Ion Measurement
1. Rinse the ion selective electrode with distilled water. Place the
electrode (and temperature probe) into the sample solution and
stir gently. Note, the ion sensitive membrane and liquid junction
must be completely immersed into the solution.
2. If the Auto-Hold option in the setup menu is enabled, the meter
will automatically sense a stable reading and lock measurement,
the icon appears on the display. Press the key to resume
measuring.
If the option is disabled, the meter will continuously measure and
update the readings.
3. Wait for the measurement to stabilize and record the reading.
4. When all of the samples have been measured, rinse the electrode
with distilled water.
• During the measurement process, never wipe the ion sensitive
membrane, blot dry with a lint-free tissue to remove waterdrops
on electrode.
• If the meter is not calibrated with connected electrode, the display
will always show 0.000.
• If the meter shows ---- indicating the measurement exceeds the
range, remove the electrode from the sample immediately.
• To record the measurement at the predefined time intervals, refer
to the Interval Readings section on page 40.
Electrode Maintenance
• Rinse the ion selective electrode thoroughly with distilled water
after use, wipe clean with a lint-free tissue, then replace
protective cap and store the electrode in a dry, cool and well-
ventilated area.
• Never scratch the ion sensitive membrane on the bottom of the
electrode.
• If the electrode response becomes sluggish, soak the electrode
in 100 ppm standard solution for at least 1 hour.
Appendix
Preparation of Ion Standard Solution (1000 ppm)
1. Half fill a 1 liter volumetric flask with distilled water and add the
analytical grade reagent according to the instructions in table
below.
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