VEGA VEGAPULS 45 4 … 20 mA; HART compact sensor - Manual (Page 46)

46 VEGAPULS 42, 44 and 45 – 4 … 20 mA
with
medium
Min.
adjust
at %
XXX.X
Max.
adjust
at %
XXX.X
Signal
condit
ioning
Scal
ing
0 %
corres
ponds
XXXX
100 %
corres
ponds
XXXX
Deci-
mal
point
888.8
prop.
to
Mass
Unit
Kg
Adjustment with medium
Fill the vessel e.g. to 10 % and enter 10 % in
the menu "
Min. adjust“ with the "+“ and "–“
keys. Then fill the vessel, e.g. to 80 % or
100 % and enter 80 % or 100 % in the menu
"
Max. adjust“ with the "+“ and "–“ keys.
4. Conditioning
Under the menu item " Conditioning“, you
assign a product distance at 0 % and at 100
% filling. Then, you enter the parameter and
the physical unit as well as the decimal point.
Enter in the menu window " 0 % corresponds“
the numerical value of the 0 % filling. In the
example of the adjustment with the PC and
the adjustment software VVO, this would be
45 for 45 liters.
• Confirm with " OK“.
With the "—>“ key you switch to the 100 %
menu. Enter here the numerical value of your
parameter corresponding to a 100 % filling.
In the example 1200 for 1200 liters.
With the " +“ or "–“ key you can
assign a level distance (ex-
ample 5.85 m) to the previ-
ously adjusted percentage
value. If you do not know the
distance, you have to do a
sounding.
The adjusted product dis-
tance is written in the sensor
and the display stops flash-
ing.
You thereby adjusted the lower product dis-
tance as well as the percentage filling value
corresponding to the lower product distance.
Note:
For level detection outside the operating range,
the operating range must be corrected accord-
ingly in the menu "
Sensor optimisation/Operat-
ing range“.
OK
+ –
or
100.0%
at
m (d)
XX.XXX
(max. adjustment)
Now you make the max. adjustment (upper
product distance) (example: 100 % and
1.270 m product distance). First, enter the
percentage value and then the product dis-
tance corresponding to that percentage value.
Note:
The difference between the adjustment val-
ues of the lower product distance and the
upper product distance should be as big as
possible, preferably at 0 % and 100 %. If the
values are very close together, e.g. lower
product distance at 40 % (3.102 m) and
upper product distance at 45 % (3.331 m),
the measurement will be less accurate. A
characteristic curve is generated from the
two points. Even the smallest deviations
between actual product distance and en-
tered product distance will considerably
influence the slope of the characteristic
curve. If the adjustment points are too close
together, small errors inflate to considerably
larger ones when the 0 % or the 100 % value
is outputted.
Set-up