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Configuration and Use Manual 33
Configuring Process Measurement
Operation AppendicesMaintenance and TroubleshootingCommissioning
Options for Flow Direction include:
•Forward
•Reverse
• Absolute Value
• Bidirectional
• Negate/Forward
• Negate/Absolute Value
Effects of flow direction
For the effect of Flow Direction on the mA output (i.e., a flow variable has been assigned to the mA
output):
• See Figure 4-1 if the LRV is set to 0 (zero flow).
• See Figure 4-2 if the LRV is set to a negative value.
In both figures, the mA output scale is 12–20 mA. If your installation includes the Micro Motion
adapter-barrier, adjust the y axis as follows:
•URV = 20 mA
• Midpoint = 12 mA
•LRV = 4mA
For a discussion of these figures, see the examples following the figures.
For the effect of Flow Direction on totalizers and the flow values reported via digital communications,
see Table 4-2.
Figure 4-1 Effect of flow direction on mA output: LRV = 0
Reverse
flow
(1)
20
16
12
x0
20
16
12
-x x0
mA output configuration:
•URV = x
•LRV = 0
To set the LRV and URV, see Section 6.2.2.
Forward
flow
(2)
Zero flow
Reverse
flow
(1)
Forward
flow
(2)
Zero flow
Flow direction parameter:
• Forward only
Flow direction parameter:
• Reverse only
• Negate/Forward only
20
16
12
-x x0
Reverse
flow
(1)
Forward
flow
(2)
Zero flow
Flow direction parameter:
• Absolute value
• Bidirectional
• Negate/Bidirectional
(1) Process fluid flowing in opposite direction from flow direction arrow on sensor.
(2) Process fluid flowing in same direction as flow direction arrow on sensor.
-x
mA output
mA output
mA output