Emerson Rosemount 8782 Reference Manual page 99

Reference Manual
00809-0100-8782
9.10.2 Establishing the sensor baseline
The first step in running the Smart Meter Verification test is establishing the reference
baseline that the test will use as the baseline for comparison. This is accomplished by
having the transmitter take a baseline of the sensor.
Reset baseline (re-signature meter)
LOI menu path
Having the transmitter take an initial sensor baseline when first installed will provide the
comparison point for the verification tests that are done in the future. The sensor baseline
should be taken during the start-up process when the transmitter is first connected to the
sensor, with a full line, and ideally with no flow in the line. Running the sensor baseline
procedure when there is flow in the line is permissible, but this may introduce some noise
into the electrode circuit resistance measurement. If an empty pipe condition exists, then
the sensor baseline should only be run for the coils.
Note
For high temperature applications, it is a best practice to take the sensor baseline when
the process fluid and sensor have reached their normal operating temperature if that will
be operating condition during test measurements.
Once the sensor baseline process is complete, the measurements taken during this
procedure are stored in non-volatile memory to prevent loss in the event of a power
interruption to the meter. This initial sensor signature is required for both manual and
continuous Smart Meter Verification.
Recall values (recall last saved)
LOI menu path
In the event that the sensor baseline was reset accidentally or incorrectly, this function will
restore the previously saved sensor baseline values.
9.10.3 Smart Meter Verification test criteria
The Smart Meter Verification diagnostic provides the ability to customize the test criteria
to which the verification must be tested. The test criteria can be set for each of the flow
conditions discussed above.
No flow limit
LOI menu path
Set the test criteria for the no flow condition. The factory default for this value is set to five
percent with limits configurable between one and ten percent. This parameter applies to
manually initiated test only.
Reference Manual
Advanced Diagnostics Configuration
Diagnostics → Advanced Diag → Meter Verif → Sensr Baseline
→ Reset Baseline
Diagnostics → Advanced Diag → Meter Verif → Sensr Baseline
→ Recall Values
Diagnostics → Advanced Diag → Meter Verif → Test Criteria →
No Flow
November 2019
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