In-Situ Con TROLL PRO Operators Manual (purchased before 10 May 2012) - Manual (Page 16)

16 Calibrating the Probes
FIGURE 3. Fill the chamber to the lower 10 mL line
3. Gently dry the sensor and foil with a paper towel, making sure there is no water
on the body of the sensor and that the sensing foil is free of water and fouling.
Note: Make sure there are no
water droplets on the surface
of the foil when in the
calibration chamber. 4. Place the sensor in the calibration chamber so that the sensing foil is about
1 inch above the surface of the water.
5. Begin the calibration on the Con TROLL PRO.
6. Generally, you must allow 5 to 10 minutes for temperature stabilization prior to
calibration. The calibration will stabilize automatically. Do not leave the sensor in
the calibration chamber for more than 30 minutes. This can allow condensation
to form on the surface of the foil, giving false low readings after calibration. If
condensation does occur, remove sensor, dry the foil, place in the chamber, and
calibrate.
7. From the Con TROLL PRO Main menu, select Calibrate, then RDO PRO.
8. Select Saturation, then select One-point cal. The calibration begins immediately.
Note: For best results, wait
until the calibration is stable,
rather than nominal. 9. You will see the Calibration Beginning icon next to the mg/L reading. When the
calibration is complete, choose Stable to accept the calibration or Cancel to
return to the pre-existing calibration (Figure 4).
FIGURE 4. Beginning the one-point calibration; accepting or cancelling the calibration
3.1.3 Two-point Calibration (100% and 0% Saturation)
100% Calibration Point
1. Set up the calibration as described in Section 3.1.2.
2. From the Con TROLL PRO Main menu, select Calibrate, then RDO PRO.
3. Select Saturation, then select Two-point cal. The 100% saturation calibration
begins immediately.
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 pre-existing calibration
(Figure 4).
100% saturation—
Allow 1” (2.5 cm)
between the bottom
of the probe and
the top of the water.
Cancel
100% Saturation
7.04 mg/L
23.1 °C
Stable Cancel
100% Saturation
7.04 mg/L
23.1 °C
Calibration beginning Accept or cancel calibration
Nominal Cancel
100% Saturation
7.04 mg/L
23.1 °C
Accept or cancel calibration