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Troubleshooting
Message or
symptom
Possible cause Action
Probe not supported
Software not updated
Update the HQd software to the newest revision at
www.hach.com/SoftwareDownloads. Refer to the HQd
Series Meter Manual.
HQd meter does not support IntelliCAL
probe.
Contact a Hach Technical Support Representative.
Connect a probe or
Probe requires
service
Electrode not connected properly
Disconnect, then connect the electrode. Tighten the
locking nut.
Software not updated
Update the HQd software to the newest revision at
www.hach.com/download-resources.
Damaged electrode
Verify connectivity with another electrode or meter to
confirm isolated issue with the electrode. Contact a Hach
Technical Representative.
Large number of methods stored on
probe.
Continue to let probe connect. Do not disconnect probe.
Standard not
recognized error
Storage cap not removed. Remove storage cap.
Incorrect or contaminated standard
solution
Use fresh standard solution as specified in
the method.
mV reading is same
for all solutions
Storage cap not removed Remove the storage cap.
Electrical issue Contact a Hach Technical Support Representative.
Slow response time
Contaminated reference junctions
Rinse reference junction with deionized water thoroughly,
shake the electrode downward to remove any air bubbles
and soak in 3.0 M KCl storage solution for 1-2 hours.
Contaminated platinum sensor Clean the electrode.
Electrode not conditioned/pre-treated
for reducing type samples
To significantly reduce the response time for reducing type
samples the platinum disc must undergo the following:
--The platinum disc must be clean and smooth.
--Immerse the platinum disc for 3-10 minutes in Reducing
Solution for ORP Electrodes prior to sample analysis.
--Rinse the electrode with sample, then measure.
Low sample temperature or
temperature difference between
samples.
Check the sample temperature. The lower the
temperature or the greater the difference of temperatures
between samples, traditionally the longer the response
time.
Platinum electrode not conditioned for
reducing-type samples.
The platinum disc must be clean and smooth.
Immerse the platinum disc for 3-10 minutes in Reducing
Solution for ORP Electrodes prior to sample analysis.
Rinse the electrode with sample, then measure.
Out of range
Measure value is outside the
calibration/measurement range of the
electrode.
Recalibrate using freshly prepared standards
Clean the electrode and recalibrate
Verify that the sample is within the range of the electrode
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