VEGA Capacitive electrodes EK … with signal conditioning instrument - Manual (Page 14)

14 Capacitive electrodes EK with signal conditioning instrument
Product description
1.4 Approvals
Explosion protection
Only certified capacitive electrodes EK**Ex 0
must be used in hazardous areas with com-
bustible gases, vapours or fog.
Capacitive electrodes EK**Ex 0 are suitable
for the use in hazardous areas of zone 1 and
zone 0. Proof for the explosion protection of
these instruments is the EC-type approval
and the conformity certificate possibly with
national zone 0 - annex. These documents
are generally attached to the instrument.
When the capacitive electrodes are mounted
or operated in hazardous areas, the Ex-
installation regulations must be noted.
The information and regulations of the sup-
plied certificates (EC-type approval, con-
formity certificate) of the capacitive
electrodes as well as of the appropriate in-
strument (signal conditioning instrument,
separator, safety barrier) must be noted.
• The mounting of Ex-systems must be gen-
erally carried out by skilled staff.
• The capacitive electrodes must be pow-
ered by an intrinsically safe circuit; the
permissible electrical values are stated in
the appropriate certificate.
• Capacitive electrodes with electrostatically
chargeable plastic parts are provided with
a warning label informing about measures
which must be taken to avoid dangers
caused by electrostatic discharges. Note
the contents of the warning label.
• The explosion protection of the instrument
used is only ensured when the limit tem-
peratures stated in the certificate are not
exceeded.
ˇ In case of danger due to oscillation or
vibration, the appropriate parts of the ca-
pacitive electrodes must be secured.
• After shortening of the electrode cable, it
must be noted that the weight is sufficiently
secured by means of pins.
WHG
The electrodes EK … Ex0 are also approved
as part of an overfill protection for vessels
storing water endangering liquids.
Ship approvals
For the use on ships, type approval certifi-
cates are available of several ship classifica-
tion authorities (GL, LRS, ABS, BV, RINA).
For electrodes certified for Ex-Zone 0, only
PTFE and FEP are permitted as isolating
materials acc. to ATEX II 1/2 G EEx ia IIC T6.
CE-approval
The capacitive electrodes EK meet the pro-
tective regulations of EMVG (89/336/EWG)
and NSR (72/23/EWG). The 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 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 Messrs. VEGA
in a manufacturer declaration.