VEGA VEGASON 54V…56V - Manual (Page 11)

VEGASON 54V … 56V 11
Types and versions
2.4 Configuration of measuring
systems
A measuring system consists of a sensor
and a processing unit. The processing unit (
the VEGAMET signal conditioning instrument
or the VEGALOG processing system) evalu-
ates the level-proportional digital measuring
signals in a number of processing routines
and outputs the levels as individual current,
voltage or switching signals.
Two sensors can be connected via one two-
wire cable to the VEGAMET 515V signal
conditioning instrument. Up to 255 sensors
can be connected to the VEGALOG 571
processing system. 15 sensors (loop pow-
ered) on one two-wire cable.
Beside the output of the levels in percent,
cubicmeters or other physical units, also
current, voltage or switching signal (relay or
transistor), the levels can be also processed
by linked processing algorithms. Scaling,
linearisation, calculation of linearisation
curves, differential generation, addition or
tendency processing are fixed implemented
as processing routines in the VEGALOG
processing systems and VEGAMET and are
easily accessible via the menu.
On the following pages you find examples of
two different instrument configurations
(measuring systems) consisting of sensor(s)
and processing system.
2.3 Approvals
When using ultrasonic sensors in Ex areas or
in marine applications, the instruments must
be suitable and approved for the explosion
zones and application areas.
The suitability is tested by approval authori-
ties and is certified in approval documents.
VEGASON 50 ultrasonic sensors are ap-
proved for Ex zone 1, 10, 11, 21 and 22.
Please note the attached approval docu-
ments when using a sensor in Ex area.