In-Situ Con TROLL PRO Operators Manual (purchased after 10 May 2012) - Manual (Page 26)

800-446-7488 26 www.in-situ.com
l
Cal. Report—Choose this option to view the date of the last calibration. Press the
More button to view the Slope and Offset values. Press the OK button when
finished.
l
Defaults—Choose this option if you want to restore the default calibration.
1-Point Calibration
Water-Saturated Air
1. Place the sponge wafer in the bottom of the calibration chamber and saturate the
sponge wafer with approximately 10 mL of water.
2. Gently dry the probe and sensing material with a paper towel, making sure there is
no water on the probe and that the sensing element is free of water and fouling.
The water temperature should be similar to the sample
temperature.
Figure 5.2 Calibration chamber with water-saturated sponge.
3. Place the instrument into the calibration chamber.
Make sure there are no water droplets on the sensing element
during calibration.
4. Allow 5 to 10 minutes for temperature stabilization prior to calibration. The
calibration will stabilize automatically. Do not leave the instrument in the calibration
chamber for more than 30 minutes. This can allow condensation to form on the
sensing element, giving false low readings after calibration. If condensation does
occur, remove the restrictor, dry the sensing element, reattach the restrictor, place
the instrument in the chamber, and calibrate.
5. From the Con TROLL PRO main screen, select Menu, Calibrate, Aqua TROLL 400,
RDO.
6. Select Saturation, then select One-point cal. Select OK.