Hach 2200 PCX User Manual page 18

Figure 10 Analog input wiring
1 Connect shunt resistor between voltage input and
analog ground (AINGND)
2 Voltage inputs configured to accept 4-20 mA inputs
16 English
3 0 to 5 VDC or 0 to 10 VDC from other devices.
Connect wires to AIN2-AIN7 and braided shield to
AINGND.
4 4-20 mA wires from other devices. Connect wires to
IN0, IN1, RET0 and RET1.