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Rechner Sensors TiLevel KFI-1 Instrucciones De Manejo página 12

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General description
Automatic compensation for changes in dielectric constant
The level measurement has automatic compensation of the DK change (DK = dielectric constant)
medium to be measured. This is particularly advantageous for level measurements with changing media
or changes in the dielectric properties of the medium. A "reference" measurement is carried out for DK
compensation. For this purpose, there is a reference area in the probe tip, which is part of the measuring
section. This means that the measuring section extends over the entire length of the probe (excluding
inactive areas). Please refer to Fig. 1 + 2 for the distribution of the areas.
For devices with analogue output IL4 / UL0, the measured value signal increases as the level increases.
For devices with analogue output IL20 / UL10, the measured value signal decreases as the level in-
creases.
Technical data
• DK compensation over wide range εr = 1.5...80
• Measuring rate = 1/second, measuring error = 1.5% ...8%.
• Reference range: R > 4% of measuring distance M, Rmin = 20 mm
• Screen range: IBS > 20 mm, standard = 50 mm
• Measurement over the entire probe length: reference range (R) as part of the measuring distance (for
your exact measurements, please refer to the data sheet)
• Measurement after empty calibration (without full calibration) possible*, on the basis of the factory
calibration
• *Full adjustment (optional): Adjustment to the respective application
• Factory calibration: basic setting for reference conditions (cylindrical container)
• Adjustment via Easy Teach by Wire (ETW) or Magnet (ETM)
• Level measurement values or standard signals via analogue output Aout
12
Level control systems for continuous measurements
The capacitive measuring systems of the TiLevel series are designed for
continuous level measurement and are based on the patented 3-electrode
measuring principle from RECHNER SENSORS.
The patented 3-electrode measuring principle includes the contain-
er in the measurement. The container must therefore be made of
metal or an additional electrode, e.g. metal foil or metal rod, which
at least covers the measuring range, must be attached to the con-
tainer. (Length of foil ≥ probe length). The resulting large measuring
volume is the reason why deposits on the probe surface are practi-
cally irrelevant for the measurement.
On the left you can see a schematic representation of the meas-
uring ranges of a level probe. You can see that the probe meas-
ures a disc-shaped area up to the tank wall over the entire meas-
uring section and not just a small area surrounding the probe.
At the tip of the probe there is the reference range, which records
the DK of the medium for automatic DK compensation.
For the measuring range the container diameter or the distance to
the counter electrode have to be the same over the whole measur-
ing range. This is important to guarantee the linearity of the meas-
urement.
ε
of the
r

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