In-Situ RDO PRO Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 7)

2.2 2-point Calibration
2.2.1 100% Calibration Point
Perform a water-saturated-air calibration as previously described.
2.2.2 0% Calibration Point
1. Remove the water-saturated sponge from the calibration chamber and fill the chamber to the fill
line with approximately 60 mL of fresh sodium sulfite solution.
1 Fill line
2 Temperature sensor
2. Place the probe into the solution. Leave at least 13 mm (0.5 in.) between the surface of the
sensing element and the bottom of the chamber.
3. Ensure that the temperature sensor is completely submerged in the solution.
4. Wait at least 5 minutes for the temperature to stabilize prior to performing the calibration
procedure.
5. Once the calibration is complete, remove the probe and thoroughly rinse to remove all of the
sodium sulfite.
Page 7 Calibrate the RDO PRO Probe