NAVI D-25 Instruction Manual page 71

2 Taking Measurements
2.9 Dissolved oxygen (DO) measurement (D-55)
● Measuring DO
60
Salinity concentration correction is set at 0.0 ppt, as the
default. To change this setting, refer to "3.4.12 DO
salinity compensation setting (D-55 )" page 88.
1.
Immerse the electrode in the sample.
Mix the sample at a constant speed (1000 – 1500 rpm)
during measurement, using a 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).
2.
Press the MEAS key while the Instantaneous
Measurement screen is displayed.
The measured value will be displayed, and
"HOLD" will blink until the reading stabilizes. When
the measured value stabilizes, "HOLD" will stop
blinking and the calibrated value will be displayed.
Refer to " Criteria for judging stability" page 23 for the
criteria for judging the stability of the readout.
To store the data, press the ▲ DATA IN key.
The memory number will appear and the display will
automatically return
Measurement screen.
to the Instantaneous Value
HORIBA