Calibration; Calibration In Air - Hach 5740sc User Manual

4.5 Calibration

4.5.1 Calibration in Air

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The dissolved oxygen sensor has been calibrated at the factory
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.
Remove the probe from the process stream and wipe with a wet cloth to remove
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.
Remove the bagged probe from any heat source. .
Highlight the appropriate sensor if more than one sensor is attached.
Choose from the available Output Mode options (Active, Hold, or Transfer).
"Move the sensor to air". The probe has been moved to air (in the calibration bag).
The Air Calibration procedure will begin and "Press Enter When Stable", the current
DO and temperature readings will be displayed.
The calibration will automatically be performed when the reading stabilizes (maximum
45 minute time-out) or press
responses from
Follow the prompts to return the probe to the process
Menu Level/Instructions
debris and biological growth.
MAIN MENU
SENSOR SETUP
CALIBRATE
AIR CAL
to accept the currently displayed value. One of the
ENTER
Table 4 will be displayed:
sc100 Operation
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