Hach 5740sc, User Manual, Page: 19 / 50

19
sc100 Operation
4.5 Calibration
The dissolved oxygen sensor has been calibrated at the factory ( Specifications on
page 5 ). The calibration procedures that follow will result in an instrument offset or gain
correction and may be performed if required by your regulatory agency. The air calibration
is the most accurate method.
4.5.1 Calibration in Air
Step Select Menu Level/Instructions Confirm
1 —
Remove the probe from the process stream and wipe with a wet cloth to remove
debris and biological growth.
—
2 —
Place the probe in the supplied Calibration Bag, add a small amount of water (25–50
mL) and secure the bag to the probe body.
—
3 — Remove the bagged probe from any heat source. . —
4 MAIN MENU —
5 SENSOR SETUP
6 Highlight the appropriate sensor if more than one sensor is attached.
7 CALIBRATE
8 AIR CAL
9 Choose from the available Output Mode options (Active, Hold, or Transfer).
10 — “Move the sensor to air”. The probe has been moved to air (in the calibration bag).
11 —
The Air Calibration procedure will begin and “Press Enter When Stable”, the current
DO and temperature readings will be displayed.
12 —
The calibration will automatically be performed when the reading stabilizes (maximum
45 minute time-out) or press
ENTER
to accept the currently displayed value. One of the
responses from Table 4 will be displayed:
13 Follow the prompts to return the probe to the process —
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