verify that the
current output corresponds to the level input values using a known
reference measurement.
This step verifies that the analog output is correct in the operating range
and that the Primary variable is properly configured.
6. Enable write protection.
7. Restore the loop to full operation.
8. Remove the bypass from the safety logic solver or otherwise restore
normal operation.
9. Document the test result for future reference.
Inspection Visual Inspection
It is recommended to inspect the probe for possible build up or clogging.
(1) For best performance, use the 4 - 20 mA range points as calibration points.
(78 pages)
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