9.10 Smart Meter Verification
The Smart Meter Verification diagnostic provides a means of verifying the flowmeter is
within calibration without removing the sensor from the process. This diagnostic test
provides a review of the transmitter and sensor's critical parameters as a means to
document verification of calibration. The results of this diagnostic provide the deviation
amount from expected values and a pass/fail summary against user-defined criteria for the
application and conditions. The Smart Meter Verification diagnostic can be configured to
run continuously in the background during normal operation, or it can be manually
initiated as required by the application.
9.10.1 Sensor baseline parameters
The Smart Meter Verification diagnostic functions by taking a baseline sensor signature
and then comparing measurements taken during the verification test to these baseline
results.
The sensor signature describes the magnetic behavior of the sensor. Based on Faraday's
law, the induced voltage measured on the electrodes is proportional to the magnetic field
strength. Thus, any changes in the magnetic field will result in a calibration shift of the
sensor. Having the transmitter take an initial sensor signature when first installed will
provide the baseline for the verification tests that are done in the future. There are three
specific measurements that are stored in the transmitter's non-volatile memory that are
used when performing the calibration verification.
Coil circuit resistance
LOI menu path
Diagnostics → Advanced Diag → Meter Verif → Sensr Baseline
→ Values → Coil Resist
The coil resistance is a measurement of the coil circuit health. This value is used as a
baseline to determine if the coil circuit is still operating correctly.
Coil inductance (signature)
LOI menu path
Diagnostics → Advanced Diag → Meter Verif → Sensr Baseline
→ Values → Coil Inductnce
The coil inductance is a measurement of the magnetic field strength. This value is used as
a baseline to determine if a sensor calibration shift has occurred.
Electrode circuit resistance
LOI menu path
Diagnostics → Advanced Diag → Meter Verif → Sensr Baseline
→ Values → Electrode Res
The electrode circuit resistance is a measurement of the electrode circuit health. This
value is used as a baseline to determine if the electrode circuit is still operating correctly.
Advanced Diagnostics Configuration Reference Manual
November 2019 00809-0100-8782
98 Rosemount
®
8782 Slurry Magnetic Flow Meter Transmitter with HART Protocol
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