Conditioning; Scaling - Vega EL 11 Operating Instructions Manual

Set-up
When you know already the electrode
capacitance of a second similar measurement
loop (same electrode, same installation
conditions, same medium) you can also carry
out the dry adjustment in pF.
First carry out an offset correction with
uncovered electrode (only with adjustment in m:
Instrument data - Parameter adjustment - Addi-
tional functions ).
Move to function Adjustment without medium .
You can choose if you want to carry out the
adjustment in pF or in m. When you have
chosen the adjustment in m, you have to enter
whether your medium is conductive or non-
conductive. When the medium is non-
conductive you must additionally enter the
dielectric constant figure.
In the previous table you can see which criteria
are valid for the conductivity with the capacitive
measurement and if you have to choose
Conductive or Non-conductive.
When you have chosen m, you can coordinate
to the current or percentage values an
appropriate value in metres.
Example
0% = 4,00 mA
100 % = 20,00 mA
When you have chosen pF, you can coordinate
to the current or percentage values an
appropriate value in pico-farad
Example
0% = 4,00 mA
100 % = 20,00 mA = 1428,0 pF
When you push the button OK , the values are
taken over for adjustment.
Capacitive electrodes EL 4 ... 20 mA - compact
= 0,2 m
= 3,2 m
= 97,2 pF

Conditioning

In this window the following functions are
available:

- scaling

- linearisation
- integration time
Scaling
With this command you can scale the
measured value for your indication.
You can choose out of 16 volume, height and
mass units or just dimensionless.
The indication values can be between -10000
and +10000.
Linearisation
In this window you can linearize unlinear
vessels such as e.g. cylindrical tanks.
The following linearisation curves are available:
- linear
- cylindrical tank
- spherical tank
- user programmable curve
On oscillator CAP E32 H you can enter under
"user programmable curve" also own
linearisation curves for special vessels, e.g.
vertical cylindrical tanks with large conical
outlet.
Push the button Edit. You can enter the value
pairs (percentage value - volume value) for 32
index markers.
Push the button Transfer , to enquire further
linearisation curves.
Integration time
Choose this function when you want to adjust
an integration time (damping).
The possible integration time is between 0,5
and 300 seconds. As a standard feature an
integration time of 0,5 seconds is adjusted. For
an integration time of 0,5 s you have to enter
the value 0.
After the adjusted integration time, a measured
value change of 63 % is available on the
output.
33