Siemens SITRANS F FUH1010 Series Operating Instructions Manual page 9

Errata
Error or Message
Low Signal - Press <ENTER>
Detection Fault
Siemens Hardware
Probable Cause
During the Initial Makeup the flow
meter decides that a level of the re-
ceive signal is insufficient for proper
operation.
If it appears that the flow meter can
not complete an Initial Makeup this
means that the pipe and/or liquid con-
ditions do not permit a recieve signal
that meets the flow detection stan-
dards.
The system will not operate.
E-3
1010FMA-61
Solution
Some reasons for low signal are:
•
Invoking [Install Complete?] on
an empty pipe.
•
Coupling compound insufficient,
not applied or evaporated. Reap-
ply couplant.
•
A disconnected or broken sen-
sor cable.
•
The pipe needs to be condi-
tioned at the mounting location.
•
Flush out large air bubbles.
•
The sensor cables are defec-
tive or not connected to the cor-
rect channel.
•
The Set Empty routine per-
formed when pipe was NOT ac-
tually empty.
•
If you locate and correct the im-
proper condition immediately trig-
ger <ENTER> to resume the in-
stallation procedure. Otherwise,
trigger the <Left Arrow> to abort
the installation and conduct a thor-
ough investigation.
Attempt to improve operating con-
ditions by reinstalling the sensors
at a different spacing offset, or
even at a different location on the
pipe.
Switching from Reflect to Direct
Mount may solve the problem.
However, operation may not be
possible if there is poor liquid, pipe
wall sonic conductivity or extreme
liquid aeration.