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11. Error message and troubleshooting
Failure Status
The water flow
rate is abnormally
displayed. The
signal is violently
changed.
The value is
incorrect ①
The value is
incorrect②
The transducer is
under normal
conditions, but the
flow rate is low or
the water is not
flowing.
Cause of failure
The transducer is installed at the
position subjecting to stronger
pipeline vibration or causing the
change of flowing direction. In
other words, the position
presents an unstable flow field.
If installing the transducer at the
top or the bottom of the
horizontal pipeline, then the
bubbles of the top of the
sediment at the bottom will affect
the value of the ultrasonic wave.
It is caused by installing the
transducer on the pipeline
section subjecting to downward
flowing and lower liquid level
status.
The position subjecting to visible
flowing fluctuation such as the
Venturi nozzle, pipeline
connection area and the position
adjacent to the front and rear
ends of the equipment cause
incorrect values.
The pipeline diameter
parameters received from the
flow meter are inconsistent.
The paint or the rust remained
on the transducer and the
pipeline is not removed.
The concentricity of the pipe is
incomplete, and the pipeline
surface is uneven or is being
installed at the welding area.
Serious scum has accumulated
on the pipeline lining (such
defect is easily caused to the
cast iron pipeline).
Solution
Install the transducer at the
location without a vibration
source or the straight pipeline
section where the liquid is
flowing steadily.
By installing the transducer at
±45° within the optimal
installation scope, the lower
liquid level of the pipeline can
be avoided effectively.
Change the installation position
and install it at the upward-
flowing pipeline section.
Such an issue can be avoided
by installing the transducer on
the position along the straight
pipeline section.
Change the incorrect
parameters until the values are
consistent.
Execute the grinding and
cleaning again and then
change the coupling agent.
Execute the grinding again until
smooth and avoid the welding
area.
Select the seamless steel
pipeline presenting a smoother
internal and external surface or
the lower side without being
provided with the lining.
26
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