VEGA VEGASWING 61 - two-wire - Manual (Page 8)

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3 Product description
VEGASWING 61 • - two-wire
29227-EN-130409
3.2 Principle of operation
VEGASWING 61 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. With its tuning
fork of only 40 mm length, VEGASWING 61 can also be mounted e.g.
in pipelines from DN 32. The small tuning fork allows use in vessels,
tanks and pipes. Thanks to its simple and robust measuring system,
VEGASWING 61 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 61 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 one of these faults is detected, the electronics signals it via a
defined current to the signal conditioning instrument. The connection
cable to the sensor is also monitored for line break and short-circuit.
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, transferred as a current value to the processing system and
converted there into a switching command.
Depending on your requirements, VEGASWING 61 with two-wire
electronics can be connected to different signal conditioning instru-
ments. Compatible signal conditioning instruments are listed in
chapter "Technical data".
The data for power supply are specified in chapter "Technical data".
3.3 Operation
The switching condition of VEGASWING 61 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)
•
DIL switch for adaptation to the product density
Application area
Functional principle
Voltage supply