10
3 Product description
VEGACAP 67 • Two-wire
31317-EN-200929
3.2 Principle of operation
The VEGACAP 67 is a point level sensor for bulk solids. The probe is
designed for high temperature applications.
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 67 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.
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.
Application area
Functional principle
Voltage supply
Packaging
