96
Reference Manual
00809-0100-4107, Rev BA
Section 7: Safety Instrumented Systems Requirements
April 2013
Safety Instrumented Systems Requirements
Required tools: Field Communicator and pressure calibration equipment.
1.
Bypass the safety function and take appropriate action to avoid a false trip.
2.
Use HART communications to retrieve any diagnostics and take appropriate action.
3.
Send a HART command to the transmitter to go to the high alarm current output and
verify that the analog current reaches that value
. See
4.
Send a HART command to the transmitter to go to the low alarm current output and
verify that the analog current reaches that value
(1)
.
5.
Perform a two-point calibration of the sensor (see section 5.5 Trim the pressure signal)
over the full working range and verify the current output at each point.
6.
Remove the bypass and otherwise restore the normal operation.
7.
Place the Security switch in the (
) position.
Note
The user determines the proof test requirements for impulse piping.
Automatic diagnostics are defined for the corrected % DU: The tests performed
internally by the device during runtime without requiring enabling or programming by
the user.
Calculation of average probability of failure on demand
(PFD
AVG
)
PFD
AVG
calculation can be found in the FMEDA report located at:
www.rosemount.com/safety
.
7.1.5
Inspection
Visual inspection
Not required
Special tools
Not required
Product repair
The Rosemount 2051 is repairable by major component replacement.
All product repair and part replacement should be performed by qualified personnel.
(1)
This tests for compliance voltage problems such as a low loop power supply voltage or increased wiring distance. This also
tests for other possible failures.
.
.
