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Emerson 2200S User Manual

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Configuration and Use Manual
33
Configuring Process Measurement
Op
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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  =  4 mA
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
x
0
20
16
12
-x
x
0
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
x
0
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 o
u
tput
mA o
u
tput
mA o
u
tput