In-Situ Con TROLL PRO Operators Manual (purchased after 10 May 2012) - Manual (Page 27)

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7. You will see the “Calibration Beginning” icon next to the mg/L reading. When the
calibration is complete, select Stable to accept the calibration or Cancel to return to
the pre-existing calibration.
Figure 5.3 Beginning the 1-point calibration; accepting or canceling the calibration
2-Point Calibration (100% and 0% Saturation)
100% Calibration Point
1. Set up the calibration equipment. See "1-Point Calibration" on page 26.
2. From the Con TROLL PRO main screen, select Menu, Calibrate, Aqua TROLL 400,
RDO.
3. Select Saturation, then select Two-point cal. Select OK.
4. You will see the Calibration Beginning icon next to the % Sat value. When the
calibration is complete, choose Stable to accept the 100% calibration point and
proceed to the 0% point or Cancel to return to the previous calibration.
5. If you press Stable, the values for the first calibration point will be stored, and you
will be prompted to place the probe in the standard solution for the next calibration
point.
0% Calibration Point
1. Fill the calibration chamber to the fill line with approximately 150 mL of fresh sodium
sulfite solution.
Figure 5.4 Fill the chamber with sodium sulfite to the fill line.
2. Completely submerge the RDO Sensor under the surface of the solution.
3. Select OK.