User Guide

21
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 should the
probe be replaced.
If, for any reason, the temperature measure-
ments are out of accuracy, 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
temperature of 50.0°C/122°F). Place insu-
lation 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".
CAL
CAL
°C
ON