User Guide

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Press the CAL key at any time to exit the calibration
mode.
TEMPERATURE CALIBRATION
Each meter has been factory calibrated for the temperature with the D.O.
probe supplied and is ready for measurements.
The D.O. probes are interchangeable and no temperature calibration is
needed.
If the temperature measurements are not accurate, the temperature re-
calibration should be carried out.
For an accurate re-calibration, contact your nearest Hanna Service Center or
follow the procedure below (for technical personnel only).
INITIAL PREPARATION
• Prepare a beaker containing ice(at 0.0°C/32°F) and water and another
one containing hot water (at a tempera-
ture of 50.0°C/122°F). Place insulation
material around the container to mini-
mize temperature changes.
• Use a ChecktempC or a calibrated ther-
mometer with a resolution of 0.1°C as a
reference thermometer.
PROCEDURE
• Switch the meter on while pressing the CAL key. The “CAL” indicator will
be lit. The secondary LCD section will show “0.0°C”.
Setting the Buzzer Status
In the View Settings Mode, press the UP or DOWN arrow keys to display the
buzzer status; ON is the factory setting.
Press the CAL key to enter the change setting mode, the buzzer status will
start blinking.
Select the buzzer status (ON or CLR) by pressing the UP or DOWN arrow keys.
Press the CFM key to confirm the buzzer status.
RESET BUTTON
The RESET button is used when the instrument displays erroneous messages
due to strong electrical interference or when the instrument’s power supply
was disconnected before the meter was switched off.
It is necessary to press the RESET button and restart the entire operation.
Calibration points should remain memorized. It is recommended to verify
calibration before proceeding.