Emerson Process Management 00809-0700-4530 Radar Detector User Manual


 
58
Reference Manual
00809-0700-4530, Rev AA
Section 4: Measurement validation
September 2013
Measurement validation
4.4 Operation and maintenance - proof testing for SIS
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
required proof test intervals are dependent on the configuration of the transmitter and the
process environment. The Rosemount 5300 Series is designed to have a 5-year proof test
interval assuming it represents the typical 35% of the SIF PFD
AVG
. However, it is the
responsibility of the operator/owner of the system to determine the sufficient time interval and
verify that it is followed. See the FMEDA
(1)
report for additional details or references.
If the overfill and empty tank protection function cannot be tested by a controlled filling to the
response height, a suitable simulation of the level or of the physical measuring effect must be
used to make the level sensor respond.
The simulation can be done in three different ways:
by short-circuiting the probe
by simulating the distance using the built-in simulation mode
by performing a loop test
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.
4.4.1 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. Instructions for performing the proof test with the Field Communicator, RRM, or
AMS, are available in the Appendix E: Performing Proof Test of the Rosemount 5300 Series
Reference Manual (Document No. 00809-0100-4530). Note that prior to this test, the echo
curve should be inspected to ensure that no disturbing echoes affecting the measurement
performance are present in the tank.
Required Tools: HART host/communicator and mA meter.
1. Bypass the 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 and
verify that the analog current reaches that value using the reference meter.
This step tests for compliance voltage problems, such as low loop power supply voltage or
increased wiring resistance.
4. Using Loop Test, enter the mA value representing a low alarm current output and verify
that the analog current reaches that value using the reference meter.
This step tests for possible quiescent current related failures.
(1) The FMEDA report is accessible at www.emersonprocess.com/rosemount/safety/PriorUse.htm.