In-Situ RDO PRO-X Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 9)

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Calibrate the RDO PRO-X Probe
Calibrate the sensor with the Comm Kit Software and the RDO PRO Communication
Device, or calibrate the sensor directly with your controller.
1-Point Calibration
Water-Saturated Air
1. Remove the storage cap from the top of the calibration chamber and replace it with
the vented calibration cap.
1 Storage cap
2 Vented calibration cap
Figure 6.1 Storage cap and vented calibration cap shown together
2. Place the sponge wafer in the bottom of the calibration chamber and saturate with
approximately 10 mL water.
3. Gently dry the instrument and sensing material with a paper towel, making sure
there is no water or debris on the instrument or on the sensing surface.
4. Place the instrument into the calibration chamber about 2.5 cm (1 in.) above the
water-saturated sponge.
Figure 6.2 Calibration chamber with water-saturated sponge
5. Allow 5 to 10 minutes for temperature stabilization prior to starting the calibration
procedure. Do not leave the instrument in the calibration chamber for more than 30
minutes. This can allow condensation to form on the sensing material, which will
produce false low readings after calibration. If condensation does occur, remove the
instrument, dry the sensing material, place the instrument in the chamber, and
calibrate.