Technical data

3.6.2 Cross-flow
Cross-flow is a dimensionless measure of the flow symmetry comparing the chords on one
side of the meter to the chords on the other side. It is readable via the CrossFlow data
point. Ideally the Cross-flow should be 1.0.
3.6.3 Chord turbulence
Chord Turbulence is a estimate of the turbulence (percentage) at a chord location. A value
is calculated for each active chord and is readable via the TurbulenceA, TurbulenceB,
TurbulenceC, or TurbulenceD data points. A value of 0% indicates no appreciable
turbulence.
3.6.4 Profile factor
The profile factor is a dimensionless ratio of the inner chord velocities to the outer chord
velocities. It is readable via the ProfileFactor data point. Ideally the Profile Factor should be
1.17 ±0.05 for 3814 meters and 1.0 for 3812 meters.
3.6.5 Swirl angle
The swirl angle is an estimate of the swirl (to the nearest degree) and is readable via the
SwirlAngle data point. It is calculated as a function of the meter body style (3814) and
Profile Factor (see above). A value of 0 degrees indicates no appreciable swirl.
3.6.6 Reverse flow detection
Reverse flow direction is detected if the meter has accumulated a reverse flow volume
greater than a user-configurable limit set in the Reverse Flow Volume Limit. See
Reverse flow alarm to configure the volume limit.
Flow measurement
Operations 25