ATEX: SUPPLEMENTARY INSTRUCTIONS
7
121
OPTIFLEX 1300 C
www.krohne.com
01/2008 • 4000172301 - HB OPTIFLEX 1300 R02 en
7.3.6 EEx nA equipment
How to connect the electrical cables
•
Use the electrical connection procedure in the Handbook.
•
If you use only one entry, seal the other one with a plug.
Supply voltage
Electrical schema
INFORMATION!
•
Cable entries are supplied on customer demand. If you supply the cable entries, this part
must have a degree of ingress protection IP
≥
54 (EN 60529).
Terminal
Minimum voltage at terminal [VDC] Maximum voltage at terminal [VDC]
1 (U
S1
)
14
1
30
1
2 (U
S2
)
2
10
1
30
1
1
for an output of 22 mA
2
use a second power supply. This power supply energizes terminal 2 only.
Figure 7-10:
Electrical schema for Ex nA-approved equipment
1
Power supply (use a second power supply for optional terminal 2)
2
Resistor for HART
®
communication
3
Non-Ex zone
4
Ex zone
3
1
1
2
4
HB_OPTIFLEX1300_EN_D4_080428.book Page 121 Tuesday, April 29, 2008 2:47 PM