Owner's manual

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.