If is necessary to convert the crack meter signal in 4-20mA that allows to exceed connecting distances and more sensitivity to the background noises; OTR suggests Signal Converters from 3-wires potentiometers to 2-wires 4-20 mA.

The convertes can deliver a 4-20mA output with different impedences. The converter is adapt to every half gate sensor between 800ohm and 20Kohm. The circuit has two terminal blocks for every input/output lines and a discharge protection toward mass.