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5.7
4-20 mA 1 and 2 Menus (Optional)
These menus will only appear if the optional 4-20 mA output board(s) is installed. They are used to set
the scale of the 4-20 mA output. It contains the following menu selections: Assign Inputs, 4 mA Point,
20 mA Point, and Calibrate.
Note: When programming the controller for the first time, first go to the Assign Inputs Menu, then
program the other menus.
Assign Inputs
Press
ENTER
to assign the 4-20 mA output to a sensor input. Use the arrow keys to toggle between
“pH/ORP” and “Temp.” Press
ENTER
when the desired choice is displayed.
4 mA Pt
Use the arrow keys to enter the process value (in either pH units, or mV if ORP) that you want to correspond
to a 4 mA output from the controller.
20 mA Pt
Use the arrow keys to enter the process value that you want to correspond to a 20 mA output from the
controller.
Calibrate
This menu is used to calibrate instruments connected to the mA output. The 4-20 mA output is extremely
accurate and stable and therefore will never need calibration. This feature allows other devices to be
calibrated at the 4 and 20 mA points. Press
ENTER
to start the calibration.
Fixed 4 mA Out
The controller will output 4.00 mA. Adjust the chart recorder or data logger per its instruction so that the
process value displayed is what is expected for a 4.00 mA input.
Fixed 20 mA Out
As above, except that the controller will output 20.00 mA.
The design of the 4-20 mA output is such that it should never need calibration. If the mA signal is not what
it should be, call the factory for service.
10.00 pH 68° F
4-20mA 12.4mA
4-20mA_1 12.4mA
Assign pH/ORP
4-20mA_1 12.4mA
Set 4mA Pt 0
4-20mA_1 12.4mA
Calibrate 4-20mA
Assign pH/ORP
pH/ORP A
Assign pH/ORP
Temp A
4-20mA_1 & 2 Menu
ENTER
EXIT
NEXT
PREV.
4-20mA menu is only present if
4-20mA hardware is installed.
ENTER
EXIT
Calibrate 4-20mA
Fixed 4mA Output
Calibrate 4-20mA
Fixed 20mA Output
ENTER
EXIT
ENTER
EXIT
4-20mA_1 12.4mA
Set 20mA Pt 0
Assign pH/ORP
pH/ORP B
Assign pH/ORP
Temp B
Only appears in WDP models.
Legend
Figure 13 4-20 mA 1 and 2 Menus
