KROHNE OPTIWAVE 7300C ATEX EN - Manual (Page 20)

3
ELECTRICAL CONNECTIONS
20
OPTIWAVE 7300 C
www.krohne.com 06/2010 - 4000091504 - AD ATEX OPTIWAVE 7300 R06 en
3.7 Ex nA equipment
3.7.1 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.
3.7.2 Supply voltage
3.7.3 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).
Current output terminal Minimum voltage at output
terminal [VDC]
Maximum voltage at output
terminal [VDC]
1 (U
S1
) 14 1 30 1
2 (U
S2
) 2 10 1 30 1
1 Minimum voltage at output terminal for a current output of 22 mA
2 Optional. Use a second power supply. This power supply energizes current output terminal 2 only.
Figure 3-7: 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