Hach-Lange PHC10115 User Manual User Manual
Page 12
Message or symptom
Possible cause
Action
Drifting/Inaccurate readings
Contaminated glass sensor
on page 9).
CO
2
absorption (for low ionic
strength or high purity sample)
Use the LIS chamber for LIS/high purity samples to keep
sample contamination from occuring.
Air bubbles around inner
reference electrode
Rinse the reference junction holes with deionized water
and then gently tap the probe with hand or shake the
probe to remove any air bubbles.
Incorrect storage conditions
(discolored, contaminated or
dried gel)
Clean or condition the probe and do recalibration. The
probe may not operate correctly if the probe has been left
dry for a long time. Condition the glass sensor and
reference junctions again:
1.
Soak the probe tip in the 4.01, 7.00 and 10.01 buffers
each for 5 minutes.
2.
Rinse with deionized water. Blot dry with a lint-free
cloth.
3.
Calibrate the probe.
Electromagnetic Forces (EMF)
such as voltaic cells,
thermoelectric devices, eletrical
generators, resistors and
transformers.
Do not test in areas where EMF is present. For testing in
process units (i.e. spot checking), make sure the
equipment is grounded.
Out of range
Measurement value is outside of
range
Make sure that the sample is within the range of the
probe.
Temperature out of range
Temperature value is outside of
range
Make sure that the sample temperature is within the range
of the probe.
Make sure that the temperature sensor is working
correctly.
Measured pH buffer temperature
is outside range of the probe
Make sure that the standard temperature is within the
range of the probe.
Make sure that the temperature sensor is working
correctly.
Check standard temperature
value is outside of range
Make sure that the Check Standard temperature is within
the range of the probe.
Out of limits
Measurement value is outside of
measurement limits set in the
current method
Make sure that the sample is within the limits of the
current method.
Create a new method with expanded limits.
Check standard value is outside
of limits set in the current method
Make sure that the check standard is within the limits of
the current method.
Create another method that expands the acceptable limits.
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Hach Company/Hach Lange GmbH, 2010, 2013. All rights reserved. Printed in U.S.A.
05/2013, Edition 2