Endress+Hauser PROline prowirl 72 PROFIBUS PA Documentation Technique page 24

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8
Surface temperature for devices for use in Zone 21
The surface temperature of the device may not exceed 2/3 of the ignition temperature
of a dust cloud. The maximum surface temperature must observe a safety distance of
75 K from the glow temperature of a dust layer of 5 mm.
Example: configuration of the temperature class T4 (135 °C) is suitable for dust with
an ignition temperature of 202.5 °C (1.5 x 135 °C) and a glow temperature of 210 °C
(135 °C + 75 °C).
Electrical connections
Fig. 1: Electrical connections Prowirl 72 PROFIBUS PA resp. Prowirl 73 PROFIBUS PA
A = PROFIBUS cable
B = Ground terminal in the wiring compartment (between the stripped PROFIBUS cable and the ground
terminal, the cable shielding should not exceed a length of 5 mm)
C = Terminal connector (1 = PA +; 2 = PA –)
D = Ground terminal for potential equalisation (external, only relevant for remote version)
Caution!
• Ground potential equalisation must exist between the safe and hazardous area.
• The transmitter is to be securely connected to the potential equalization system using
either the transmitter's esternal screw terminal (D), or the ground terminal (B) in the
wiring compartment.
• Between the stripped PROFIBUS cable and the ground terminal, the cable shielding
should not exceed a length of 5 mm.
• Alternatively, the sensor and the transmitter (compact version) or the connection
housing can be connected to the potential equalization system via the pipeline
when a ground connection according to regulations can be assured.
The table below contains the values that are identical for all versions, irrespective of
the type code.
Transmitter
Prowirl 72***-******D/1/2/G****H; Prowirl 73***-******D/1/2/G****H
Terminals 1 (+)
Designation PROFIBUS PA
Functional U 9...32 V DC
B
values:
I
B
P
Intrinsically safe
EEx ia or EEx ib
circuit
U
i
I
i
P
i
L
i
C
i
£
5 mm
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–
+
1 2
D
2 (–) or Terminals
Designation
Functional
values:
16 mA
≤ 1 W
Intrinsically safe
circuit
17,5 V U
500 mA I
i
5,5 W P
≤ 10 µ F
L
≤ 5 nF
C
PROline Prowirl 72/73 PROFIBUS PA
B
C
F06-73PBxxxx-11-00-00-xx-000
1 (+)
PROFIBUS PA
U 9...32 V DC
B
I
B
P
EEx ia or EEx ib
i
250 mA
i
≤ 10 µ F
i
i
Endress+Hauser
2 (–)
16 mA
≤ 1 W
24 V
1,2 W
≤ 5 nF