Configuration; Operationandmaintenance - Emerson Rosemount 248 Reference Manual

Safety Instrumented Systems (SIS) Requirements
May 2019
5.4

Configuration

Use any HART Protocol capable configuration tool to communicate with and verify the
initial configuration or any configuration changes made to the transmitter prior to
operating in Safety Mode. All configuration methods outlined in Section 3.2:
Commisioning
Software or hardware lock must be used in order to prevent unwanted changes to the
transmitter configuration.
Note
Transmitter output is not safety-rated during the following: Configuration changes,
Multidrop operation, Simulation, Active Calibrator mode, and loop tests. Alternative
means should be used to ensure process safety during transmitter configuration and
maintenance activities.
5.5

OperationandMaintenance

5.5.1 Proof test
The following proof tests are recommended. In the event that an error is found in the
safety functionality, proof test results and corrective actions taken must be documented
at Emerson.com.
All proof test procedures must be carried out by qualified personnel.
5.5.2 Partial proof test 1
The partial proof test 1 consists of a power cycle plus reasonability checks of the
transmitter output. Reference the FMEDA Report for percent of possible DU failures in the
device.
FMEDA report can be found at
Required tools: Field Communicator, mA meter
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 high alarm current output and
3. Send a HART command to the transmitter to go to the low alarm current output
4. Use the HART communicator to view detailed device status to ensure no alarms or
5. Perform reasonability check on the sensor value(s) versus an independent estimate
56
are the same for the safety certified transmitter with any differences noted.
Rosemount 248 Temperature Transmitter
verify that the analog current reaches that value. This tests for compliance voltage
problems such as low loop power supply voltage or increased wiring resistance. This
also tests for other possible failures.
and verify that the analog current reaches that value. This tests for possible
quiescent current related failures.
warnings are present in the transmitter.
(i.e. from direct monitoring of BPCS value) to show current reading is good.
Rosemount 248 Temperature Transmitter Reference Manual
Reference Manual
00809-0100-4825
Product Page.