KROHNE OPTIWAVE 7300 IECEx - Manual (Page 16)

3
ELECTRICAL CONNECTIONS
16
OPTIWAVE 7300 C
www.krohne.com 10/2010 - 4000176502 - AD IECEX OPTIWAVE7300 R02 en
3.6.3 Supply voltage
3.6.4 Electrical schema
CAUTION!
Do not ground the positive connection.
Current output terminal Minimum voltage at output
terminal [VDC]
Maximum voltage at output
terminal [VDC]
1 (U
S1
) 20 1 36 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.
CAUTION!
Make sure that you connect the load resistor to the positive side.
Figure 3-4: Electrical schema for Ex d[ia] / Ex tD[iaD]-approved equipment (with galvanic isolation)
Figure 3-5: Electrical schema for Ex d[ia] / Ex tD[iaD]-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