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6.4
Ion measurement
6.4.1
Rinse the fluoride ion combination electrode and the temperature probe in distilled or
deionized water, allow it to dry, dip it into the sample solution, stir gently and let it stand
still and wait for the reading to be stable. When the stable icon displays on LCD, get
the reading which is the concentration of the F
-
.
6.4.2
Press to switch among other ion concentration units: m
ol/L→
mg/L (p
pm) →pX
.
6.4.3
The calibration and the measurement of the ion electrode is complicated. Sometimes user
needs to add the ion strength adjuster buffer or use a magnetic stirrer to improve. Please
refer to the ISE user manual for the electrode maintenance, activation, sample preparation
and other important information involving the calibration solution and the ion strength
adjuster buffer solution.
6.4.4
Factory default setting
For factory default setting, please refer to parameter setting P5.3. All calibration data is deleted,
and the meter restores to the theory value. Some functions restore to the original value (refer to
appendix - 1). When calibration or measurement fails, please restore the meter to factory default
and then perform re-calibration or measurement. Please note once factory default setting is set, all
the data deleted will be irretrievable.
6.5
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 - 6.
Table - 6 Self-diagnosis information
Display Icons
Contents
Checking
Press when measuring value
is not stable during calibration.
Press after icon displays and
stays on screen
During calibration, the measuring
value being unstable (≥3min).
Check whether the ISE works properly and
refer to the ISE user manual.
ISE slope<75%
Check calibration solution and the ISE, re-
calibrate.
