VEGA VEGAFLEX 82 Foundation Fieldbus - Manual (Page 50)

50
7 Setup with PACTware
VEGAFLEX 82 • Foundation Fieldbus
44221-EN-130910
Application - Level measurement
The level measurement refers to the product surface which is the limit
to the gas phase.
•
With bulk solids:
– Dusts, wood chips - dielectric constant < 1.5
– Granules, dusts, powders - dielectric constant 1.5 … 3
– Cereals, flour - dielectric constant > 3
Adjustment for the level measurement
If you have selected level measurement in the previous menu, then
you can enter the values for the min. and max. adjustment. The value
to be entered refers to the distance from the sealing surface of the
process fitting (sensor reference plane) to the surface of the product.
A linearization is required if the measured value should be outputted
volume-proportional and not level-proportional. You can find further
linearization types in the extended adjustment.
If you have a non-linear vessel, you can select here the respective
linearization curve.
•
Linear
•
Spherical tank
•
Horizontal cylindrical tank
In addition you have to enter the following vessel dimensions with
non-linear conditions:
•
Height of the socket h
•
Vessel height D
These settings allow you to optimize the sensor. With them you can
compare a sounded distance with the indicated value and correct it, if
necessary.
Probe immersed in the liquid (covered)
Select whether or not the probe is immersed in the medium.
Measured distance to the medium
If the probe is immersed in the medium, you can enter here the meas-
ured distance to the medium.
Displayed distance correct?
Is the displayed distance value correct? If you have the possibility, you
can enter here the sounded distance to the medium.
False signal suppression
With this function, you can carry out the automatic false signal sup-
pression.
Note:
A false signal suppression is only recommended with liquid applica-
tions.
Step 3
Adjustment
Step 4
Linearization
Step 5
Sensor optimization