125
Reference Manual
00809-0300-4750, Rev CA
Advanced Diagnostics Configuration
March 2016
Advanced Diagnostics Configuration
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.
6.9.1
Sensor baseline (signature) 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
The
coil circuit 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)
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.
LOI menu path
Field Mount: Diagnostics, Advanced Diag, Meter Verify, Sensr Baseline,
Values, Coil Resist
Wall Mount: XMTR INFO
Traditional Fast Keys
1, 2, 3, 2, 3, 1, 1
Device dashboard
2, 2, 6, 1, 1
LOI menu path
Field Mount: Diagnostics, Advanced Diag, Meter Verify, Sensr Baseline,
Values, Inductance
Wall Mount: XMTR INFO
Traditional Fast Keys
1, 2, 3, 2, 3, 1, 2
Device dashboard
2, 2, 6, 1, 2
Summary of Contents for Rosemount 8750W
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