Hanna Instruments Edge - DO Calibration

Operational Guide
71
DO
Calibration
When the reading is stable and is within the limits,
“CFM” tag starts blinking. Press CFM to conrm the
100.0 % DO calibration.
Press CAL to leave calibration after the rst point. The instrument will display
“SAVING” message and it will return to measurement mode memorizing the
slope calibration data.
Zero Calibration
Press CAL or continue with calibration after
conrming rst point.. The meter will display “WAIT”
and “0.0 %” will be displayed in lower right corner.
Submerse the probe membrane and temperature
sensor into the beaker containing HI 7040 Zero
Oxygen solution and stir gently for 2-3 minutes. The
reading will go down.
When the reading is stable and stops decreasing,
“CFM” tag starts blinking. Press CFM to conrm the
0.0 % DO calibration.
The instrument will display “SAVING” message and
it will return to measurement mode. Rinse probe tip
o in water before taking measurements in samples.