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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 / 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 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 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.
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.
D.O. CALIBRATION (HI98194, HI98196 only)
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