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Note: Password protection may prevent access to the acceptance criteria.
7.1 Verification procedure
1. Go to the
verification menu.
The display shows
the standard solution
to use for
verification.
Note: Menu name for
HQd meters: Run check
standard.
5. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.
Section 8 Maintenance
Regular maintenance is necessary for the best accuracy, stabilization time and life of the probe.
Keep the probe clean between measurements.
8.1 Clean the probe
Clean the probe regularly to remove mineral or sample buildup on the sensing element. Symptoms of
contamination:
• Incorrect or irregular readings
• Slow stabilization times
• Calibration errors
• Sample material stays on the probe
1. Rinse the probe with deionized water. Dry the probe with a lint-free cloth.
2. Lightly polish the probe tip with a soft cloth or cotton swab.
3. Soak the probe for 30 minutes in a 100-mg/L chloride standard solution.
2. Pour 25 mL of the
standard solution
into a 50‑mL beaker.
6. Put the probe in
the standard solution
with the sensor fully
in the solution. Do
not put the probe on
the bottom or sides
of the beaker.
3. Add one Chloride
Ionic Strength
Adjustor (ISA)
Powder Pillow.
7. Shake the probe
from side to side to
remove air bubbles.
4. Add a stir bar.
Put the beaker on an
electromagnetic
stirrer. Stir at a
moderate rate.
8. Stir for 30 to
60 seconds, then
read the value of the
standard solution.
The meter accepts
or rejects the result.
English 9
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