NAVI D-25 Instruction Manual page 70

2 Taking Measurements
2.9 Dissolved oxygen (DO) measurement (D-55)
Calibrate using purified air.
(Errors may occur and considerable time may be
required before the reading stabilizes, if calibration is
conducted where there is severe fluctuation in
temperature, where there is wind or rain, or close to a
heater.)
Do not hold the sensor holder or electrode body with
your hand, during or soon before/after calibration. The
effects of body temperature will cause the reading to
take more time to stabilize.
To set the calibration value to the initial (default) settings,
press the CAL key while holding down the SET key in
the CALIBRATION mode.
When calibration is being performed in the calibration
mode, redoing calibration for a standard solution
updates the calibrated values for the standard solution
only.
If calibration is redone after returning to the
measurement mode, however, the calibration will be
performed in the initial state of the pH meter, resulting in
clearing all the previous calibration data.
D-52/53/54/55 59