VEGA VEGACAL 67 For connection to a signal conditioning instrument - Manual (Page 10)

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3 Product description
VEGACAL 67 • For connection to a signal conditioning instrument
31761-EN-130917
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2
3
Fig. 3: Functional principle - Plate capacitor
1 Distance between the electrode surfaces
2 Size of the electrode surfaces
3 Type of dielectric between the electrodes
The probe and the vessel wall are the capacitor plates. The measured
product is the dielectric. Due to the higher dielectric constant of the
product compared to air, the capacitance increases as the probe is
gradually covered.
The capacitance as well as the resistance change are converted by
the electronics module into a level-proportional signal.
4 … 20 mA two-wire electronics for voltage supply and measured
value transmission on the same cable.
The supply voltage range can differ depending on the instrument
version.
The data for power supply are specified in chapter "Technical data".
3.3 Operation
VEGACAL 67 measurement signals can be evaluated with the follow-
ing:
•
With a VEGAMET signal conditioning instrument
The measuring range must be selected on the electronics module of
the probe.
The full and empty adjustment can be carried out on a VEGAMET
signal conditioning instrument or the analogue input card of a PLC.
3.4 Packaging, transport and storage
Your instrument was protected by packaging during transport. Its
capacity to handle normal loads during transport is assured by a test
based on ISO 4180.
The packaging of standard instruments consists of environment-
friendly, recyclable cardboard. For special versions, PE foam or PE
foil is also used. Dispose of the packaging material via specialised
recycling companies.
Voltage supply
Packaging