Siemens FUS1010 Operating Instructions Manual page 151

Functions
7.14 Reflexor
Display of "F" at No-Flow conditions
It is normal for the digital display to show an "F" for the no flow condition since the lack of
Spectra information during no flow is the same as a fault condition.
Note
Selecting the [Operation Adjust] menu cell [Zero/Fault Set] allows the option of indicating
Zero Flow rather than a Fault.
Selecting Liquid Composition
The width of the Spectra wave shape is an indication of the depth of penetration of sonic
energy into the flow stream. The % Deviation is a measure of the width of the Spectra and is
representative of the penetration of the sonic beam into the liquid.
Select [Slurry] in the [Application Data] menu for better flow rate indication accuracy when
the % Deviation is less than 25 with typical flow conditions.
For % Deviations above 35, select [Liquid]. For applications that continuously have %
Deviations between 25 and 35, proper selection of either [Liquid] or [Slurry] can be confirmed
by comparison to a known flow reference.
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FUS1010 IP65 NEMA 4X & IP66 NEMA 7
Operating Instructions, 01/2013, A5E02951520-AC