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Physikalisch-Technische Bundesanstalt
Braunschweig und Berlin
Test Report PTB Ex .......................
External RS-485-IS fieldbus system ............. in type of protection Intrinsic Safety Ex ib IIC
Lines (loop resistance) .................................. cable type A or B acc. to EN 60079-25 with the
Note!
Specifications on the maximum permissible external reactance on the fieldbus connections of
the individual devices in the external RS-485-IS fieldbus network are not applied in this EC
Type Examination Certificate.
Type 1170-3185 NAMUR Module
Input circuit Vcc-D .......................................
(round connector X8)
Signal current circuits ................................... in type of protection Intrinsic Safety Ex ia IIC
(terminals X1 to X8)
Solenoid valves
Input circuits ................................................. in type of protection Intrinsic Safety Ex ia IIC
(terminal rows X10 to X13)
The results laid down in this test report refer exclusively to the test object and the technical documentation submitted. Test reports without
signature and seal are invalid. This test report may be reproduced unaltered only. Extracts or amendments shall require the prior approval of
Ptb57-3965 PA.doc
62
the Physikalisch-Technische Bundesanstalt.
Physikalisch-Technische Bundesanstalt – Bundesallee 100 - D 38116 Braunschweig
L
negligibly small
i
Max. value per pair of terminals:
U
=
4.2 V
i
Max. value of sum per pair of terminals:
I
=
4.8 A
i
following linear electric constants:
L'/R' ≤
15
µH/
C'
≤
250
nF/km
Braided wire diameter ≥ 0.2 mm
Concentrated reactance across the external
RS485 IS fieldbus systems are not permissible.
in-system circuit without external connection
options
Max. values per channel:
U
=
9.6 V
0
I
=
27 mA
0
P
=
66 mW
0
Linear characteristic
L
negligibly small
i
C
=
210pF
i
The relation between explosion group and external
reactances is shown in the table:
L
0
C
875 nF
0
only for connection to a certified intrinsically safe
circuit
Page 4/5
IIC
IIB
2 mH
5 mH
3 µF
EB 3965 EN
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