Problem Possible cause Solution
Sample properties cause slow
stabilization or inaccurate
measurements.
The sample temperature is
low, or there is a large
temperature difference
between samples.
Increase the sample temperature
or adjust the temperature of
different samples to be the same
(within 2 °C (3.6 °F)).
Procedure problem causes slow
stabilization and prevents
accurate calibrations or
measurements.
Air bubbles are around or
below the probe tip.
Carefully tap or shake the probe
to remove air bubbles.
The probe is not conditioned
for reducing samples.
Soak the probe in Reducing
solution for ORP electrodes for
3 to 10 minutes before sample
measurement.
The electrical connection
through the reference
junction is not sufficient.
Shake the probe in the solution
from side to side to refresh the
reference junction.
An incorrect standard
solution was used or the
standard solution has
contamination.
Use the specified standard
solution of good quality.
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 Quantity Item no.
Hach pH electrode storage solution 500 mL 2756549
3 M KCl solution 50 mL
2
2756559
Electrode cleaning solution for regular maintenance 500 mL 2965249
Electrode cleaning solution for minerals/inorganic
contamination
500 mL 2975149
Electrode cleaning solution for fats, oils and grease
contamination
500 mL 2964449
Electrode cleaning solution for porous pin/diaphragm
reference junctions
250 mL C20C380
Reducing solution for ORP electrodes 500 mL 2965349
ORP standard solution, Light's solution, 20-mL ampules 25/pkg 2612520
ORP standard solution, ZoBell's solution 500 mL 2316949
Beaker, 30 mL, plastic, colorless 80/pkg SM5010
Beaker, 100 mL, polypropylene 1 108042
Disposable wipes, 11 x 22 cm 280/pkg 2097000
Wash bottle, polyethylene, 500 mL 1 62011
Probe cable depth markers for rugged Intellical probes 5/pkg 5828610
Probe stand for standard Intellical probes 1 8508850
2
Larger quantities are available.
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