Hanna Instruments HI 98186 - Manual (Page 49)

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The HI 98186 meter has an internal barometer for automatic pressure
compensation for DO readings. The instrument is factory calibrated for pres-
sure measurements and no user calibration is needed. If the pressure read-
ing is inaccurate, pressure calibration should be performed.
For an accurate calibration, contact your dealer or the nearest Hanna
Customer Service Center or follow the instruction below.
In order to perform pressure calibration a reference barometer with at least
1 mmHg resolution is necessary.
Press CAL from any measure mode (DO, BOD, OUR or SOUR). The calibration
menu will be displayed.
Press Pressure functional key to select the pressure calibration. The pressure
calibration screen will be displayed.
Using the ARROW keys, enter the true local barometric pressure read from
the reference barometer. Do NOT use the pressure reported by the weather
bureau. Weather bureaus correct pressures to sea level.
When the reading is stable and close to the entered barometric pressure the
CFM functional key is displayed.
Press CFM to confirm the calibration.
The instrument will return to the main screen and will memorize the calibra-
tion data.
PRESSURE CALIBRATION PRESSURE CALIBRATION PRESSURE CALIBRATION PRESSURE CALIBRATION PRESSURE CALIBRATION