NAVI D-25 Instruction Manual page 73

2 Taking Measurements
2.9 Dissolved oxygen (DO) measurement (D-55)
When the span
standard solution
is used:
When the zero
standard solution
is used:
62
3.
Wash the electrode with tap water, and then
immerse it in the standard solution.
Mix the sample at a constant speed (1000 – 1500 rpm)
during measurement, using magnetic stirrer. When the
sample temperature rises due to the stirrer, use a
temperature bath.
With field-use electrodes, measure at a constant flow
speed (about 30 cm in 2 seconds).
4.
Press the CAL key.
"HOLD" will blink until the reading stabilizes.
While "HOLD" is blinking
To cancel calibration: Clear the hold by pressing the CAL
key, again.
To fix the calibration value: Fix the value using the
ENTER key.
After the readout value stabilizes, the HOLD is
displayed to indicate that the calibration is
completed.
Standard
solution
HORIBA