Zero point unstable
General Instruction Manual
Troubleshooting
IM 01U10B00-00EN-R, 3rd edition, 2018-07-09
81 / 90
10.2 Zero point unstable
Malfunction
Possible causes
Remedy
Zero point
unstable
Measuring tube not
completely filled with
fluid
–
Check that the measuring tube in the
sensor is completely filled with fluid.
Correct installation, see
[
}
21]
.
Bubbles or solids in
the fluid
–
Check pipe and sensor installation,
see
[
}
27]
.
–
Correct installation, see
[
}
21]
.
No electrical
grounding
–
Ground transmitter and sensor,
see
[
}
44]
, and
[
}
63]
.
–
Check correct connection of connecting
cable shield on transmitter.
Flow meter installed in
proximity to facilities
with strong electro-
magnetic field
–
Ground transmitter and sensor,
see
[
}
44]
, and
[
}
63]
.
–
Install flow meter as far away as possible
from these electric devices.
Mechanical strain
from traction or
pressure
–
Eliminate cause for mechanical tension.
Terminal board or
connection terminals
of transmitter or
sensor soiled or damp
–
Clean terminal board and connection
terminals.
–
Clean transmitter and/or sensor.
–
Dry transmitter and/or sensor.
–
Seal transmitter and/or sensor tightly.
Influence of external
vibration
–
Install mechanical dampers.
–
Increase parameter
mass flow damping
(see applicable software instruction
manual).
