ELECTRICAL CONNECTIONS
3
21
OPTIWAVE X400
www.krohne.com
10/2017 - 4006413501 - AD NEPSI OPTIWAVE x400 R01 en
3.5.2 Maximum intrinsically-safe values for the electrical circuit
3.5.3 Supply voltage
3.5.4 Electrical schematic
Output
Intrinsically-safe values for the electrical circuit
U
i
I
i
P
i
C
i
L
i
[V]
[mA]
[mW]
[nF]
[
µ
H]
4...20 mA passive
–
HART
≤
30
≤
130
≤
1000
=10
~ 0
Current output terminals
Minimum voltage at output
terminals [VDC]
Maximum voltage at output
terminals [VDC]
(Input)
12
1
30
1
1
Minimum voltage at output terminals for a current output of 21.5 mA
Figure 3-2: Electrical schematic for Ex i-approved equipment
1
Intrinsically-safe power supply
2
Non-Ex zone
3
Ex zone
4
Resistor for HART
®
communication
5
Grounding wire
–
if the electrical wire is shielded (braided wire etc.)
INFORMATION!
For applications where EPL Gb is necessary, you must connect the device to an intrinsically-safe
circuit with protection concept "ib". If the device is connected to an intrinsically-safe circuit with
protection concept "ia", the device operates with a higher level of safety.
For applications in zone 21, you must connect the device to an intrinsically-safe circuit with
protection concept "ib". If the device is connected to an intrinsically-safe circuit with protection
concept "ia", the device operates with a higher level of safety.
