7
ATEX: SUPPLEMENTARY INSTRUCTIONS
120
OPTIFLEX 1300 C
www.krohne.com
01/2008 • 4000172301 - HB OPTIFLEX 1300 R02 en
Electrical schema
CAUTION!
Make sure that you connect the load resistor to the positive side.
Figure 7-8:
Electrical schema for Ex d [ia]-approved equipment (with galvanic isolation)
Figure 7-9:
Electrical schema for Ex d [ia]-approved equipment (without galvanic isolation)
1
Galvanically-isolated power supply (use a second power supply for optional terminal 2)
2
Power supply (use a second power supply for optional terminal 2)
3
Resistor for HART
®
communication
4
Non-Ex zone
5
Ex zone
6
|U| < 5 V
4
1
1
4
6
6
HB_OPTIFLEX1300_EN_D4_080428.book Page 120 Tuesday, April 29, 2008 2:47 PM