VEGA VEGASWING 83A EXD - Manual (Page 4)

4 VEGASWING 81A EXD and 83A EXD
Product description
Recurring test acc. to WHG
According to the type approval to WHG
(Z-65.11-154) the recurring test acc. to WHG
can be carried out by pushing the test key
on the VEGA TOR 536 EX, 537 EX, 636 EX
signal conditioning instrument. The sensor
must neither be removed, nor should re-
spond by filling of the vessel. This is valid for
VEGASWING 81A EXD and 83A EXD with
two-wire oscillator SWING E82 Z (EX).
VEGASWING 81A EXD and 83A EXD meet in
mode A (overfill protection) the fail-safe re-
quirements to class 3 to class 3 (AK 1 … 3)
acc. to DIN 19 251.
Configuration
A measuring system consists of:
- a VEGASWING with oscillator
SWING E82 C, SWING E82 R or
SWING E82 T
- external instruments, switched by VEGA-
SWING
or
- a VEGASWING with oscillator
SWING E82 Z(EX)
- VEGATOR 536 EX, 537 EX or 636 EX signal
conditioning instrument or to an already
mounted instrument, e.g. VEGA TOR
425 EX, 534 EX, 825 EX
- external instruments switched by VEGA-
TOR.
Housing
Pressure-tight encapsulation (d)
DIN EN 50 018/VDE 0170/0171 part 5.
With a pressure-tight encapsulation the parts
which can ignite an explosive atmosphere
are located in a housing, withstanding the
pressure caused by an explosion of an ex-
plosive mixture inside and avoiding that the
explosion is spread to the explosive atmos-
phere around the housing.
VEGASWING with EXD-housing has a pres-
sure-tight encapsulated space for the oscilla-
tor as well as a pressure-tight encapsulated
separate terminal box. The oscillator box is
connected via a climatically tight cable entry
with the separate terminal box. The lines for
the supply voltage and switching signals
lead via a pressure-tight encapsulated cable
entry to the terminal box of the VEGASWING-
housing. This has the advantage, that the
wiring should not be made intrinsically safe
(ia), but in increased safety and loop with a
voltage up to 250 V to the sensor . With the
signal line it is possible to control without a
signal conditioning instrument directly a DCS
or connected signallers.
Exclusively use approved cable entries for
EExd.
1.2 Approvals
Explosion protection
In hazardous areas caused by combustible
gases, vapours or fog, only certified VEGAS-
WING 81A EXD, 83A EXD vibrating level
switches. VEGASWING 81A EXD, 83A EXD
are suitable for the use in hazardous areas of
zone 1.
The EC-type approval issued by the ap-
proval authority is attached to the instruments
as proof for the explosion protection. When
VEGASWING 81A EXD, 83A EXD vibrating
level switches are mounted and operated in
hazardous areas, the Ex-mounting regula-
tions should be noted. The information and
conditions of the supplied certificates (EC-
type approval, conformity certificate) of
VEGASWING 81A EXD, 83A EXD have to be
noted.