VEGA VEGASWING 63 - transistor (NPN-PNP) - Manual (Page 8)

8
3 Product description
VEGASWING 63 • - transistor (NPN/PNP)
29230-EN-130409
In addition to the type label outside, you can also find the serial num-
ber on the inside of the instrument.
3.2 Principle of operation
VEGASWING 63 is a point level sensor with tuning fork for level
detection.
It is designed for industrial use in all areas of process technology and
can be used in liquids.
Typical applications are overfill and dry run protection. The small
tuning fork allows use in all kinds of tanks and vessels. Thanks to its
simple and rugged measuring system, VEGASWING 63 is virtually
unaffected by the chemical and physical properties of the liquid.
It functions even under difficult conditions such as turbulence, air bub-
bles, foam generation, buildup, strong external vibration or changing
products.
Fault monitoring
The electronics module of VEGASWING 63 continuously monitors via
frequency evaluation the following criteria:
•
Strong corrosion or damage on the tuning fork
•
Loss of vibration
•
Line break to the piezo drive
If a malfunction is detected or in case of power failure, the electronics
takes on a defined switching condition, i.e. the output is open (safe
condition).
The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 1200 Hz. The piezos are
fixed mechanically and are hence not subject to temperature shock
limitations. The frequency changes when the tuning fork is covered
by the medium. This change is detected by the integrated electronics
module and converted into a switching command.
VEGASWING 63 is a compact instrument, i.e. it can be operated with-
out 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 Operation
The switching condition of VEGASWING 63 with plastic housing can
be checked when the housing is closed (signal lamp). With the basic
setting, products with a density > 0.7 g/cm³ (0.025 lbs/in³) can be de-
tected. The instrument can be adapted if products with lower density
are to be measured.
On the electronics module you will find the following indicating and
adjustment elements:
•
Signal lamp for indication of the switching condition (green/red)
Application area
Functional principle
Voltage supply