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44 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Configuring Inputs
Figure 7-4 Effect of flow direction on milliamp outputs: 4 mA value < 0
Example 1
Configuration:
• Flow direction = Forward only
• mA output: 4 mA = 0 g/s; 20 mA = 100 g/s
(See the first graph in Figure 7-3.)
As a result:
• Under conditions of reverse flow or zero flow, the mA output is
4mA.
• Under conditions of forward flow, up to a flow rate of 100 g/s, the
mA output varies between 4 mA and 20 mA in proportion to (the
absolute value of) the flow rate.
• Under conditions of forward flow, if (the absolute value of) the flow
rate equals or exceeds 100 g/s, the mA output will be proportional
to the flow rate up to 20.5 mA, and will be level at 20.5 mA at
higher flow rates.
Reverse
flow
(1)
mA output
20
12
4
–x x0
20
12
–x x0
Milliamp output configuration:
• 20 mA value = x
• 4 mA value = –x
• –x < 0
To set the 4 mA and 20 mA values, see
Section 8.4.4.
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
12
4
–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.
mA output
mA output
4