Hanna Instruments HI 98280 - Manual (Page 38)

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4.5 ATMOSPHERIC PRESSURE CALIBRATION
For this procedure a reference barometer is needed. During calibration the cur-
rent reading can differ up to 40 mbar from the calibration point.
Choose the “Atmospheric pressure” option from
the “Calibration” menu, then select the calibra-
tion type using the arrow keys and press <OK>.
• To perform a pressure calibration at a custom
point, select the “Custom pressure” option.
• Select the measure unit with the <Unit> key
and insert the pressure value with the keyboard.
• Press <OK> and wait for stable reading, then
press <Confirm> to store calibration data.
• After confirmation, the following messages are
displayed: “Storing data on probe, please wait...”, “Updating GLP data, please
wait...” and “Calibration completed”.
• Press <OK> to return to the “Calibration” menu.
• To return to the main menu, press ESC repeatedly.
• To restore the factory calibration, select the corresponding option in the “Pres-
sure calibration” menu and then press <OK>.
4.6 ORP CALIBRATION
The “ORP calibration” menu allows to perform a single point custom calibration
or to restore the factory calibration.
• Select the “Custom ORP” option and press
<OK>.
• Fill a beaker with a ORP solution (see “Accesso-
ries” section to choose the proper HANNA so-
lution).
• Using the keyboard, insert the solution value and
then press <OK> to confirm.
• When the reading is stable, press <Confirm>
to store the calibration point.