10 Troubleshooting
10.2 Measuring point selection
FLUXUS F60*
2017-10-16, UMFLUXUSF60xV5-0EN
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The measuring signal is received but no measured values can be obtained
• An exclamation point (
!
) in the lower line on the right indicates that the defined upper
limit of the flow velocity is exceeded and, therefore, the measured values are marked as
invalid. The limit has to be adapted to the measuring conditions or the check has to be
deactivated.
• If no exclamation point (
!
) is displayed, a measurement at the selected measuring point
is impossible.
Signal loss during the measurement
• If there is no measuring signal after the pipe had been run empty and refilled, contact
FLEXIM.
• Wait a moment until the acoustic contact is reestablished. The measurement can be in-
terrupted due to a temporarily higher proportion of gas bubbles and solids in the fluid.
The measured values substantially differ from the expected values
• Wrong measured values are often caused by wrong parameters. Make sure that the en-
tered parameters are correct for the measuring point.
10.2
Measuring point selection
• Make sure that the recommended min. distance to any disturbance source is observed.
• Avoid measuring points with deposit formation in the pipe.
• Avoid measuring points in the vicinity of deformations and defects on the pipe as well
as welds.
• Make sure the pipe surface at the selected measuring point is even.
• Measure the temperature at the measuring point and make sure that the transducers
are suitable for this temperature.
• Make sure that the outer pipe diameter is within the measuring range of the transducers.
• When measuring on a horizontal pipe, the transducers have to be mounted laterally on
the pipe.
• The measuring point on a vertically mounted pipe has always to be filled. The fluid
should flow upward.
• No gas bubbles should form (even bubble-free fluids can form gas bubbles when the
fluid expands, e.g., upstream of pumps and downstream of great cross-section enlarge-
ments).
10.3
Maximum acoustic contact
see section 6.2