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In case of angular misalignment between transducer 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
FUS380/FUE380
Operating Instructions, 09/2016, A5E00730100-AB
77