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The HI98193 meter has an internal barometer for automatic pressure compensation for DO readings.
The instrument is factory calibrated for pressure measurements and no user calibration is needed. If
the pressure reading is inaccurate, a pressure calibration should be performed.
For an accurate calibration follow the instructions below.
In order to perform a 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 / 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 within range of 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 calibration data.
PRESSURE CALIBRATION
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