KROHNE DK 37 NEPSI Ex i - Manual (Page 8)

2
DEVICE DESCRIPTION
8
DK37/M8 - H250/M8
www.krohne.com 09/2013 - 4002616801 AD DK37 NEPSI Ex ia R01 en
The minimal permissible ambient temperature depends on the display and the built in limit
switches:
2.8 Electrical data
The electronic signal output may only be connected to intrinsically safe circuits. Depending on
the instrument design, the following maximum values apply per circuit:
Version DK37/M8E/..
Irrespective of the instrument design the following values are to be observed for each
intrinsically safe circuit in case of interconnection:
Version DK37/M8M/../K.
Depending on the built in limit switches the following values are to be observed for each
intrinsically safe circuit in case of interconnection:
The values specified for C
i
and L
i
also take into account the capacities and inductances of the
internal EMC filter.
Type Electrical built in Minimum ambient temperature
DK37/M8E/../.. Signal output 4...20 mA -20°C / -4°F
DK37/M8M/../.. SJ2-SN
SJ2-S1N
SC2-N0
-20°C / -4°F
DK37/M8M/../.. I7S2002-N -40°C / -40°F
U
i
30 VDC
I
i
100 mA
P
i
1000 mW
C
i
≈ 0
Li ≈ 0
U
i
16 VDC
I
i
25 mA
P
i
64 mW
Type of limit switch I7S2002-N
SC2-N0
SJ2-SN
SJ2-S1N
C
i
165 nF 45 nF
Li 150 µH 100 µH
AD_DK37_NEPSI_Ex_ia_R01_en_4002616801_PRT.book Page 8 Friday, September 13, 2013 8:50 AM