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6 F 8 A 0 5 2 1
No.
Trouble
Too much difference
between measured
5
density and manual
analysis value
Measured density
varies widely and does
6
not agree with manual
analysis value.
Suitable location
7
varies depending on
density.
Output is either
8
unstable or unsuitable.
Table 8.1 Troubleshooting (2)
Cause
Inappropriate density
correction factor setting.
Air accumulates and keep
staying inside the detector.
Or substance being
measured is sediment.
Large quantity of bubbles are
contained in the fluid.
Large quantity of bubbles are
contained in the fluid.
The pipeline where the
detector is installed is not
filled with the substance to
be measured that flows.
Or air remains in the pipeline
where the detector is
installed.
Zero point is off.
The electric conductivity of
the measured matter is too
high.
Converter failure
72
Remedy
Calibrate span as described in
section 6.5.
Very slow flow can be the cause.
Make the flow faster by using
smaller bore detector to prevent air
or substance from remaining in the
detector. If this does not solve the
problem, resort to vertical piping.
Find out where the air is brought
in, and make necessary
adjustments. Keep mixer vanes
under water. Position the pump
inlet low enough. Keep fluid
pressure high (0.1MPa or more is
recommended).
Remedy the locations containing
air bubbles. An example is to
position the blade of the agitator in
the tank below the fluid level.
Another example is to position the
inlet port of the pump sufficiently
below the fluid level.
Take necessary steps to make
the fluid pressure high (0.1MPa or
more is recommended).
It is desirable to install the meter
on the discharge port of the pump.
At the same time, make sure that
the meter is placed as far as
possible (closer to the pump) from
the pipe outlet for air release.
Keep the tube always filled up with
fluid by closing the downstream
valve slightly or add a relief valve.
Installing the density meter on the
outlet side of the pump can help
eliminate the cause of those
troubles. Vertical piping is
recommended for filling the pipe.
Calibrate zero point as described
in Section 6. 4, then calibrate
span described in Section 6.5
Check if the electric conductivity
is within the specified range.
If the electric conductivity is
beyond the range, send its
measurement results and
self-diagnosis data to our Service
Department.
Send self-diagnosis data to our
Service Department.
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