In-Situ Con TROLL PRO Operators Manual (purchased before 10 May 2012) - Manual (Page 17)

Calibrating the Probes 17
0% Calibration Point
1. Place the calibration cap (cap with vent hole) onto the top of the calibration
chamber.
2. Fill the calibration chamber to the upper fill line with approximately 60 mL of
fresh sodium sulfite solution (Figure 5).
FIGURE 5. Fill the chamber to the upper 60 mL line
Note: Make sure that the
nose cone is attached to the
probe during calibration. 3. Completely submerge the foil of the sensor, making sure that the temperature
thermistor is also completely submerged under the surface of the solution. Do
not allow the foil to rest completely on the bottom of the calibration chamber.
Leave at least ½-inch between the surface of the foil and the bottom of the
chamber.
4. You will see the Calibration Beginning icon next to the % Sat value. When the
calibration is complete, choose Stable to accept the calibration or Cancel to
return to the pre-existing calibration (Figure 6).
FIGURE 6. Beginning the two-point calibration; accepting or cancelling the calibration
5. Once calibrated, remove the sensor, and thoroughly rinse to remove any excess
sodium sulfite.
3.1.4 Calibration with the Concentration Option
1. From the Con TROLL PRO Main menu, select Calibrate, then RDO PRO, then
Concentration.
2. With the RDO PRO probe deployed in the water, take a measurement using
your method of choice.
3. Enter the value from your reference method as the “Standard Value” shown on
the Con TROLL PRO screen. Select Enter.
0% saturation—
Allow ½” (1.25 cm)
between the bottom
of the probe and the
bottom of the cup.
Cancel
0% Saturation
0.04 mg/L
23.1°C
Stable Cancel
0% Saturation
0.02 mg/L
23.1°C
Calibration beginning Accept or cancel calibration
Nominal Cancel
0% Saturation
0.02 mg/L
23.1°C
Accept or cancel calibration