VEGA Capacitive electrodes EL Profibus PA - Manual (Page 12)

12 Capacitive electrodes EL - Profibus PA
Product description
1.4 Approvals
Explosion protection
Only certified capacitive electrodes EL** Ex 0
may be used in hazardous areas with combus-
tible gases, vapours or fog. Capacitive elec-
trodes EL** Ex 0 are suitable for use in
hazardous areas of zone 1 and zone 0. Proof
of the explosion protection provided by these
instruments is the EC type approval 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 ar-
eas, the Ex installation regulations must be
noted. The information and regulations in the
supplied certificates (EC type approval certifi-
cate, conformity certificate) of the capacitive
electrodes as well as of the accompanying
devices (signal conditioning instrument, sepa-
rator, safety barrier) must be noted.
• As a rule, the installation of Ex systems must
be carried out only by qualified personnel.
• The capacitive electrodes must be powered
from an intrinsically safe circuit; the permissi-
ble electrical values are stated in the accom-
panying 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 warning
label.
• The explosion protection of the instrument
used is only ensured when the limit tempera-
tures stated in the certificate are not ex-
ceeded.
• In case of danger due to oscillation or vibra-
tion, the appropriate part of the capacitive
electrodes must be protected.
• After shortening the electrode cable, make
sure the gravity weight is sufficiently secured
by means of the pins.
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 type EL meet the
protective 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 with-
out approval; they must meet the require-
ments in section 6.3 of this VDE. The
compliance of the instruments with these
requirements is confirmed by VEGA in a
manufacturer declaration.