8
3 Product description
VEGAWAVE 62 • Two-wire 8/16 mA
32255-EN-181126
on the inside of the instrument as well as on the type label on the
outside.
3.2 Principle of operation
VEGAWAVE 62 is a point level sensor with tuning fork for point level
detection.
It is designed for industrial use in all areas of process technology and
is preferably used for bulk solids.
Typical applications are overfill and dry run protection. Thanks to its
simple and robust measuring system, VEGAWAVE 62 is virtually unaf-
fected by the chemical and physical properties of the bulk solid.
It also works when subjected to strong external vibrations or changing
products.
Solid detection in water
If VEGAWAVE 62 was ordered for solids detection in water, the tuning
fork is set to the density of water. In air or when immersed in water
(density: 1 g/cm³/0.036 lbs/in), VEGAWAVE 62 signals "uncovered".
Only when the vibrating element is also covered with solids (e.g.
sand, sludge, gravel etc.) will the sensor signal "covered".
Function monitoring
The electronics module of VEGAWAVE 62 continuously monitors the
following criteria:
•
Correct vibrating frequency
•
Line break to the piezo drive
If one of these faults is detected, the electronics signals this via a
defined current to the signal conditioning instrument. The connection
cable to the vibrating element is also monitored.
The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 150 Hz. When the tuning
fork is submerged in the product, the vibration amplitude changes.
This change is detected by the integrated electronics module and
converted into a switching command.
Depending on your requirements, VEGAWAVE 62 with two-wire elec-
tronics can be connected to different signal conditioning instruments.
Compatible signal conditioning instruments are listed in chapter
"
Technical data
".
The data for power supply are specified in chapter "
Technical data
".
3.3 Adjustment
On the electronics module you will find the following display and
adjustment elements:
•
Signal lamp for indication of the switching condition (green/red)
•
Potentiometer for adaptation to the product density
•
Mode changeover for selection of the output current
Application area
Functional principle
Voltage supply
