Ametek Drexelbrook DR7000 Series Руководство по дополнительным инструкциям - Страница 14
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DR7000 SERIES
3.5.2 Maximum intrinsically-safe values for the electrical circuit
INFORMATION!
The optional second output is galvanically isolated from the main power supply, output 1 and
parts of the device that are grounded.
Level transmitter with the 4...20 mA output option (output terminal 1 or 2)
≤30 V
• U
i
≤300 mA
• I
i
≤1 W
• P
i
• C
=30 nF
i
• L
=0.2 mH
i
3.5.3 Supply voltage
Level transmitter with the 4...20 mA output option
Current output terminal
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.
3.5.4 Electrical schema
Figure 3-2: Electrical schema for Ex i-approved equipment with the 4...20 mA output option
1 Intrinsically-safe power supply (use a second power supply for optional terminal 2 if the device has two 4...20 mA out-
puts)
2 Non-Ex zone
3 Ex zone
4 Resistor for HART
DR7000-LM IECEX, EDO# 9-10-104, Issue# 1
1 (U
)
S1
2 (U
)
2
S2
®
communication
ELECTRICAL CONNECTIONS
Minimum voltage at output
terminal [VDC]
www.drexelbrook.com
Maximum voltage at output
terminal [VDC]
14
1
10
1
3
30
1
30
1
14