KROHNE DK 46-47-48-800 ATEX II2G Ex i EN - Manual (Page 10)

4
ELECTRICAL CONNECTIONS
10
DK46 - DK800
www.krohne.com 08/2012 - 4000430903 AD DK46/800 II2G R04 en
Electrical connections
4.1 Electrical connection
The built-in intrinsically safe NAMUR limit switches in the variable area flowmeter DK.../../../..
may only be connected to isolation switching amplifiers with separated intrinsically safe circuits
to DIN 19234 with the following max. values:
Maximum values of the power supply units
When connecting to intrinsically safe circuits, take into consideration the following maximum
values per circuit as a function of the limit switch (see plate on terminal box) for the energy
stores.
4.2 Terminal assignment
Connect the built-in intrinsically safe components to terminals + / - in accordance with the
following illustration and table. Connect one limit switch to each terminal block. Take note of the
polarity indicated.
For devices with just one limit switch, the connection is on terminal 1.
Supply P
i
[mW] U
i
[V] I
i
[mA]
Type 1 34 16 25
Type 2 64 16 25
Type 3 169 16 52
Type of limit switch C
i
[nF] L
i
[µH]
RC10-14.-N0.../RC15-14.-N0... I7R2010-N***/I7R2015-N*** 210 100
RC10-14.-N3... I7R2010-NL*** 150 120
RC15-14.-N3... I7R2015-NL*** 150 70
Connection of limit switch - 2 wire NAMUR
1 Lower limit switch to terminal 1
2 Upper limit switch to terminal 2
The connection box includes an EMC filter unit.
AD_DK46_800_II2G_R04_en_430903_PRT.book Page 10 Tuesday, August 21, 2012 9:47 AM