KROHNE ALTOFLUX IFM 4080 K EEx EN - Manual (Page 6)

5
2 ELECTRICAL CONNECTION
2.1 Equipotential bonding system
The IFM 4080 K-EEx and IFM 4080 K / i-EEx flowmeters must always be incorporated into
the equipotential bonding system of the hazardous area. This connection can be achieved
through the PE/FE conductor connected to the PE terminal in the terminal compartment
(see figure 1) or through a separate PE conductor, cross sectional area at least 4 mm
2 ,
connected to the external PE clamp, placed below the converter housing.
2.2 Regular IFC 090-EEx electronics unit
The field cables that enter the terminal compartment of the IFC 090-EEx signal converter unit
(i.e. power supply, current and binary outputs) are non-intrinsically safe. To connect external
devices to the signal output terminals, the wiring requirements for the type of protection of
the compartment (standard: increased safety "e", optional: flameproof "d") must be conform
to the international or national standard involved (e.g. EN 60079-14).
The terminal arrangement is shown by figure 1 below.
Figure 1: Terminal arrangement in terminal compartment.
Figure 2 Passive pulse/status output Figure 3 Active current output
B1 B
⊥
B2 I+ I L N (100…240Vac / 48…63 Hz)
L ½ L ½ (24Vac/dc)
BINARY CURRENT
OUTPUTS OUTPUT
PE (Protective Earth) terminal
FE (Functional Earth) terminal
PULSE, STATUS OUTPUTS
RESP. CONTROL INPUTS
Ri
≤
500
Ω
I+ I
mA
+
_
½
B1 B
⊥
B2
I
≤
150 mA
U
ext
≤
32Vdc/24 Vac
000
Electronic or
electro-
mechanical
totalizer
I
≤
150 mA
U
ext
e.g. signal
indicator