24
Operation
5.6 Calibration
The dissolved oxygen sensor has been calibrated at the factory to the specifications listed
on Specifications on page 5. Due to the inherent accuracy and stability of the luminescent
dissolved oxygen technology, sensor calibration is seldom or never necessary. The
calibration procedures will result in an instrument offset or gain correction and may be
performed if required by regulatory agencies. The air calibration is the most accurate
method. The calibration by comparison method is the least accurate and is therefore not
recommended.
For continued accuracy and repeatability, the manufacturer recommends replacing the
sensor cap after one year of operation.
5.6.1 Calibration in Air
1. Remove the sensor from the process stream and wipe with a wet cloth to remove
debris and biological growth.
2. Place the sensor in the supplied Calibration Bag, add a small amount of water
(25–50 mL) and secure the bag to the sensor body.
3. Lay the bagged probe on a flat surface where it will not be exposed to a heat source.
4. From the Main Menu, select SENSOR SETUP and confirm.
5. Select the appropriate sensor if more than one is attached and confirm.
6. Select CALIBRATE and confirm.
7. Select AIR CAL. Select the available Output Mode (Active, Hold, or Transfer) from the
list box and confirm.
8. “Move the sensor to air” will be displayed if the sensor is moved to air (in the
calibration bag).
9. The Air Calibration procedure will begin and “Wait to Stabilize” will be displayed. The
current DO and temperature readings will be displayed. Confirm.
10. The calibration will automatically occur when the reading stabilizes or when the
reading is confirmed to base the calibration on the currently displayed value. Two to
1000 733 7000 590
1500 720 7500 579
2000 708 8000 568
2500 695 8500 559
3000 683 9000 548
3500 671 9500 538
4000 659 10000 527
4500 647 10500 517
5000 635 11000 506
5500 624 — —
Table 4 Elevation Barometric Pressure
Elevation in feet Barometric pressure in mm Hg Elevation in feet Barometric pressure in mm Hg
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