VEGA VEGASWING 66 - two-wire - Manual (Page 9)

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3 Product description
VEGASWING 66 • - two-wire
43758-EN-130322
3.2 Principle of operation
VEGASWING 66 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. It is particularly suitable for applications with
high temperatures up to 450 °C (842 °F) and high process pressure
up to 160 bar (2320 psig).
Typical applications are overfill and dry run protection. The small
tuning fork allows use in pipelines. Thanks to its simple and rugged
measuring system, VEGASWING 66 is virtually unaffected by the
chemical and physical properties of the liquid.
It functions even under difficult conditions such as turbulence, foam
generation, buildup, strong external vibration or changing products.
Function monitoring
The electronics module of VEGASWING 66 continuously monitors via
frequency evaluation the following criteria:
•
Strong corrosion or damage on the tuning fork
•
Loss of vibration
•
Line break to the vibrating 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 66 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
With the factory setting, products with a density > 0.07 g/cm³
(0.025 lbs/in³) can be detected. The instrument can be adapted to
products with lower density.
On the electronics module you will find the following display and
adjustment elements:
•
Signal lamp for indication of the operating condition (green)
•
Signal lamp for indication of the switching condition (yellow)
•
Control lamp for fault indication (red)
•
DIL switch for sensitivity adjustment
•
Mode switch for selecting the switching behaviour (min./max.)
Application area
Functional principle
Voltage supply