Hanna Instruments HI 98280 User Manual

Page 38

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 .
• To perform a pressure calibration at a custom

point, select the “Custom pressure” option.

• Select the measure unit with the key

and insert the pressure value with the keyboard.

• Press and wait for stable reading, then

press 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 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 .

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

• 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 to confirm.

• When the reading is stable, press

to store the calibration point.