Reference Manual
00809-0600-4026, Rev BA
December 2011
Rosemount Process Radar
5-18
For instructions on alarm level settings, see Section “Analog Output” in the
Rosemount 5400 Series Reference Manual (Document No.
00809-0100-4026).
NOTE
Only the High Alarm Mode can be used for the Safety Function. Do not
choose Freeze Current as an error will not be announced in the current loop.
Write Protection
A Rosemount 5400 Series transmitter can be protected from unintentional
configuration changes by a password protected function. It is recommended
to use write protection described in Section “Write Protecting a Transmitter” in
the Rosemount 5400 Series Reference Manual (Document No.
00809-0100-4026).
Site Acceptance
After the installation and configuration, proper operation of the transmitter
should be verified. A site acceptance test is therefore recommended. The
proof test outlined in this section can be used for this. Note that re-verification
of the transmitter operation is recommended if the configuration is changed.
Operation and
Maintenance
The Rosemount 5400 Series QS 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 process environment. Refer to the
reference manual and the Failure Modes, Effects, and Diagnostic Analysis
(FMEDA) report for further information.
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.
Proof test
This test detects approximately 95% of the possible Dangerous Undetected
(DU) failures of the transmitter. See the Rosemount 5400 Reference Manual
(Document No. 00809-0100-4026) for additional details and instructions. Note
that prior to conducting the test, the echo curve should be inspected to ensure
that no disturbing echoes affecting the measurement performance are
present in the tank.
Table 5-3. Alarm levels and operation values
Rosemount Alarm Level
Normal Operation
3.75 mA
(1)
(1) Transmitter Failure, hardware or software alarm in Low position.
4 mA 20 mA 21.75 mA
(2)
(2) Transmitter Failure, hardware or software alarm in High position.
3.9 mA
low saturation
20.8 mA
high saturation
(182 Seiten)
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