Dwyer PSX2 User Manual
Page 157
148
State
Cause
Remedy
Air bubbles have entered.
In case measurement is normal
with water fl ow stopped, entrance
of air bubbles is the cause of this
error.
When the sensor is mounted just
after a valve, cavitation will occur
to cause the same effect as
entrance of air bubbles.
Ö
Eliminate entrance of air
bubbles.
• Raise the level of pump well.
• Confi rm the shaft seal of
pump.
• Retighten the fl ange of nega-
tive pressure piping.
• Prevent fl uid from rushing
into pump well.
Move the sensor to the loca-
tion where air bubbles have not
entered.
• To the inlet side of pump
• To the upstream side of valve
Turbidity is high.
Turbidity is higher than those of
sewage and return sludge.
Ö
• Change the sensor mounting
method from V to Z.
• Move the sensor to the loca-
tion on the same line, where
the outer diameter of pipe is
smaller.
• Move to a different place or
different pipe.
• Raise the voltage for trans-
mission (refer to p.21).
Because of an old pipe, scale has
stuck to the inside.
Ö
Lining is thick.
Because of mortar lining or the
like, thickness is a few ten mm or
more.
Ц
Ш
Lining is peeled.
Try measurement with the
optional large size sensor.
Ö
Contact Manufacturer.
There is a gap between lining and
piping.
Sensor is mounted at a bent pipe or
tapered pipe.
Ö
Mount to a straight pipe.
3. Infl uence by external noise
• There is a radio broadcasting sta-
tion in the vicinity.
• Measurement has been conducted
near heavy traffi c.
Ö
• Minimize the cable between
main unit and sensors.
• Sensor mounting is incomplete.
• Mounting dimension is
improper.
• Sensor is not in contact with
pipe.
Ö
Mount the sensors in parallel
with the pipe following the cor-
rect mounting dimension.
Bring the sensor in close con-
tact with the pipe.
4. Hardware error
Ö
Contact Manufacturer.
Bulletin F-9-PUX2