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No.
Trouble
Too much difference
5
between measured density
and manual analysis value
Measured density varies
6
widely and does not agree
with manual analysis value.
Suitable location varies
7
depending on density.
Output is either unstable or
8
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 tank or the piping system (where
the density meter is installed) is not
flowing filled with substance to be
measured. Or bubbles stay in the tank
or the piping system (where the
density meter is installed).
Zero point is off.
The electric conductivity of the measured
matter is too high.
Converter failure
71
6 F 8 A 0 7 8 7
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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