KROHNE OPTISONIC 3400 CSA EN - Manual (Page 18)

4
ELECTRICAL CONNECTIONS
18
OPTISONIC 3400
www.krohne.com 10/2013 - 7313222100 - AD CSA OPTISONIC 3400 -en- R01
4.1 General
The OPTISONIC 3400 C(/i) -DIV1 compact flowmeter and UFC 400 F(/i) -DIV1 signal converter
(separate version) must be incorporated in the equipotential bonding system of the installation.
This can be established internally by connection of the protective earth (PE) conductor of the
mains supply system to the internal PE clamp, or externally, by connecting a separate
equipotential bonding conductor to the external U-clamp terminal (size M5) at respectively the
flange of the mounting support (in case of compact instruments) or at the mounting device (for
signal converters in separate version). A separate bonding conductor must have a cross-
sectional area of at least 4 mm
2
.
The display cover seals the electronics compartment of the converter housing and provides type
of protection “explosion-proof enclosure”. The terminal compartment is default in type of
protection "non-incendive" and can optionally be performed as explosion-proof enclosure .
The threaded joints formed by the covers and housing are a tight fit due to the requirements for
type of protection “explosion-proof enclosure”. Screw the covers on and off with care and never
use excessive force !
Keep the screw-threads free of dirt and well-greased (e.g. with PTFE grease). The grease will
help to prevent the threads from locking due to corrosion. To unscrew the covers, first release
the interlocking devices (one at each cover). Therefore unscrew the M4 head screw with internal
hexagon socket set using a No. 3 Allen key until the interlocking device can be turned. After the
covers are screwed back onto the housing, make sure that the interlocking devices are properly
refitted.
WARNING!
Allow the electronics to de-energize before opening the electronics compartment of the flow
converter housing. Wait at least 35 minutes for T6 and 10 minutes for T5 before opening.
INFORMATION!
For more detailed information regarding electrical connections for USA / Canada (FM / CSA)
DIV1 systems, see the KROHNE Altometer control drawings nr; 8.30736.32 A & 8.30736.30 B
Figure 4-1: Electrical connections
1 Unscrew interlocking head screw
2 Turn cover counterclockwise and remove
3 Open / close safety lid of mains supply section
4 Mains supply & signal / data terminals