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14 Micro Motion
®
Series 3000 MVD Transmitters
NOC Overview
When a transient mist interval is detected:
• The mass flow rate over the previous n seconds is averaged and stored as the TMR M1 value,
where n is the value configured for Time Period.
• When the drive gain drops below the configured threshold for more than three seconds, the
mass flow rate over the next n seconds is averaged and stored as the TMR M2 value.
The M1 and M2 values are then averaged, and the resulting value M3 is used as the mass flow rate for
the TMR interval. See Figure 2-9 for an illustration of TMR.
Figure 2-9 TMR implementation
2.3.7 Recalculation
The Recalculation feature is used to convert existing NOC data to:
• A different reference temperature
• A different oil density at reference temperature
• A different water density at reference temperature
• A different reference density of gas
• A different reference pressure
• A different pressure compensation factor for oil
• Different shrinkage factors
For example, recalculation allows you to begin NOC measurement before precise reference values are
known, and then adjust the NOC data when the reference values are available.
During recalculation, you can change any or all of the values listed above. You can recalculate well
test results for any of the stored well tests, and you can recalculate the Continuous mode measurement
data for saved archive records.
When a well test or archive record is recalculated, the recalculated results can be saved if desired. The
original data is not overwritten.
Drive gain (actual)
Drive gain setpoint
Mass flow rate
M1
(averaged mass flow rate)
M3
(average of M1 and M2)
M2
(averaged mass flow rate)