Micro Motion CDM100M, Configuration And Use Manual

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Procedure
Set Flow Direction to the value you want to use.
The default setting is
Forward
.
Options for Flow Direction
Options for Flow Direction Table 4-5:
Flow Direction
setting
Relationship to Flow Direction arrow on
sensor Effect on velocity measure-
ment ProLink III Field Communica-
tor
Forward Forward Appropriate when the Flow Direction ar-
row is in the same direction as the majori-
ty of flow. No effect
Reverse Reverse
Appropriate when the Flow Direction ar-
row is in the opposite direction from the
majority of flow. No effect
Absolute Value Absolute Value Flow Direction arrow is not relevant. The absolute value of the proc-
ess variable is used.
Bidirectional Bi directional
Appropriate when both forward and re-
verse flow are expected, and forward flow
will dominate, but the amount of reverse
flow will be significant. No effect
Negate Forward Negate/Forward Only Appropriate when the Flow Direction ar-
row is in the opposite direction from the
majority of flow. The sign of the process variable
is reversed.
Negate Bidirectional Negate/Bi-directional Appropriate when both forward and re-
verse flow are expected, and reverse flow
will dominate, but the amount of forward
flow will be significant. The sign of the process variable
is reversed.
Effect of
Flow Direction
on mA outputs
Flow Direction affects how the transmitter reports velocity via the mA outputs. The mA
outputs are affected by Flow Direction only if mA Output Process Variable is set to Velocity .
Flow Direction
and mA outputs
The effect of Flow Direction on the mA outputs depends on Lower Range Value configured for
the mA output:
• If
Lower Range Value
is set to 0, see Figure 4‐1 .
• If
Lower Range Value
is set to a negative value, see Figure 4‐2 .
Configure process measurement
40 Micro Motion ® Compact Density Meters (CDM)