VEGA VEGAPULS 56V - Manual (Page 65)

VEGAPULS 56V 65
Ampl.:
XX dB
S-N:
XX dB
Lin.
curve
Linear
Integr
ation
time
0 s
Adjust-
ment Signal
condit
ioning
Sca-
ling
Linearisation:
Pre-adjusted is a linear dependence be-
tween percentage value of the product dis-
tance and the percentage value of the filling
volume.
With the menu "Lin.curve“ you can choose
between linear, spherical tank and cylindrical
tank and user programmable. The adjust-
ment of a user programmable linearisation
curve is only possible with the PC and the
adjustment program VVO.
7 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 (menu plan page 66).
8) False echo storage
A false echo storage is only useful when false
echo sources such as e.g. struts must be
reduced if not possible in another way (cor-
rection of the installation position). With the
creation of a false echo storage you cause
the sensor electronics to learn the false ech-
oes and to save them in an internal database.
The sensor electronics treats these (false)
echoes different than the useful echo and
gates them out (menu plan page 72).
9) Useful and noise level
In the menu
you receive important information on the
signal quality of the product echo. The higher
the amount out of "
S-N“-value, the more reli-
able the measurement (menu plan page 72).
Ampl.: Means amplitude of the product echo
in dB (useful level)
S-N: Means Signal-Noise, i.e. the useful
level minus the level of the back-
ground noise
The larger the S-N-value (distance of the
amplitude useful level to noise level), the
better your measurement:
> 50 dB
Measurement very good
40 … 50 dB Measurement good
20 … 40 dB Measurement satisfactory
10 … 20 dB Measurement sufficient
5 … 10 dB Measurement bad
< 5 dB Measurement very bad
Example:
Ampl. = 68 dB
S-N = 53 dB
This means that the noise level is only
68 dB – 53 dB = 15 dB.
53!dB signal distance mean a good reliability.
10) Adjustment/Conditioning/Outputs of
the sensor display
The menu points " Adjustment“, "Conditioning“
and " Outputs“ in the MINICOM-menu relate
only to the sensor display. All adjustments
carried out here, only relate to the sensor
display or to the external indication. The
measured value processing is not concerned
(menu plan page 72).
Set-up