VEGA VEGAPULS 45 VBUS - Manual (Page 50)

50 VEGAPULS 42, 44 and 45 – VBUS
Adjustment with the PC on the signal conditioning instrument
In the example, the 0 % filling is at a product
distance of 5.85 m and the 100 % filling at a
product distance of 1.27 m.
Note:
The sensor can only detect levels within the
defined operating range. To enable detection
of levels outside the operating range, it is
necessary to correct the operating range in
the menu "
Sensor optimisation/Meas. environ-
ment".
• Confirm your adjustments with
"OK" and
you are again in the menu window " Adjust-
ment".
• Click in the menu window " Adjustment" to
"
Quit".
You are again in the menu window " Instru-
ment data parameter adjustment".
Now, the sensor electronics has two charac-
teristics points, one for min. and one for max.,
with which a linear correlation between prod-
uct distance and percentage filling of a ves-
sel can be generated.
Of course, the characteristics points do not
have to be at 0 % and 100 %, however the
distance should be as great as possible
(e.g. at 20 % and at 80 %). The difference
between the characteristics points for the
min./max. adjustment should be at least 50
mm product distance. This is a theoretical
value, because if the characteristics points
are too close together, the likelihood of meas-
uring error increases. Ideal would be to carry
out the adjustment as shown in the example,
at 0 % and at 100 %.
In the menu " Instrument data/Parameter ad-
justment/Conditioning/Linearisation" you can
enter later, if necessary, a correlation be-
tween product distance and percent value of
volume other than linear (see later subitem
"Linearisation”).
Scaling
• Click in the menu window " Instrument data
parameter adjustment" to "
Conditioning".
The menu window " Conditioning" opens.
• Click to "
Scaling".
In the menu " Scaling" you enter the actual
0 % and 100 % values of the parameter and
their unit. You thereby inform the sensor, e.g.
that at 0 % filling there are still 45 liters and at
100 % filling 1200 liters in the vessel. The
sensor display then shows with empty vessel
(0 %) 45 liters and with full vessel (100 %)
1200 liters.