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Reference Manual
00809-0100-4665, Rev AA
August 2010
Rosemount 8732
C-8
8714I METER
VERIFICATION
The 8714i Meter Verification diagnostic provides a means of verifying the
flowmeter is within calibration without removing the sensor from the process.
This is a manually initiated diagnostic test that provides a review of the
transmitter and sensors critical parameters as a means to document
verification of calibration. The results of running this diagnostic provide the
deviation amount from expected values and a pass/fail summary against
user-defined criteria for the application and conditions.
Initiating 8714i Meter Verification
The 8714i Meter Verification diagnostic can be initiated as required by the
application. If the advanced diagnostic suite (D02) was ordered, then the
8714i Meter Verification diagnostic will be available. If D02 was not ordered or
licensed, this diagnostic will not be available.
Sensor Signature
Parameters
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.
Establishing the baseline sensor signature
The first step in running the 8714i Meter Verification test is establishing the
reference signature that the test will use as the baseline for comparison. This
is accomplished by having the transmitter take a signature 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. The
sensor signature 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 signature procedure when there is flow in
the line is permissible, but this may introduce some noise into the signature
measurements. If an empty pipe condition exists, then the sensor signature
should only be run for the coils.
Once the sensor signature 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.
8714i Meter Verification
Test Scope
The 8714i Meter Verification can be used to verify the entire flowmeter
installation, or individual parts such as the transmitter or sensor. This
parameter is set at the time that the 8714i Meter Verification test is initiated.
All
Run the 8714i Meter Verification test and verify the entire flowmeter
installation. This parameter results in the verification test performing the
transmitter calibration verification, sensor calibration verification, coil health
check, and electrode health check. Transmitter calibration and sensor
calibration are verified to the percentage associated with the test condition
selected when the test was initiated.
Flowtube Sensor
Run the 8714i Meter Verification test on the sensor only. This results in the
verification test checking the sensor calibration to the limits of the test criteria
selected when the 8714i Meter Verification test was initiated, verifying the coil
circuit health, and the electrode circuit health.