4
ELECTRICAL CONNECTIONS
52
OPTIFLEX 1300 C
www.krohne.com
01/2008 • 4000172301 - HB OPTIFLEX 1300 R02 en
4.3.3 Ex d
NOTE!
If the barrier has a HART
®
terminal, you can connect HART instruments directly to the barrier
without a resistor.
Figure 4-4:
HART
®
connection to the Ex i barrier without a resistor
1
Intrinsically-safe power supply
2
Zone non-Ex
3
Zone Ex
4
14...30 VDC for an output of 22mA at the terminal
5
10...30 VDC for an output of 22mA at the terminal
=
=
3
HART
4
5
Figure 4-5:
Electrical connections for an Ex d-approved instrument
1
Power supply
2
Resistor for HART
®
communication
3
Non-Ex zone
4
Ex zone
5
|U|
≤
5 V
6
20...36 VDC for an output of 22mA at the terminal
7
10...30 VDC for an output of 22mA at the terminal
4
HB_OPTIFLEX1300_EN_D4_080428.book Page 52 Tuesday, April 29, 2008 2:47 PM