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MA300TS-0210
7. Troubleshooting
If you suspect any malfunction or trouble, always perform the following confirmation and remedy before requesting repairs.
If the symptoms do not subside, contact the dealer from which you purchased the product.
Symptom
Confirmation
Action
The value is high.
The value does not change
(does not lower).
Was air inadvertently suctioned
during the measurement?
Dispose of the sample solution being
measured, and start the measurement from the
beginning.
Was the span calibrated?
Calibrate the span. (Refer to pages 9 to 10.)
Was the membrane on the tip of
the oxygen sensor facing
upward when calibrating the
span?
Point the membrane on the tip of the oxygen
sensor downward or to the side when
calibrating the span.
Is the oxygen sensor being used
after being suspended for a long
time (several months)?
The oxygen sensor membrane and electrolytic
solution may be degraded. Replace the
membrane and electrolytic solution with new
ones. After replacing, allow the sensor to
stabilize for several hours to 12 hours or more,
and then calibrate it.
Is the membrane on the top of
the oxygen sensor
contaminated?
Clean the oxygen sensor and remove the
contaminants. (Refer to section “6.
Maintenance (1) Cleaning after measurement”
on page 16.)
If the contaminants cannot be removed,
replace the membrane and electrolytic solution
with new ones. After replacing, allow the sensor
to stabilize for several hours to 12 hours or
more, and then calibrate it.
Was zero calibration performed? Perform zero calibration. (Refer to page 11.)
Use zero standard solution (zero water) that
has been prepared just before the calibration,
not solution made in advance.
If the symptoms do not improve
after taking the above actions,
the oxygen sensor may have
reached its life.
Order a new oxygen sensor and replace the old
one.
The value is low.
Is the stirrer creating an
appropriate flow?
The measurement value can be low if the stirrer
speed is too low, causing the flow to be
insufficient. Adjust the speed to the maximum
speed that does not cause the magnetic stir bar
to pop off. (Refer to page 14.)
Was the span calibrated?
Calibrate the span. (Refer to pages 9 to 10.)
Was the membrane on the tip of
the oxygen sensor facing
upward when calibrating the
span?
Point the membrane on the tip of the oxygen
sensor downward or to the side when
calibrating the span.
