VEGA VEGASCAN 850 - Manual (Page 13)

VEGASCAN 850 13
Types and versions
2.6 Configuration of measuring
systems
A measuring system consists of one to 15
(30) sensors and a VEGASCAN 850. The
processing unit (VEGASCAN 850 signal
conditioning instrument) evaluates the level-
proportional, digital measuring signals in a
number of processing routines and outputs
the levels as process bus signal.
Beside the output of the levels in percent,
cubic meters and other physical units, the
levels can be also processed by linked
processing algorithms. Scaling, linearisation,
calculation of linearisation curves, differential
generation, addition or tendency processing
are implemented in VEGASCAN 850 as intrin-
sic processing routines and are easily ac-
cessible via the menu.
On the following pages you will find three
instrument configurations (measuring sys-
tems) consisting of sensor(s) and process-
ing unit.
Note:
It is possible to operate up to 15 sensors on
one two-wire cable, see following page (con-
figuration A). However, it would be more
suitable to plan the measuring system in
such a way that max. five sensors are oper-
ated on one two-wire cable. For this reason,
VEGASCAN is equipped with three clamping
positions for a VBUS input. The sensor ar-
rangement can either be made linearly (con-
figuration B) or radially (configuration C).
2.5 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.