VEGA Capacitive electrodes EL 4 … 20 mA - Compact - Manual (Page 13)

Capacitive electrodes EL 4 … 20 mA - Compact 13
22652-EN-020809
Product description
1.4 Approvals
Explosion protection
Only certified capacitive electrodes EL** Ex 0
may be used in hazardous areas with com-
bustible gases, vapours or fog.
Capacitive electrodes EL** Ex 0 are suitable
for use in hazardous areas of zone 1 and
zone 0.
The explosion protection provided by these
instruments is certified by the EC type ap-
proval and the conformity certificate, possibly
with national zone 0 annex, issued by the
approval authority. These documents are
generally attached to the instruments.
When the capacitive electrodes are mounted
and operated in hazardous areas, the Ex
installation regulations must be noted.
The information and regulations in the sup-
plied certificates (EC type approval certificate,
conformity certificate) of the capacitive elec-
trodes as well as of the accompanying de-
vices (signal conditioning instrument,
separator, safety barrier) must be noted.
• As a rule, the installation of Ex systems
must be carried out only by qualified per-
sonnel.
• The capacitive electrodes must be powered
from an intrinsically safe circuit; the permis-
sible electrical values are stated in the
accompanying certificate.
• Capacitive electrodes with electrostatically
chargeable plastic parts come with a warn-
ing label informing of measures to be taken
to avoid the dangers of electrostatic dis-
charges. Note the information on the warn-
ing label.
• The explosion protection of the instrument
used is only ensured when the limit tem-
peratures stated in the certificate are not
exceeded.
• In case of danger due to oscillation or vibra-
tion, the appropriate parts of the capacitive
electrodes must be protected.
• After shortening the electrode cable, make
sure the gravity weight is sufficiently se-
cured by means of the pins.
Overfill protection acc. to WHG
The statements and regulations of the at-
tached type approvals must be noted if a
capacitive electrode is used as part of an
overfill protection system for vessels storing
water-endangering liquids. The general type
approval must be available at the application
site.
Electrodes must only be used in liquids
against which the materials of the wetted parts
are sufficiently chemically resistant.
Ship approvals
For use on ships, type approval certificates
are available from several ship classification
authorities (GL, LRS, ABS, BV, RINA).
CE approval
The capacitive electrodes EL meet the protec-
tive regulations of EMC (89/336/EWG) and
NSR (72/23/EWG). Conformity has been
judged acc. to the following standards:
EMC
Emission EN 50 081 - 1
Susceptibility EN 50 082 - 2
NSR EN 61 010 - 1
Zone 2
According to DIN VDE 0165, instruments can
be used in hazardous areas of zone 2 without
approval; they must meet the requirements in
section 6.3 of this VDE. The compliance of the
instruments with these requirements is con-
firmed by VEGA in a manufacturer declaration.