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Manual mode
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during operation or stop. The green LED bar lights during operation. See page 58 for detail.
EXT mode
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Select a proportional control pattern. 4 - 20mA, 20 - 4mA, 0 - 20mA and 20 - 0mA are available. During opera-
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rate display, push the key.
The left graph shows the flow rate at each
pattern.
a. 4 - 20mA
b. 20 - 4mA
c. 0 - 20mA
d. 20 - 0mA
*
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beneath the minimum rate.
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rate at any current value.
Example of use: pH control in a water treatment system
0
4
20
a
d
c
b
Flow rate
[L/H]
4-20mA analog signal
Max
Min
Operational functions
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(Push key)
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Run
Stop
Run
Stop
Supply tank
pH meter
Electrode
Pump
4-20mA signal