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Problem
Sample properties cause slow
stabilization or inaccurate
measurements.
Procedure problem causes
slow stabilization and prevents
accurate calibrations or
measurements.
Section 10 Consumables
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to
the company website for contact information.
Description
Hach pH electrode storage solution
Electrode cleaning solution for regular maintenance
Electrode cleaning solution for minerals/inorganic
contamination
Electrode cleaning solution for proteins/organic
contamination
Electrode cleaning solution for fats, oils and grease
contamination
Electrode cleaning solution, extra strong
10.1 Recommended standards
Description
pH color-coded buffer solution kit (NIST), 500 mL, includes:
pH 4.01 ± 0.02 pH buffer (NIST)
16 English
Possible cause
The sample absorbs carbon
dioxide (CO
) from the air,
2
which causes the pH value to
slowly decrease in low ionic
strength (LIS) or high purity
samples.
The sample temperature is
low, or there is a large
temperature difference
between samples.
The probe is not conditioned
to the sample.
Air bubbles are around or
below the probe tip.
The electrical connection
through the reference junction
is not sufficient.
The stir speed is too slow or
too fast.
An incorrect buffer solution
was used or the buffer solution
has contamination.
Solution
Use the LIS chamber for
LIS/high purity samples to
prevent CO
absorption.
2
Increase the sample temperature
or adjust the temperature of
different samples to be the same
(within 2 °C (3.6 °F)).
Soak the probe in the sample
before sample measurements.
Refer to
Preparation for use
on page 7.
Carefully tap or shake the probe
to remove air bubbles.
Shake the probe in the solution
from side to side to refresh the
reference junction.
Try a different stir speed.
Use the specified buffer solutions
of good quality.
Quantity
Item no.
500 mL
2756549
500 mL
2965249
500 mL
2975149
250 mL
C20C370
500 mL
2964449
250 mL
S16M002
Unit
Item no.
1
2947600
500 mL
2283449
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