9
3 Product description
VEGACAP 69 • Two-wire
31177-EN-230510
3.2 Principle of operation
VEGACAP 69 is a point level sensor for use in aggressive liquids in
non-conductive vessels.
The double rod probe is fully insulated and highly resistant.
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 two probes 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 material gradually
covers the probe.
The capacitance change is converted by the electronics module into
a switching command.
Depending on your requirements, VEGACAP 69 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
