bürkert 8177 Bedienungsanleitung Seite 40

9 Supplement
Ω
1000
750
500
1
250
14 16 18
Fig. 21: Voltage diagram
HART load
1
Voltage limit EEx-ia instrument
2
Voltage limit non-Ex instrument
3
Operating voltage
4
Electrical protective measures
Protection
Overvoltage category
Protection class
40
20 22 24
2
26 28 30
IP 66/IP 67
III
II
LEVEL TRANSMITTER 8177 • 4 ... 20 mA/HART
3
4
32 34 36
V