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10.16.2
How to assign 4-20mA output to
control increase (e.g Caustic Feed):
1- To Set 4-20mA output to control increase
press MENU
2- Use Up/Down Arrows to navigate to I/O Setup
3- Scroll to select the desired output (for example
E:4-20mA output) and press OK and then
press F2
4- Use Up/Down Arrow keys to select desired
input (here we selected pH input) then press
F1
5- The next menu will ask for interlock if any
needed if no need scroll to none then Press
F1 (you could interlock it with any digital input
for example flow switch or phantom DI)
6- Set the low pH value then press F1(in this
example if pH sensor is reading 7.00 pH the 4-
20mA will be 20mA and the Caustic pump will
be feeding at max speed)
7- Set the high pH value then press F1(in this
example if the pH sensor is reading 7.50pH,
the output will be 4.0mA and the pump should
stop)
8- In this example between pH 7.00=20mA and
7.50=4.0mA the 4-20mA output will be
proportional
9- Press Escape to finish or press F1 to continue
with output setup. You can choose to turn the
open loop alarm on or off, then choose to set
the output to drop to 0% (4mA) or remain as is
when the keypad Stop button is pressed. This
allows you to shut down the output to a pump,
or continue to send a value to a DCS.
10.16.3
How to assign 4-20mA output to
measured value (application: feedback
to PLC/DCS):
1- To Set 4-20mA output to measured value
press MENU
2- Use Up/Down Arrows to navigate to I/O Setup
3- Scroll to select the desired output (for example
E:4-20mA output) and press OK and then
press F2
4- Use Up/Down Arrow keys to select desired
input (here we selected pH input) then press
F1
5- The next menu will ask for interlock if any
needed if no need scroll to none then Press
F1 (you could interlock it with any digital input
for example flow switch or phantom DI)
6- Set the High pH value then press F1(in this
example if pH sensor is reading 14.00 pH the
4-20mA will be 20mA)
7- Set the Low pH value then press F1(in this
example if pH sensor is reading 0.00 pH the
4-20mA will be 4.0mA)
8- In this example between pH 14.00=20mA
and 0.00=4.0mA the 4-20mA output will be
proportional.
9- Note: The customer must use the same
scale. If their scale is different, one side
must change to equal the other.
10- Press Escape to finish or press F1 to
continue with output setup. You can choose
to turn the open loop alarm on or off, then
Page 85 of 102
Programming the Outputs
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