ATEX: SUPPLEMENTARY INSTRUCTIONS
7
117
OPTIFLEX 1300 C
www.krohne.com
01/2008 • 4000172301 - HB OPTIFLEX 1300 R02 en
•
Use the electrical connection procedure in the Handbook.
•
If possible, use galvanically-isolated equipment.
•
Supply the EEx i equipment connected to the instrument. Use only certified intrinsically-safe
equipment.
•
Connect only to separate certified, intrinsically-safe circuits. Make sure that the electrical
circuit characteristics are not more than the values below.
Maximum intrinsically-safe values for the electrical circuit
•
U
i
≤
30 V
•
I
i
≤
300 mA
•
P
i
≤
1 W
•
C
i
=30 nF
•
L
i
=0.2 mH
Supply voltage
Electrical schema
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 7-6:
Electrical schema for Ex i-approved equipment
1
Intrinsically-safe power supply (use second power supply for optional terminal 2)
2
Non-Ex zone
3
Ex zone
4
Resistor for HART
®
communication
=
=
3
Ex i
HART
1
1
HB_OPTIFLEX1300_EN_D4_080428.book Page 117 Tuesday, April 29, 2008 2:47 PM