In case of angular misalignment between sensor faces, the gain step will increase as shown in
the table below:
Angular misalignment Gain step increase
2° 1
3° 2
4° 3
5° 5
Flow velocity error conditions
Condition Cause
Δ flow velocity values (between path 1 and path 2)
> 1
(2-path systems only)
● Bad inlet conditions (the higher the delta, the
worse the inlet conditions)
● Disturbances in the pipe (bad flow profile)
Unstable/fluctuating values
● Air bubbles or solids in media
● Bad inlet conditions
The actual velocities for the paths should be stable, constant and smoothly changing values
between 0 and 10 m/s.
Troubleshooting/FAQs
9.2 Diagnosing with PDM
SITRANS FUS380/FUE380
Operating Instructions, 05/2018, A5E00730100-AE 85
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