Endress+Hauser PROline 93 II2G Serie Bedienungsanleitung Seite 62

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Checking the conditions:
Consideration
≥ I
I
seff SEG
71.2 mA ≥ 54 mA
≥ 9 V
U
FG eff.
11.2 V ≥ 9 V
Final consideration:
From a purely functional point of view the bus segment shown in the example can be
operated based on the positive results. Further optimization of the network with a view
to connecting a greater number of field devices or realizing a longer line length can be
achieved by selecting the right fieldbus power supply and cable type.
Technical safety considerations
using variant Prosonic Flow 93***-***********G
Step 1 – compilation of technical values relevant to safety:
Bus power supply MTL 5053 (associated electrical apparatus)
• Nominal values:
U = 22 V
o
I = 216 mA
o
P = 1.2 W
o
Capacitance C
o
Inductance L
o
L/R
ratio
Tab. 5: External connection values of bus power supply MTL 5053 depending on temperature class
Prosonic Flow 93 (explosion protected electrical apparatus with intrinsically safe FF out-
put):
• Nominal values:
U = 30 V
i
I = 500 mA
i
P = 5.5 W
i
10 µ H
L =
i
C = 5 nF
i
Cerabar S (explosion protected electrical apparatus with intrinsically safe FF output):
• Nominal values Entity:
U = 24 V
i
I = 250 mA
i
P = 1.2 W
i
10 µ H
L =
i
C = 5 nF
i
PROline Prosonic Flow 93 FOUNDATION Fieldbus
Condition met?
Yes

Yes

Explosion group
IIC
0.165 µ F
0.32 mH
31 µ H/ Ω
IIB
1.14 µ F 4.20 µ F
3.00 mH 7.00 mH
126 µ H/ Ω 242 µ H/ Ω
Endress+Hauser
IIA