Note
This tests for faults in the input multiplexer and A to D converter.
6. Remove the bypass and otherwise restore the normal operation.
7. Place the Security switch in the ( ) position.
6.5.3 Comprehensive proof test
The comprehensive proof test consists of performing the same steps as the simple
suggested proof test but with a two-point calibration of the pressure and temperature
sensors in place of the reasonability check of the sensors. This test will detect
~
90% of
possible DU failures in the device.
About this task
Required tools: Field Communicator and pressure calibration equipment.
Procedure
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 Alarm level verification.
Note
This tests for compliance voltage problems such as a low loop power supply voltage
or increased wiring resistance. This also tests for other possible failures.
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.
Note
This tests for possible quiescent current related failures.
5. Perform a two-point verification of the transmitter pressure over the full working
range (and process temperature where applicable).
Note
If the two-point process temperature verification is performed with electrical
instrumentation, this proof test will not detect any failures of the sensor.
6. Remove the bypass and otherwise restore the normal operation.
7. Place the Security switch in the ( ) position.
Example
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.
Safety Instrumented Systems Requirements Reference Manual
October 2018 00809-0100-4803
146 Rosemount 3051S Multivariable Transmitter
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