Operation and Maintenance
UFM Series 6
Q.Sonic-plus
8.2.5 Presentation of AGC-Levels and AGC-Limits
AGC limits and levels are presented in decibels (dB).
The AGC ratio (AGC-limit / AGC-level) largely depends on the meter size
and application (operating pressure, amount of CO2, control valve nearby,
etc.). It is preferred to have a high AGC ratio.
The change of the AGC ratio over time is a very useful parameter to predict
the performance of the meter in the future.
8.2.6
Swirl Angle
If your meter is equipped with a swirl path, this value indicates the amount of
swirl measured by an ultrasonic flow meter, expressed in degrees. A positive
swirl angle indicates clockwise swirl, whilst a negative swirl angle indicates
counter-clockwise swirl. The meter operates reliably if the angle is between
-20° and +20°. If the indicated swirl angle exceeds these values please
consult Elster for support.
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