In-Situ RDO PRO-X Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 15)

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Analog (4-20 mA) 3-wire
Signal Color
Ground/Return Black
External Power (12-36
VDC)
Red
4-20 mA Brown
Cable length must not exceed 1219 m (4000 ft.)
Analog signal must be enabled in Win-Situ 5 Software or the
Comm Kit Software prior to use.