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Overview
Flow Direction controls how forward flow and reverse flow affect flow measurement and
reporting.
Flow Direction is defined with respect to the flow arrow on the sensor:
• Forward flow (positive flow) moves in the direction of the flow arrow on the sensor.
• Reverse flow (negative flow) moves in the direction opposite to the flow arrow on
the sensor.
Tip
Micro Motion sensors are bidirectional. Measurement accuracy is not affected by actual flow
direction or the setting of the Flow Direction parameter.
Procedure
Set Flow Direction to the value you want to use.
4.4.1 Options for Flow Direction
Options for Flow DirectionTable 4-5:
Flow Direction setting Relationship to Flow Direction ar-
row on sensor
ProLink II ProLink III Field Communicator
Forward Forward Forward Appropriate when the Flow Direction
arrow is in the same direction as the
majority of flow.
Reverse Reverse Reverse Appropriate when the Flow Direction
arrow is in the same direction as the
majority of flow.
Absolute Value Absolute Value Absolute Value Flow Direction arrow is not relevant.
Bidirectional Bidirectional Bi directional Appropriate when both forward and
reverse flow are expected, and for-
ward flow will dominate, but the
amount of reverse flow will be signifi-
cant.
Negate Forward Negate Forward Negate/Forward Only Appropriate when the Flow Direction
arrow is in the opposite direction from
the majority of flow.
Negate Bidirectional Negate Bidirectional Negate/Bi-directional Appropriate when both forward and
reverse flow are expected, and reverse
flow will dominate, but the amount of
forward flow will be significant.
Configure process measurement
Configuration and Use Manual 39