HF scientific CLX Online Residual Chlorine Monitor (Old) - Manual (Page 22)

The next prompt will be the chlorine level assigned to the 20MA. Select the chlorine level
using the S and T buttons. Once the desired level has been set, press the  button to
accept it.
7.2 Configuring the Error Level
In case of an error in the CLX, the 4-20 mA reading can be used to indicate a problem by
sending the current to either 4.00 mA, 2.00 mA or 0 mA. If this type of error indication is
not wanted, it can be set to OFF. OFF should always be used if the CLX is used to control
dosing.
7.3 Configuring the RS–485 Port
CLX (9/07) Page 16
REV 3.1