Algorithm - Siemens HydroRanger 200 HMI Operating Instructions Manual

Algorithm

The true echo is selected based on the setting for the Echo selection algorithm. For a list
2. 1 1.2.2. Algorithm
of options see
select the true echo.
Below are the preferred algorithm types because they provide the best echo selection
results in most applications. Other algorithms (
produce better results in specialized applications, but they should only be used after
consulting an experienced technical expert.
Algorithm
TF True First echo
L Largest echo
Best of First and
BLF
Largest echo
Area, Largest,
ALF
and First
Distance calculation
To calculate the transducer to material level (object) distance, the transmission medium
(atmosphere) sound velocity (
transmission to reception time period. This result is divided by 2, to calculate the one way
distance.
Distance = Sound Velocity x Time / 2
The Reading displayed is the result of performing any additional modification to the
calculated distance, as determined by any of the following:
2.1.3. Sensor Mode
2.1.1. Units
Volume Conversion
2.7.2. Vessel Shape
2.7.3. Maximum Volume
A5E36281317
on page 160. All algorithms ultimately use confidence to
Echo Determination
Selects the first echo that crosses TVT
curve.
Selects the largest echo above the TVT
curve.
Selects the echo (first and highest) with
the highest confidence value.
Selects the echo with the highest confi-
dence value based on the three criterion
(widest, highest, and first).
2. 1 1.1.2. Sound Velocity
Parameter
HydroRanger 200 HMI – OPERATING INSTRUCTIONS
2.11.2.2. Algorithm
on page 160) may
Suggested Usage
Use in liquids applica-
tions free of obstruc-
tions when confidence
of first echo is high.
Use in long range liq-
uids applications with
large (tall) material
return echoes.
Default and most com-
monly used. Use in all
short to mid range gen-
eral liquids and solids
applications where there
is a relatively large (tall),
sharp echo.
Use in mid to long range
solids applications
where the material
return echo is wide and
large, and where com-
peting smaller echoes
challenge BLF.
) is multiplied by the acoustic
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