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FC7x0
Troubleshooting
16.2 Zero point unstable
Tab. 41: Different kinds of malfunction for zero point unstable: causes ans remedies
Malfunction
Zero point
unstable
16.3 Display deviating
Tab. 42: Different kinds of malfunction for display deviating: causes ans remedies
Malfunction
Flow rate
displayed deviates
from actual flow
rate
144 / 180
Possible causes
Measuring tube not
completely filled with
fluid
Bubbles or solids in
the fluid
No electrical
grounding
Flow meter installed in
proximity to facilities
with strong electro-
magnetic field
Mechanical strain
from traction or
pressure
Terminal board or
connection terminals
of transmitter or
sensor soiled or damp
Influence of external
vibration
Possible causes
Zero point set
incorrectly
Highest and lowest
value for mass flow
set incorrectly
Measuring tubes not
completely filled with
fluid
Bubbles in fluid
Connecting cable
incorrectly connected
for remote type
A5E52748387-AA, 2023/09
Remedy
– Check that the measuring tube in the
sensor is completely filled with fluid.
Correct installation, see Installation
instructions.
– Check pipe and sensor installation, see
Sensor installation.
– Correct installation, see Installation
instructions.
– Ground transmitter and sensor, see
[} 106], and [} 124].
– Check correct connection of connecting
cable shield on transmitter.
– Ground transmitter and sensor, see
[} 106], and [} 124].
– Install flow meter as far away as possible
from these electric devices.
– Eliminate cause for mechanical tension.
– Clean terminal board and connection
terminals.
– Clean transmitter and/or sensor.
– Dry transmitter and/or sensor.
– Seal transmitter and/or sensor tightly.
– Install mechanical dampers.
– Increase parameter mass flow damping
(see applicable Function Manual).
Remedy
– Set zero point, see [} 134]
– Match settings of flow meter and reading
system.
– Check LRV and URV process
parameters, see Function Manual.
– Correct installation, see [} 90]
– Check pipe and installation, see [} 90].
– Correct installation, see [} 90]
– Check cable connections and correct, if
necessary, see [} 108].
Zero point unstable
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