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.
2. Pour the fresh
standard solution
into a beaker.
3. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.
4. Put the probe in
the standard solution
with the sensor and
reference junction
fully in the solution.
Do not put the probe
on the bottom or
sides of the beaker.
5. Shake the probe
from side to side to
remove air bubbles.
6. Stir gently, then
read the mV value of
the standard
solution. The meter
accepts or rejects
the result.
Section 8 Maintenance
Regular maintenance is necessary for the best accuracy, stabilization time and life of the probe.
Keep the probe in the recommended storage solution between measurements.
8.1 Clean the probe
Clean the probe regularly to remove contamination and to keep the reference junction open.
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. Blot dry with a lint-free cloth.
2. Soak the probe sensor and platinum disc in electrode cleaning solution or warm detergent
solution for a maximum of 15 minutes.
Note: Remove the shroud on a rugged probe before cleaning. Install the shroud after the probe is clean. Refer
to Remove or install the shroud on page 10.
3. Rinse the probe with deionized water. Blot dry with a lint-free cloth.
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