horiba U-51, Инструкция по эксплуатации

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4 Maintenance
96
4.7.2 Error displays in sensor information
Sample is unstable.
1. The concentration of the sample is
unstable.
2. External light disturbance has affected the
sensor.
3. Water has entered the turbidity sensor's
connector.
1. Use a stirrer to agitate the sample during
measurement.
2. Perform measurement away from direct
sunlight.
3. Turn the power OFF, wipe off any water
droplets on the probe, then remove the turbidity
sensor. Check there are no water droplets around
the turbidity sensor connector, then mount the
sensor again. If the error persists, replace the
turbidity sensor.
Error Cause Solution
Error display Cause Solution
Measurement
sequence error
Measurement sequence error
Turn the power OFF, then restart the system. If the
error persists, have the probe repaired.
Out of
measurement
range
The measurement value is outside the
measurement range. Samples for measurement must be within the
measurement range.
Last calibration
invalid
The last calibration failed. Redo calibration.
Calibration
invalid The calibration value is the factory
default value.
Redo calibration.
Background
unstable
The U-53 turbidity sensor is exposed to
direct light. Mount the guard cap and sensor guard and perform
measurement away from direct sunlight.
The turbidity value changed rapidly
during measurement.
Measure a sample that has stable turbidity.