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ODO% - Water Saturated Air Calibration
1.
Place a wet sponge into the calibration sleeve.
2.
Make sure there are no water droplets on the ODO sensor cap or
temperature sensor.
3.
Attach the probe guard and carefully slide into the calibration sleeve.
Make sure a seal is not created around the probe. Atmospheric venting is
required for accurate calibration.
4.
Turn the instrument on and wait approximately 5 to 15 minutes for the air
in the storage container to be completely saturated with water.
5.
Push the
Cal
key, then select
ODO.
Select
DO%
.
6.
Observe the actual measurement readings for stability (white line on
graph shows no significant change for 40 seconds), then select
Accept
Calibration
. “Calibration successful!” will be displayed in the message
area.
NOTE:
If you see a calibration error message, verify the barometer reading
and inspect the sensor cap. Clean and/or replace the sensor cap
as needed.
Dissolved Oxygen Calibration
Optical Dissolved Oxygen (ODO) calibration requires the current “true” barometric pressure. Make sure that the barometer is read-
ing accurately prior to ODO calibration (See 3.X Barometer).
Calibrating DO% automatically calibrates the mg/L and vice versa; there is no reason to calibrate both parameters. For both ease of
use and accuracy, YSI typically recommends calibrating DO%.
ODO mg/L Calibration
1.
Place the ODO and conductivity/temperature sensor into a water sample
that has been titrated by the Winkler method to determine the dissolved
oxygen concentration in mg/L.
2.
Push the
Cal
key, then select
ODO
. Select
DO mg/L
.
3.
Select
Calibration value.
4.
Enter the dissolved oxygen concentration of the sample in mg/L.
5.
Observe the actual measurement readings for stability (white line on
graph shows no significant change for 40 seconds), then select
Accept
Calibration
. “Calibration successful!” will be displayed in the message
area.
6.
Rinse the bulkhead and sensors in clean water then dry.
Sensors, Calibration, and Maintenance