KROHNE VARIFLUX IFS 6000 F-EEx EN - Manual (Page 12)

12 ALTOFLUX IFS 4000F-EEx, PROFIFLUX IFS 5000F-EEx, VARIFLUX IFS 6000F-EEx
In case that heat-resistant cables are required, install the intermediate junction box ZD-EEx at a
distance up to 5 m from the IFS x000 F-EEx primary head. Connect the heat-resistant cables
(cables type D and E in next section) between the primary head's junction box and the intermediate
junction box ZD-EEx. The standard cables (types B and C) can be used between signal converter
unit and intermediate junction box. See the second connection diagram for details (section 2.6).
The silicone rubber insulated connecting cable for the magnetic field coils circuit must be protected
against mechanical damages between the primary head and intermediate junction box by a conduit
system with edge protections. Intermediate box ZD-EEx has terminals with type of protection
increased safety "EEx e" according to EN 50019. The intermediate box is incorporated into the
equipotential bonding system of the installation through its external clamp terminal.
2.5 Connecting cables
Notes:
• The below described cables are shown in the connection diagrams. See section 2.6.
• In case that heat-resistant cables have to be used - depends on meter size, process
liquid and ambient temperature - the so-called intermediate junction box type ZD-EEx
must be used. See General information in Section 1 for details.
• The maximum length of the connecting cables between the IFS x000 F-EEx primary
head and the associated signal converter is for safety reasons limited at 50 m. A
shorter cable length can be prescribed for measurement technical reasons, see
therefore the standard Installation and Operating Instructions.
Cable A
Signal cable for current output and binary outputs (pulse and status output). The cable parameters
must be in accordance with the regulations in the EN 60079-14 "Electrical installations in
hazardous locations" or an equivalent national standard.
Cable B
Power supply cable. The cable parameters must be in accordance with the regulations of the EN
60079-14 "Electrical installations in hazardous locations" or an equivalent national standard.
Rated voltage
≥ 500 V
Examples H07..-., H05..-.
Cross-sectional area of core
1.5 to 2.5 mm
2