NAVI D-25 Instruction Manual page 56

● Ion measurement
D-52/53/54/55
1.
Wash the tip of electrode well with pure (de-
ionized) water, and then wipe with filter paper or
tissue paper.
Do not touch or scratch the responsive membrane on
the ION electrode.
2.
Immerse the electrode in the sample to a
sufficient depth (at least 3 cm).
Mix the standard solution at a constant speed (300 – 500
rpm), using a magnetic stirrer. Measure the standard
solution and the sample that is to be measured while
they are at close to the same temperature as possible.
3.
Press the MEAS key with the initial screeen
displayed.
"HOLD" will blink on the display until the reading
stabilizes.
When the value stabilizes, "HOLD" will stop blinking and
will be displayed continually. The indicated value will
remain displayed.
Refer to the " Criteria for judging stability" page 23 for the
criteria for judging the stability of a readout.
2 Taking Measurements
2.7 Ion measurement (D-53)
45