Hach-Lange ISENO318103 User Manual User Manual
Page 11
Message or symptom
Possible cause
Action
Connect a probe or probe
requires service
Probe not connected properly
Disconnect, then connect the probe. Tighten the
locking nut.
Software not updated
To download the most current version of the
software, refer to the applicable product page on the
manufacturer's website.
Refer to the HQd Series meter manual.
Large number of methods stored on
probe.
Continue to let probe connect. Do not disconnect
probe.
Damaged probe
Make sure connectivity with another electrode or
meter to confirm isolated issue with probe. Contact a
Technical Support Representative.
mV reading is the same for all
solutions
Electrical issue
Contact a Technical Support Representative.
Slow response time
Dirty sensing element
Clean the probe (refer to
on page 10).
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.
Bubbles trapped under sensor tip
Gently shake the probe until bubbles are removed
from under sensor tip.
Slope out of range (refer to
on page 13)
pH is incorrect
Make sure the pH is between 3 and 5 after each ISA
addition.
Ionic strength adjustor (ISA) not
used
Add ISA to each sample and standard (one powder
pillow per 25 mL of solution).
Insufficient conditioning
Condition for at least 30 minutes in a 100 mg/L
standard solution with ISA.
Damaged probe
Contact a Technical Support Representative.
Incorrect standards
Calibrate using freshly prepared standards.
Dirty sensing element
Clean the probe and recalibrate.
Bubbles trapped under sensor tip
Gently shake the probe until bubbles are removed
from under sensor tip.
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