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BKI 11 ATEX 0012 X
5.2.
W
IRING
The instrument operates from 12.5 … 36 V galvanic isolated and not grounded DC power supply in two wire system. (For Ex version: 12.5 … 30 V DC!)
Sum of the resistance of the equipped instruments, between the transmitter and the power supply, mainly depends on the supply voltage of power supply applied,
and the overall resistance value cannot exceed 1200 ohms. In case of using HART interface – to achieve proper communication between the transmitter’s interface
and the power-supply – a minimal 250 ohms resistance should be maintained within the network.
5.2.1.
Wiring of Compact instruments
The instrument should be wired with shielded cable led through the cable gland. The wiring of
cables can be done after removing the cover of the instrument and the SAP display unit.
Make sure that the power supply is turned off at the source.
After removal of the cover of the housing and taking the display module (if any) out,
the wiring cables can be connected. (Recommended cable: shielded, two-wire, with
0.5 ... 1.5 mm
2
cross section. Connect shielding to grounding by the inner or outer
grounding screw first.
Switch on the unit. After switching of the unit, necessary programming can be done.
After the wiring, adjustment and programming, check proper sealing and close the
cover carefully.
IMPORTANT
: - The housing of the transmitter should be grounded to the EPH network.
Resistance of the EPH network should be R
2 ohm measured from the neutral. Shielding of
the cable should be grounded at the control room side to the EP network. To avoid disturbing
noises, keep away of closeness to high-voltage cables. Especially critical can be the inductive
couplings of harmonics (which are present at frequency converter control) because even cable
shielding does not supply effective protection against these cases.
RELAY
Display unit
connector
Loop current
measuring connector
4...20 mA loop current
and supply (HART)
GND
1/2” NPT
1/2” NPT
M20x1,5
M20x1,5
I
2 3 4 5 6
C2
5
4
6
C1
(Only normal
version)
2 3
1 2
U
1
!
The instrument may be damaged by electrostatic discharge (ESD) via its terminal, thus apply the precautions commonly used to avoid electrostatic
discharge e.g. by touching a properly grounded point before removing the cover of the enclosure.