Hanna Instruments HI 9828 - Manual (Page 37)

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4.5 ATMOSPHERIC PRESSURE
For this calibration procedure a reference barometer is needed. A maximum
difference of 40 mbar between current reading and calibration point is allowed
during calibration.
4.5.1 Procedure
Choose the “Atmospheric pressure” calibration
mode in the calibration menu, then select the
calibration type using the arrow keys and confirm
the selection by pressing 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 the measure stability.
• When the reading is stable, press CONFIRM to
store the value.
• After confirmation, the following messages are displayed: “Storing data on
probe, please wait...”, “Updating GLP data, please wait...”, “Calibration com-
plete”.
• Press OK to return to the main 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
It is possible to calibrate at one custom point or
restore the factory calibration.
4.6.1 Procedure
• Select the “Custom ORP” option and press OK.
• Fill a beaker with a ORP solution (see “Accesso-
ries” section for choosing the proper HANNA
solution).
• Using the keyboard, insert the solution value and
then press OK to confirm.