User Guide

10
to the meter and properly polarized.
For an accurate calibration, it is recommended
to wait for 5 or 10 minutes to ensure precise
conditioning of the probe.
Keep the protective cap on during the polar-
ization time and remove it for the calibration
and the measurements.
Follow the calibration procedure on page 17.
D.O. MEASUREMENTS (in ppm or in %)
Make sure the meter has been calibrated
(see page 17) and the protective cap has
been removed.
Salinity and Altitude compensation
If the sample contains significant concen-
tration of salinity or if you are performing
measurements at an altitude different from
sea level, the readout values must be cor-
rected, taking into account the lower de-
gree of oxygen solubility in such occasions
as explained on pages 23-25.
Remember to set the altitude and/or the
salinity before taking any D.O. measure-
ments. The meter will automatically com-
pensate for these factors.
Taking measurements
Immerse the tip of the probe in the sample to
be tested. Make sure the temperature sensor
is also immersed.
Press the RANGE key to dis-
play D.O. measurements. Al-
low approximately one minute
for the meter to stabilize and
read the ppm value of dissolved oxygen on
the display.
RANGE