VEGA VEGATOR 622 - Manual (Page 10)

10 VEGATOR 620 … 622
Electrical connection
3 Electrical connection
3.1 Connection instructions
The following connection plans are valid for
standard as well as for Ex versions of the
signal conditioning instruments. Please ob-
serve the following instructions:
-
the relay contacts are shown in their con-
dition in the absence of current
- if strong electromagnetic interferences are
expected, we recommend the use of
shielded cable for the signal cables
- the shielding must be grounded only on
one sensor or signal conditioning instru-
ment side
- if there is the danger of overvoltage, the
use of VEGA overvoltage arresters is
recommended
- the connection should be made according
to country-specific installation standards
(e.g. in Germany acc. to the VDE
regulations).
3.2 Connection instructions for
Ex approved applications
For the following applications, certified instru-
ments are required:
-
in hazardous areas (if necessary, observe
the special national regulations)
- as part of an overfill protection system
acc. to WHG
- in the shipbuilding industry
- for pressurized vessels.
For these applications, the respective official
documents (test reports, test certificates,
general type approval and conformity certifi-
cates) as well as the applicable mounting
and operating instructions should be ob-
served. The official documents are supplied
with the respective instrument.
In Ex applications, the voltage supply of the
sensor must be delivered only through an
intrinsically safe circuit. This can be done by
means of:
-
VEGATOR series 600 signal conditioning
instrument in Ex version
- not certified VEGATOR series 600 signal
conditioning instrument with VEGA safety
barrier type 145
Please also note the official documents of
these additional instruments.