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Effect of Flow Direction on the mA output: Lower Range Value < 0Figure 4-2:
Flow Direction = Forward
mA output
-x 0 x
Reverse flow Forward flow
20
12
4
Flow Direction = Reverse, Negate Forward
mA output
-x 0 x
Reverse flow Forward flow
20
12
4
Flow Direction = Absolute Value, Bidirectional,
Negate Bidirectional
mA output
-x 0 x
Reverse flow Forward flow
20
12
4
• Lower Range Value = −x
• Upper Range Value = x
Example: Flow Direction = Forward and Lower Range Value = 0
Configuration:
• Flow Direction = Forward
• Lower Range Value = 0 g/sec
• Upper Range Value = 100 g/sec
Result:
• Under conditions of reverse flow or zero flow, the mA output is 4 mA.
• Under conditions of forward flow, up to a flow rate of 100 g/sec, the mA output
varies between 4 mA and 20 mA in proportion to the flow rate.
• Under conditions of forward flow, if the flow rate equals or exceeds 100 g/sec, 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.
Example: Flow Direction = Forward and Lower Range Value < 0
Configuration:
• Flow Direction = Forward
• Lower Range Value = −100 g/sec
• Upper Range Value = +100 g/sec
Result:
• Under conditions of zero flow, the mA output is 12 mA.
• Under conditions of forward flow, for flow rates between 0 and +100 g/sec, the mA
output varies between 12 mA and 20 mA in proportion to (the absolute value of) the
flow rate.
Configure process measurement
Configuration and Use Manual 41