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its calibration data for a few months. However, for optimal accuracy, it is recommended that the
oxygen saturation calibration be performed according to section 5.3.1 before use every day.
b)
Drying of the surface coating of the sensor cap can adversely affect the stability of the measurement.
Please pay special attention to this situation. See Section 4.2 (Probe Maintenance) for details.
c)
The instrument has factory default setting function, select
YES
in parameter setting P3.5, the meter
will be calibrated to the theory value.
5.5
Measurement of water samples
5.5.1
When measuring, place the probe in your sample solution, stir quickly for a few seconds in the
solution to remove bubbles from the measuring surface of the sensor cap. Then hold the probe still and
wait for a stable measurement. The solution must be above the immersion line of the probe.
Note:
the brief stirring of the probe in solution is only to eliminate bubbles. Unlike conventional
galvanic/polarographic electrodes, the measuring via optical dissolved oxygen probes does not require
constant stirring of the solution or flowing fluid.
5.5.2
Users can read the measurements when appears and stays on. Note that the measurement
time is related to temperature. When the solution temperature and the probe temperature is close, it
takes about one minute to get the readings stabilized. When the solution temperature and the
electrode temperature differ a lot, it takes about 3 minutes to reach a stable reading. This is because the
reading of dissolved oxygen is heavily
5.6
Self-diagnosis information
During the process of calibration and measurement, the meter has self-diagnosis functions,
indicating the relative information as below, please refer to Table -2.
Table
–
2
6
Parameter Setting
6.1
Main menu of parameter setting
Long press in measurement mode, the meter enters P4.0 mode, and then press or to
change menu P4.0→P6.0. For details, please see Diagram –
10. P4.0: sub-menu of DO parameter setup;
P6.0: basic parameter setup menu.
Display Icon
Contents
Checking
Press fff when reading value is not
stable during calibration.
Press after icon displays and stays
on screen.
Submenu of DO parameter setting
P4.1
Resolution
P4.2
Salinity setup
P4.3
Air pressure adjustment
P4.4
DO unit
P4.5
Factory default setting
Main menu of parameter setting
