Hach-Lange ISENO318103 User Manual - 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 Clean the probe
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
Check probe response
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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