VEGA VEGASCAN 850 - Manual (Page 69)

VEGASCAN 850 69
Setup - Adjustment with the PC
You can carry out the min./max. adjustment
"with medium“ (adjustment by means of the
actual level) or
"without medium“ (without
taking the actual level into consideration, i.e.
with empty vessel).
Generally, you will carry out the adjustment
without medium. Then you are not concerned
about the actual vessel filling during adjust-
ment. When you want to carry out the adjust-
ment with medium, you have to carry out the
min. adjustment with emptied (also partly
emptied) vessel and the max. adjustment
with filled (also partly filled) vessel. It is con-
venient and quick to carry out the adjustment
without medium, as shown in the example.
• Choose "
no (adjustment without medium)“.
• Choose if you want the carry out the ad-
justment in meters (m) or in feet (ft).
• Enter a distance for the upper and lower
level and the volume in % corresponding to
each distance.
In the example, the 0 % filling is at a product
distance of 3.400 m and the 100 % filling at a
product distance of 0.500 m.
Note:
The instrument is supplied with the operating
range identical to the sensor measuring
range. After sensor adjustment, the operating
range corresponds to the adjustment. The
sensor can only detect levels within the de-
fined operating range. For the detection of
levels outside the operating range, e.g. new
adjustment, it is necessary to correct the
operating range in the menu "
Sensor optimi-
sation/Meas. environment“
• 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.,
out of which a linear correlation between
product distance and the percentage filling of
a vessel is generated.
Naturally the characteristics point must not
be at 0 % and 100 %, however the distance
should be as big as possible (e.g. at 20 %
and at 80 %). The difference between the
characteristics points for the min./max. ad-
justment should be at least 20 mm product
distance. This is a theoretical value, because
if the characteristics points are too close
together, the possible measuring error in-
creases. Ideal would be, to carry out the
adjustment as shown in the example, at 0 %
and at 100 %.