Vega VEGACAP 98, Operating Instructions Manual

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3 Product description
VEGACAP 98 • Relay (DPDT)
33760-EN-230510
3.2 Principle of operation
VEGACAP 98 is an adjustment-free, economic point level sensor for
liquids and bulk solids.
It is ideal as overfill or dry run protection system in adhesive, conduc -
tive products. The VEGACAP 98 works in liquids from a dielectric
constant of 1.5. The process fitting is a thread G1½.
Probe, measured product and vessel wall form an electrical capacitor.
The capacitance is influenced by three main factors.
1
2
3
Fig. 2: 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.
VEGACAP 98 is a compact instrument, i.e. it can be operated without
external evaluation system. The integrated electronics evaluates the
level signal and outputs a switching signal. With this switching signal,
a connected device can be operated directly (e.g. a warning system,
a pump etc.).
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 switching status
•
Potentiometer for switching point adaptation (covered)
Application area
Functional principle
Voltage supply