User Guide

1526
• Dry the probe tip and allow a few minutes for the LCD readout to stabilize.
The “~” indicator will blink until the reading is stable.
As soon as the reading is stable, the “CFM” indicator will start blinking. Press
the CFM key to confirm the “100.0%” D.O. reading.
• If the reading is not close to the selected value,“WRONG “ and
“WRONG ” will blink alternatively.
• If the reading is within the margins (±15%), the meter stores the value
(and adjusts the slope point). The calibration is ended and the meter will
then revert to the normal measurement mode.
Note: HI 2400 has automatic buffer recognition function. Press the UP or
DOWN arrow keys to select the desired calibration value, but if these
keys are pressed, the automatic buffer recognition function is disabled.
TEMPERATURE COMPENSATION
The D.O. probe has a built-in sensor for temperature so that the D.O.
readings are automatically compensated for temperature effects.
LOGGING FUNCTION
This function allows the user to log D.O. (in ppm or %) together with the
temperature automatically for long periods of time. All logged data can be
stored into a PC through the RS232C port.
The lot number goes from 1 to 99 and then back to #1. The maximum
capacity per lot is 8000 samples.
Set the appropriate logging interval (see page12). Select between 1, 15, 30
seconds or 1, 5, 30, 60, 120, 180 minutes.
Press the RANGE key first (to select D.O. read-
ings in ppm or in %), then press the LOG and
then CAL key to enter the logging mode.
Once in the logging mode, the interval cannot be changed.
Exit the logging mode first (by pressing the LOG and then CAL key) before
setting a new interval.