Hanna Instruments HI98194 Instructions Manual page 36

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
% 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 approxi‑
mately 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
HI7040
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.
Notes: The user can perform a single point calibration by pressing ESC after the first point is
accepted.
If the D.O. input is not within the acceptable range, the message "Invalid input" is dis-
played.
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/ keys and press Select to confirm.
zero oxygen solution and wait for stability to be reached. The stability timer will count
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