Principle Of Operation; Adjustment - Vega VEGAVIB 63 Operating Instructions Manual

3 Product description
Application area
Functional principle
Voltage supply
8
You can find the serial number on the inside of the instrument as well
as on the type label on the outside.
3.2

Principle of operation

VEGAVIB 63 is a point level sensor with vibrating rod for level detec-
tion.
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, VEGAVIB 63 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 VEGAVIB 63 was ordered for solid detection in water, the vibrating
rod is calibrated to the density of water. If covered by water (density:
1 g/cm³/0.036 lbs/in) VEGAVIB 63 signals "uncovered". Only if 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 VEGAVIB 63 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 vibrating rod is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 360 Hz. When the vibrat-
ing rod is submerged in the product, the vibration amplitude changes.
This change is detected by the integrated electronics module and
converted into a switching command.
VEGAVIB 63 with NAMUR electronics can be connected to different
NAMUR amplifiers depending on your requirements. The specifica-
tions for NAMUR amplifiers are available in the "Technical data".
The data for power supply are specified in chapter "Technical data".
3.3

Adjustment

With the factory setting, products with a density of > 0.03 g/cm³
(0.0011 lbs/in³) can be measured. It is possible to adapt the instru-
ment for products with lower density > 0.02 g/cm³ (0.0007 lbs/in³).
On the electronics module you will find the following display and
adjustment elements:
•
Control lamp for indication of the switching status (yellow)
•
Potentiometer for adaptation to the product density
VEGAVIB 63 • NAMUR