Hanna Instruments HI98193 - Two-Point and Manual Calibration

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Press CFM to confirm the calibration point.
The instrument will return to the main screen and will memorize the slope calibration data.
Two points automatic calibration
Submerge the probe into HI7040 zero oxygen solution and stir gently for 2‑3 minutes.
Press CAL. The calibration menu will be displayed.
Press DO to select the DO calibration. The DO calibration screen will be displayed and the standard
0% saturation (0 mg/L) will be automatically selected.
The hourglass icon will be shown on the display until the reading becomes stable.
When the reading is stable and within range of the selected standard, the CFM functional key is
displayed.
Press CFM to confirm the calibration point.
The meter will automatically select the 100% saturation (8.26 mg/L) standard.
Gently shake the probe dry. Leave the probe in air.
The hourglass icon will be shown on the display until the reading becomes stable.
When the reading becomes stable within an acceptable range of the selected standard, the CFM
functional key is displayed.
Press CFM to confirm the calibration point. The instrument will return to the main screen and will
memorize the calibration data.
One point manual calibration
First determine the dissolved oxygen value of the sample (use a Winkler titration). Place the probe in
the sample and provide adequate stirring.
Access the DO calibration screen as described in the previous DO calibration procedures.
Press the Manual functional key.
The standard value can be changed using the / keys in the range 0 to 100% saturation or
0.00 to 8.26 mg/L, depending on the currently selected measuring unit.
Set the standard value using the / keys to the determined DO value.
The hourglass icon will be shown on the display until the reading becomes stable.
When the reading is stable and within range of the selected standard, the CFM functional key is
displayed
DO CALIBRATION PROCEDURE
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