Hanna Instruments HI 2400 - Manual (Page 23)

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• Submerse the DO probe in the second vessel
as near as possible to the reference thermom-
eter. Allow a few seconds for the probe to
stabilize.
• Use the ARROW keys to set the reading on
the secondary LCD to that of the hot water.
• When the reading is stable, the “ CFM” tag starts
blinking.
• Press CFM to confirm. The instrument returns to
measurement mode.
Note: If the reading is not close to the selected calibration point,
“ WRONG” tag will blink. In this case, check if the value set on the
secondary LCD and the temperature measured with reference
thermometer are close. Change the DO probe or restart calibration
if necessary.