9
3 Product description
VEGACAP 64 • Two-wire
30015-EN-230510
3.2 Principle of operation
VEGACAP 64 is a point level sensor for use in non-abrasive liquids
and bulk solids.
The rod probe is fully insulated and due to its construction is suitable
for all viscous and adhesive products.
The device is optionally available with increased sensitivity for foam
detection.
Probe, measured product and vessel wall form an electrical capacitor.
The capacitance is influenced by three main factors.
1
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 change is converted by the electronics module into
a switching command.
Depending on your requirements, VEGACAP 64 with two-wire elec-
tronics can be connected to different controllers. Compatible control-
lers are listed in chapter "
Technical data
".
The data for power supply are specified in chapter "
Technical data
".
3.3 Adjustment
The probe can be adapted to the dielectric constant of the product
directly on the electronics module.
A switching command can be triggered when the probe is covered or
laid bare.
On the electronics module you will find the following display and
adjustment elements:
•
Control lamp for indication of the device status.
Application area
Functional principle
Voltage supply
