VEGA VEGASON 54K…56K - Manual (Page 43)

VEGASON 54K … 56K 43
Set-up - Adjustment with the adjustment module MINICOM
Ampl.:
XX dB
S-N:
XX dB
With the "—>“ key you change to the 100 %
menu. Enter here the value of your parameter
corresponding to a 100 % filling. In the exam-
ple 1200 for 1200 liters.
• Confirm with " OK“.
If necessary, choose a decimal point. How-
ever, note that only max. 4 digits can be
displayed. In the menu "
prop. to“ you choose
the parameter (mass, volume, distance…)
and in the menu "
Unit“ the physical unit (kg, l,
ft 3 , gal, m 3 …).
Linearisation:
A linear correlation between the percentage
value of the product distance and percent-
age value of the filling volume is preadjusted.
With the menu "Lin. curve“ you can choose
between linear, spherical tank and cylindrical
tank. The creation of a customised
linearisation curve is only possible with the
PC and the adjustment program VVO.
5. Meas. conditions
(see menu diagram page 64)
6. False echo storage
A false echo storage is always useful when
unavoidable false echo sources (e.g. struts)
must be minimised. By creating a false echo
memory, you authorise the sensor electronics
to note the false echoes and save them in an
internal database. The sensor electronics
treats these (false) echoes differently from
the useful echoes and filters them out.
7. Useful level and noise level
In the menu
you get important information on the signal
quality of the product echo. The higher the
"S-N“ value, the more reliable the measure-
ment (menu diagram MINICOM).
Ampl.: means amplitude of the level echo in
dB (useful level)
S-N: means Signal-Noise, i.e. the useful
level minus the level of the back-
ground noise
The bigger the "S-N“ value (difference be-
tween the amplitude useful level and the
noise level), the better the measurement:
> 50 dB
Measurement excellent
40 … 50 dB Measurement very good
20 … 40 dB Measurement good
10 … 20 dB Measurement satisfactory
5 … 10 dB Measurement sufficient
< 5 dB Measurement poor
Example:
Ampl. = 68 dB
S-N = 53 dB
68 dB – 53 dB = 15 dB noise level
53 dB signal level difference indicates very
high measurement reliability.
8. Outputs
Under the menu "Outputs“ you determine, if
for example, the current output should be
inverted, or which parameter should be
shown on the sensor display.
Lin.
curve
Linear
Integr
ation
time
0 s
Adjust
ment Signal
condit
ioning
Scal
ing