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If the % D.O. saturation range is calibrated, the D.O. concen‑
tration 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
(4.00 to 50.00 mg/L). It is recommended to calibrate the D.O. sensor close to the values that will
be measured.
Choose “Dissolved oxygen” 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
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 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.
Note: 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 displayed.
D.O. CALIBRATION
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