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

12 Capacitive electrodes EK - Profibus PA
Product description
1.4 Approvals
Explosion protection
Only certified EK** Ex 0 capacitive electrodes
may be used in hazardous areas with
combustible gases, vapours or fog. Capacitive
electrodes EK**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
areas, the Ex installation regulations must be
noted. The information and regulations in the
supplied certificates (EC type approval,
conformity certificate) of the capacitive
electrodes as well as of the accompanying
devices (signal conditioning instrument,
separator, 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
permissible electrical values are stated in the
accompanying certificate.
• Capacitive electrodes with electrostatically
chargeable plastic parts come with a
warning label informing of measures to be
taken to avoid the dangers of electrostatic
discharges. Note the information on the
warning label.
• The explosion protection of the instrument
used is only ensured when the limit
temperatures stated in the certificate are not
exceeded.
• In case of danger due to oscillation or
vibration, the appropriate part of the
capacitive electodes must be protected.
• After shortening the electrode cable, make
sure the gravity weight is sufficiently secured
by means of the pins.
CE approval
The capacitive electrodes type EK meet the
protective regulations of EMVG (89/336/
EWG) and NSR (72/23/EWG). Conformity has
been judged acc. to the following standards:
EMVG 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 confirmed by VEGA in a
manufacturer declaration.