Troubleshooting
109
The measured value is too
low.
The water filter is noticeably dirty.
Replace the water filter (refer to "Replacing the
water filter" (page 99)).
The sample water was measured
after calibration with solvent only.
Calibrate using the same extraction conditions as
for measurement.
A sudden change of room
temperature or liquid temperature
occurred.
Use a thermometer to monitor the room
temperature and keep the room temperature
constant during measurement.
When using tap water, place in a 1 L to 2 L
container a few hours prior to measurement so
that the liquid temperature is approximately the
same as the room temperature.
Measurement of low-concentration samples is
particularly susceptible to changes of room
temperature and liquid temperature. The effect of
liquid temperature is greater than the effect of
room temperature.
"UNDER" is displayed
instead of the measured
value.
The detected concentration of the
measurement liquid is
−
20 mg/L or
less.
Refer to the causes and actions for "The
measured value is too low." and "The measured
value is negative." above.
The measurement cell is not filled
with the solvent.
Wait for a while in the semi-automatic or manual
measurement mode.
If "UNDER" is still displayed after a while, replace
the water filter (refer to "Replacing the water
filter" (page 99)).
The measured value is too
high.
The solvent contains more water than
usual due to the effects of emulsifying
substances.
Perform extraction outside of the product,
remove water from the solvent layer, and use the
result as the measurement liquid (refer to
"Examples of measurement by extraction outside
the product" (page 48)).
Water has entered the measurement
cell.
Dry the measurement cell referring to "Drying the
measurement cell" (page 102).
"OVER" is displayed instead
of the measured value.
The detected concentration of the
measurement liquid is 220 mg/L or
more.
Refer to the causes and actions for "The
measured value is too high." above.
The measurement cell is not filled
with the solvent.
Wait for a while in the semi-automatic or manual
measurement mode.
The measured value is
different than expected.
The amount of sample water or
solvent is incorrect.
Measure using 16 mL of sample water and 8 mL
of solvent.
Incorrect calibration liquid
concentration.
Perform zero calibration and span calibration
again using the correct concentration of
calibration liquid.
The solvent used for calibration is
different from the solvent used for
measurement.
Perform zero calibration, span calibration, and
measurement again using the same solvent.
Insufficient liquid in the measurement
cell.
Replace the water filter (refer to "Replacing the
water filter" (page 99)).
The ambient temperature is outside
the operating temperature range.
Perform measurement in a location where the
ambient temperature range is 0°C to 40°C.
The numbers of purges are too low.
Increase the numbers of purges.
The span liquid concentration is too
low.
Use the span liquid of 10 mg/L or higher
concentration.
Problem
Cause
Action
