VEGA VEGAPULS 51V…54V - Manual (Page 67)

VEGAPULS 51 V … 54 V 67
8.) Useful and noise level
In the menu
you get an important information on the signal
quality of the product echo.
The higher the amount out of "
Ampl." minus
" S-N", the more reliable is the measurement.
Ampl.: Means amplitude of the level echo
in dB (useful level)
S-N: Means Signal-Noise, i.e. the level of
the background noise (noise level)
The larger the distance of the amplitude
(Ampl.) to the noise level (S-N), the better is
your measurement:
> 18 dB
Meeasurement very good
18 … 13 dB Measurement good
13 … 8 dB Measurement satisfactory
8 … 5 dB Measurement sufficient
< 5 dB Measurement very bad
Example:
Ampl. = 68 dB S-N = 53 dB
68 dB – 53 dB = 15 dB
With 15 dB signal distance there is a high
reliability.
9. Conditioning / Scaling of the sensor
display
The menu point "Conditioning" in the
MINICOM-menu only relates to the
SENSOR-display and will be overwritten by
the adjustments in the signal conditioning
instrument.
Menu plan page 74
Ampl.:
XX dB
S-N:
XX dB
Set-up - Adjustment with MINICOM or VEGAMET
Linearisation:
A linear dependence between the
percentage value of the level distance and
the percentage value of the filling volume is
preadjusted.
You can choose in the menu "Lin.curve"
between linear, cylindrical tank and spherical
tank. The adjustment of an own linearisation
curve is only possible with the PC and the
adjustment program VVO (see page 52).
6. Outputs
Under the menu " Outputs" you determine if
e.g. the current output should be inverted or
which parameter should be provided by the
sensor indication.
7.) False echo memory
A false echo memory is always useful when
false echo sources such as e.g. struts must
be reduced. With the creation of a false echo
memory you cause the sensor electronics to
note the false echoes and to save them in an
internal database. The sensor electronics
treats these (false) echoes differently than
the useful echo and gates them out.
Lin.
curve
linear
Integr
ation
time
0 s
Ad-
justment Signal
conditi
oning
Scaling