Reversible Input Protection and Operation
Improper wiring is an easy way to waste hours of time troubleshooting. It also has the potential to damage your expensive sensors if current is applied along the wrong wire.
Reversible input protection is a feature that prevents both problems to create a water quality sensor that is easy to install without worries of frying any electronics. The two wires for each channel are interchangeable to power the sensor or output the 4-20 mA signal, as shown in the diagram below.