Water Hardness Measurement
1. Rinse the water hardness electrode with distilled water. Place
the electrode (and temperature probe) into the sample solution
and stir gently. Note, the 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.
Electrode Maintenance
• Rinse the water hardness 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 10 mmol/L standard solution for at least 1 hour.
Appendix
Preparation of Standard Solution (100 mmol/L)
1. Half fill a 1 liter volumetric flask with distilled water and add 14.7
grams of analytical grade calcium chloride (CaCl
2
• 2H
2
O) reagent.
2. Swirl the volumetric flask gently to dissolve the reagent and fill
to the mark with distilled water.
3. Cap and upend the volumetric flask several times to mix the
solution.
Optional Accessories
Sensors
Water hardness electrode, range: 0.05 to 200 mmol/L
Temperature probe, 3.5 mm jack plug, 1 m (3.3 ft) cable
100 mmol/L standard solution, 480 ml
Ionic strength adjuster, 480 ml
Communication and Power Supply
USB connector A to A, 1 m (3.3 ft) cable
5V DC power adapter, european standard plug
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