KROHNE ALTOFLUX 2W IFM 4042K EEx-ATEX EN - Manual (Page 6)

6 ALTOFLUX 2W IFM 4042 K - EEx
2 Electrical connection
2.1 Equipotential bonding system
The IFM 4042 K-EEx magnetic-inductive compact flowmeter must be incorporated into the
equipotential bonding system through the internal of external PE-clamp. Latter clamp is suitable
for wires till 4 mm
2 cross section.
Disconnection from the equipotential bonding system is only allowed when the flowmeter is not in
contact with power supplies or ground voltages outside the hazardous area.
2.2 Terminal arrangement
To connect external devices to the signal output terminals, the wiring requirements for the type of
protection of the compartment must also be conform to the international or national standard
involved (e.g. EN 60079-14). The terminal arrangement is shown by the following figure.
Terminal arrangement in terminal compartment
The following outputs are available for connection to external circuits (see figure above):
Current output (terminals I, I
⊥)
This circuit constitutes a passive 4-20 mA current loop and includes the HART protocol of the
communication device (choice of polarity is free).
Additional power supply or Power Booster (terminals 1L=, 0L=)
These terminals are connected to provide the 2x2 wire mode (choice of polarity is free).
Binary outputs (terminals B1, B
⊥, B2)
Terminals B1 and B ⊥ can be configured as pulse or status output through software.
Terminals B2 and B ⊥ can be configured as pulse or status output to NAMUR.
Galvanical separation of circuits
The internal electrode circuit with type of protection "EEx ib" is galvanically connected to the
aluminum signal converter housing (i.e. PE potential).
The current output, the additional power supply and the internal field current circuit are
galvanically connected to each other.
2.3 Description of the output circuits
The terminal compartment of the IFM 4042 K-EE is, with respect to the explosion protection,
available in two versions. The version can be identified by the information that is listed on the
data plate, which is mounted on the signal converter housing.
I ⊥ I B1 B ⊥ B2 1L= 0L=
current binary power booster
output outputs (additional power supply)
PE protective ground
FE functional ground