In-Situ RDO PRO-X Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 10)

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2-Point Calibration
100% and 0% Saturation
1. Set up the calibration procedure as previously described, and perform a water-
saturated air calibration.
2. 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 instrument into the solution. Leave at least 13 mm (0.5 in.) between the
surface of the sensing material and the bottom of the chamber.
3. Ensure that the temperature sensor is completely submerged in the solution.
4. Allow at least 5 minutes for the temperature to stabilize prior to performing the
calibration procedure.
5. Once calibration is complete, remove the sensor, and thoroughly rinse to remove all
of the sodium sulfite.