Samson 3730 Series - Special instructions concerning explosion protection

EB 8384-3 EN 1-7
Safety instructions and measures
1.4 Special instructions concerning explosion protection
Explosive dust atmospheres of zone21 or zone22
Î ThefollowingappliestotypeofprotectionExiincombustibledustatmospheres:
– Ifintrinsicsafetyisimpairedbytheinuenceofdust,anenclosurecomplyingwith
Clause6.1.3ofEN60079-11withatleastdegreeofprotectionIP5Xmustbe
used.TherequirementsaccordingtoClause6.1.3applytothecableentriesand
conduit systems accordingly.
– ThedegreeofingressprotectionisveriedbyatestaccordingtoIEC60529and
EN60079-0(e.g.performedbyVDE).
Î For use in the presence of combustible dust in compliance with type of protection
ExtbIIIC(protectionbyenclosure),observeclause5.6.3ofEN60079-14.
Equipment for use in zone2/zone22
Î InequipmentoperatedaccordingtotypeofprotectionExnA(non-sparkingequip-
ment)accordingtoEN60079-15,circuitsmaybeconnected,interruptedorswitched
while energized only during installation, maintenance or repair.
Î Observe the special conditions of use mentioned in the statement of conformity for the
rated values and the installation of the series-connected fuse for interconnection of
ExnAcircuits.
Î PositionerswithtypeofprotectionExnAorExtccanbeusedwithacoverwithor
without window.
Î TheTypes3730-31,3730-35and3730-38Positionersare100%identicalinde-
sign, except for the marking and the housing cover.
Î FortypeofprotectionExnA,connecttheVCCconnectionintheprograminterface
adapterinserieswithafuseaccordingtoIEC60127,250VForTwithafuserating
of max. I
N
≤40mA.
Î ConnectthesignalcurrentcircuitinserieswithafuseaccordingtoIEC60127-2/VI,
250VTwithafuseratingofI
N
≤63mA.
Î ConnectthetransmittercurrentcircuitinserieswithafuseaccordingtoIEC60127-
2/VI,250VTwithafuseratingofI
N
≤40mA.
Î Install the fuses outside the hazardous area.