
49
ODO Zero Point Calibration
1.
Place the ODO and Temperature sensors in a solution of zero DO.
NOTE:
A zero DO solution can be made by dissolving approximately 8-10
grams of sodium sulfite into 500 mL of tap water. Mix the solution
thoroughly. It may take the solution 60 minutes to be oxygen-free.
2.
Push the
Cal
key, then select
ODO
. Select
Zero
.
3.
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.
4.
Thoroughly rinse the bulkhead and sensors in clean water then dry.
5.
Perform a ODO % water-saturated air calibration after performing a zero
point calibration.
Dissolved Oxygen Sensor Maintenance
The ODO sensor should be kept clean since some types of fouling may consume
oxygen which could affect the dissolved oxygen measurements.
To clean the sensor cap, gently wipe away any fouling with a lens cleaning tissue
that has been moistened with water to prevent scratches. Do not clean the ODO
sensor with organic solvents as they may damage the cap.
To minimize sensor drift, always store the ODO sensor in a wet or water-saturated
air environment.
Short-term Storage:
Store the ODO sensor in a moist air environment. A storage sleeve with a wet
sponge is recommended.
Sensors, Calibration, and Maintenance