Hanna Instruments HI 9829 Instruction Manual page 43

If the % D.O. saturation range is calibrated, the D.O. concentration range will
also be calibrated, and vice versa.
Dissolved oxygen concentration values are based
on % D.O. saturation, temperature, salinity and
atmospheric pressure. A standard solution or a
reference D.O. meter may be used to compare
readings during calibration.
The calibration of the D.O. concentration range
can only be performed at a single custom point (4 to 50 mg/L). It is recommended
to calibrate the D.O. sensor close to the values that will be measured.
Choose "DO calibration" from the "Calibration" menu, select the D.O. calibration
type using the arrow keys and press <Select> to confirm.
% D.O. saturation
The calibration of the % D.O. saturation range
can be performed at a single or 2 standard points
(0 % and 100 %), or at a single custom point (50
% to 500 %).
Procedure:
• To calibrate at 100 %, fill the calibration beaker
with approximately 4 mm (5/32") of water and
screw it onto the probe. The membrane should
not be wet. This condition corresponds to air
100 % saturated with oxygen and water vapor.
• The reading, temperature, calibration point and
the "Not ready" message are displayed.
• Once the reading has stabilized the countdown
timer will count down until the display shows
the "Ready" message.
• Press <Confirm> to accept the calibration point. After confirmation, put the
D.O. and temperature sensors into HI 7040L zero oxygen solution and wait
for stability to be reached. The stability timer will count down and <Confirm>
will appear. Press <Confirm> to store the calibration.
• The following messages will appear: "Storing" and "Calibration completed".
• Press <OK> to return to the "Calibration" menu.
• Press ESC twice to return to the main menu.
• Press <Measure> to return to the measurement screen.
Note The user can perform a single point calibration by pressing <ESC>
after the first point is accepted.
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