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Troubleshooting
67
Troubleshooting
Problems with measurement
Symptom
Possible cause
Remedial action
Fluctuation in
measured value
Non-uniformity of sample water
Run zero water and check for variations.
Pour in the turbidity standard solution, and check its
difference from the sample water.
Increase the numerical value of the damping factor, and
check for variations.
The sample water’s particle size is
large and it subsides easily
Stir the sample water.
The average movement count is low
Change dF (moving average count) to a larger value.
Measured value is
high
The sensor is clogged with debris
Remove any solids.
The automatic cleaner wiper remains
in the optical path
Contact HORIBA Advanced Techno.
Condensation forms on the cell
Replace the desiccant.
Measured value is
negative (during
zero calibration)
Drift of instruments
Zero calibration can be performed with no problem with
values around
0.05.
The previous calibration was not
performed properly
Perform zero calibration with clean water.
Measured value
does not vary
Commands are in a hold state
Cancel the hold mode to set operation to the meas mode.
The cell is empty
Supply the sample water.
Value of zero
water is high
during calibration
The detector is soiled
Remove any dirt from the detector.
The detector is faulty
Contact us.
Abnormal
operation
Substrate operation error
The blinking LED can be checked through the peephole.
The light source is not lit
Contact us.
Measured value
decreases after
automatic zero
calibration (option)
Zero calibration is performed with a
high turbidity
Decrease the stability level or lengthen the stability time.
Correct the value by manually performing zero
calibration.
Automatic
calibration error
occurs
Zero water measurement cannot be
stabilized due to contaminated
piping, etc.
Specify a shorter stability time.
Power is not
turned ON
The power supply voltage is outside
the rated voltage range
Check the power supply voltage.
Wiring error
Check the power distribution line.
Internal error of the converter
Contact HORIBA Advanced Techno.