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Single point Custom % saturation calibration
• For a calibration at another known value place sensor and temperature probe into the known solution
and change the calibration value, press the <Cal. point> softkey and select the desired point.
• To insert a different calibration value, press <Cal. point> and then <Custom>. Insert the
desired value using the keypad, then press <Accept>.
• When the reading is stable, the “Ready” message is displayed. Press <Confirm> to store the
calibration point.
• 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.
D.O. concentration
Verify the barometric pressure, conductivity and temperature
reading are correct. Calibrate them if necessary. To calibrate
the D.O. concentration range, a solution with known Dissolved
Oxygen concentration value is needed. The solutions used
to calibrate with should be determined independently (for
instance by Winkler titration). Place the D.O. sensor with
temperature sensor into the known solution.
• From the “DO calibration” menu, select the “DO concentration” option, insert the known concen‑
tration. Allow time for the sensors to reach thermal equilibrium with the solution. Stir or agitate if
possible to keep fresh solution in front of the membrane and press <OK>.
• When the reading is stable, the stability timer will count down and <Confirm> will appear. Press
<Confirm> to accept the value.
• When the messages “Storing” and “Calibration completed” appear, the calibration is completed.
To return to the “Calibration” menu, press <OK>.
• To return to the main menu, press ESC twice.
D.O. CALIBRATION
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