Siemens SITRANS FUP101 Mode D'emploi page 34

Troubleshooting
4.1 Troubleshooting
Error or Message
Re-space Index
Invalid Setup (use
Direct Mode)
Low Signal - Press
<ENTER>
Detection Fault
32
Probable Cause
The measured liquid sonic velocity (Vs) is
more than +/- 25% of the average Vs range.
During the Initial Makeup the system
detects invalid Sensor spacing, erroneous
liquid or pipe parameters, or some other
factor that prevents it from completing the
Initial Makeup.
During the Initial Makeup the flow meter
decides that the level of the receive signal is
insufficient for proper operation.
If it appears that the flow meter cannot
complete an Initial Makeup it means that the
pipe and/or liquid conditions do not permit a
receive signal that meets the flow detection
standards. The system will not operate.
Solution
Ensure proper pipe dimensions and/or Liquid

data entries are correct.
Properly enter correct Sensor Size into the

meter [Install Sensor] menu.
Confirm sensor spacing is correct by checking

[Install Sensor] menu spacing parameters.
This may be due to one of the following:
An out-of-range data entry.

An invalid condition (e.g., overlapping Sensors

in Reflect Mode). If selecting Direct Mode does
not resolve, review all site setup and Sensor
installation choices; particularly data entered
for pipe and liquid.
In Reflect Mode the flow meter detects that the

pipe wall signal may impinge upon the liquid
signal. Use Direct Mode instead.
Press <ENTER>, <Up Arrow>, <Down Arrow>,

or <Left Arrow> to abort install routine.
Continue programming other site data in
anticipation of resolving the difficulty later. Call
technical support for help if necessary.
Some reasons for low signal are:
Invoking [Install Complete?] on an empty pipe.

Coupling compound insufficient; not applied or

evaporated. Reapply couplant.
A disconnected or broken Sensor cable.

The pipe needs to be conditioned at the

mounting location.
Flush out large air bubbles.

The Sensor cables are defective or not

connected to the correct channel.
The Set Empty routine performed when pipe

was NOT actually empty.
If you locate and correct the improper condition
immediately, press <ENTER> to resume the
installation procedure. Otherwise, press the <Left
Arrow> to abort the installation and conduct a
thorough investigation.
Attempt to improve operating conditions 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 or pipe wall sonic
conductivity.
FUP1010 IP67 Portable Quick Start
Operating Instructions, 01/2013, CQO:QSG003 Revision 05