Endress+Hauser PROline prosonic flow 93 II2 GD Mode D'emploi page 71

PROline Prosonic Flow 93 FOUNDATION Fieldbus
Endress+Hauser
The permissible ambient temperature may be considered either individually for each
device at the respective place of installation, or specified uniformly for the bus segment
as a whole. In the latter case the lowest value of the ambient temperature applies.
Required temperature class
T6
In the next step is the verification of whether the installed bus components fulfil the
conditions and limit values set in the FISCO model. This is simplified by ensuring the
bus components correspond to the FISCO model. A detailed consideration of the
safety-relevant nominal values is then not necessary.
Do bus components correspond to the
FISCO model?
Power Repeater KLD2-PR-Ex1.IEC1
Prosonic Flow 93
Cerabar S
Fieldbus connection KMD0-FT-Ex
The following conditions have been applied to the bus cable and network structure:
Bus cable:
Values
R'
C'
L'
Bus cable type A
R' = 24 Ω/km
C' = 82 nF/km
L' = 623 µH/km
Network structure:
Consideration
Cable length including drop
cables
L = 660 m
SEG
Drop cable length
Final consideration:
For the example shown, intrinsic safety according to the FISCO model can be proven.
Intrinsically safe equipment
Cerabar S
Prosonic Flow 93
Condition met?
✓
Yes
✓
Yes
✓
Yes
✓
Yes
Condition Limits acc. FISCO model
> 15 Ω/km
150 Ω/km
<
>
80 nF/km
< 200 nF/km
>
400 µH/km
< 1000 µH/km
Condition Limits acc. FISCO model
≤
1000 m
≤
1000 m
≤
30 m
<
Maximum ambient temperature
40 °C
50 °C
(at 80 °C medium temperature)
Condition met?
✓
Yes
Condition met?
✓
Yes
✓
Yes
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