Ma 1 And 2 Menus (Optional) - Walchem WDP420 Instruction Manual

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
4 mA Pt
20 mA Pt
Calibrate
Fixed 4 mA Out
Fixed 20 mA Out
10.00 pH 68° F
4-20mA 12.4mA
EXIT ENTER
4-20mA_1 12.4mA
Assign pH/ORP
ENTER
EXIT
Assign pH/ORP
pH/ORP A
Assign pH/ORP
Temp A
Assign pH/ORP
pH/ORP B
Assign pH/ORP
Temp B
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.
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.
Use the arrow keys to enter the process value that you want to correspond to a 20 mA output from the
controller.
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.
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.
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.
4-20mA_1 & 2 Menu
4-20mA menu is only present if
4-20mA hardware is installed.
PREV. NEXT
4-20mA_1 12.4mA 4-20mA_1 12.4mA
Set 4mA Pt 0 Set 20mA Pt
Legend
Only appears in WDP models.
Figure 13 4-20 mA 1 and 2 Menus
37
4-20mA_1 12.4mA
0
Calibrate 4-20mA
ENTER
EXIT
Calibrate 4-20mA
Fixed 4mA Output
EXIT ENTER
Calibrate 4-20mA
Fixed 20mA Output