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5.5 4 to 20 mA Output configuration
The WG-602 TCL analyzer includes 2 built-in 4/20 mA analog outputs that can
be used for any of the measured parameters. If required, there is an option to
add additional 4 outputs on the "Conductivity / NTU card". For additional
information about the "Conductivity / NTU card" contact your local representative.
Set the 4-20 mA outputs
The menu for "4-20 mA output settings" is found in the technician menu (#81).
1. Enter
the technician menu and scroll until “4-20mA output settings” appears in
the LCD display (#81).
2. Press OK.
3. Enter the technician password and press OK.
4. Select "Built-in ch. # (1 or 2)" and press OK.
5. Select parameter (Cl for free chlorine reading, pH, etc.) and press OK.
6. Select "Set value for 4mA" and press OK.
7. Select "Set value for 20mA" and press OK.
8. Select "set test channel" (to be used for troubleshooting purposes or initial
tests): 2mA, 4mA, 12mA, 20mA, and press OK.
9. Press Esc to return to the set-up menu and repeat the above steps for all active
4/20 mA outputs.
Set the 4/20 mA alarm
The menu for "On alarm go to" is found in the technician menu (#82).
This is the 4-20mA output value that will indicate whenever an alarm condition exists
or communication between the analyzer and 4-20 module is interrupted.
1. Enter
the technician menu and scroll until “On alarm go to” appears in the LCD
display (#82).
2. Press OK.
3. Enter the technician password and press OK.
4. Press OK again.
5. Select the desired output 2mA, 4mA, 20mA, or hold and press OK.
6. Press Esc to return to the main display.
NOTE:
The alarm will not activate at low or high chlorine levels. It will only go on in case of
low or no flow and /or when there is a communication failure between the analyzer
and the mA output i.e. power failure.
Confirming operation and communication
Prior to connecting to the external monitoring or control system, it is best to confirm
that all desired outputs are working properly using a digital multimeter. This must be
done without output wires connected to an external system. Set the multimeter to
measure current and connect the multimeter to an active output (an output is inactive
if it does not have a chipset installed next to the terminal block). Record the output in
mA and confirm that the value is accurate using the following equation:
mA=[16 X (Measured Value - Min Value)] / [Max value-Min Value] + 4
