JUMO dTRANS p02 - 7.6 Electrical Connection in the Hazardous (Ex) Area

21
7 Installation
7.6 Electrical connection in the hazardous (Ex) area
General The appropriate regulations must be observed when making the electrical
connection; inside the area with an explosion hazard this is, in particular:
- the regulations concerning electrical equipment in areas with an explosion hazard
(Elex V)
- the regulation for the installation of electrical equipment in areas with an
explosion hazard EN 60 079-14:1997 (VDE 0165)
- EC Type Examination Certificate
7.6.1 Connection diagram “EX”
(1) Supply unit with isolating transformer for connecting a transmitter with
explosion protection
(2) Total resistance for HART
®
communicator or HART
®
modem: 250
Ω
min.
1100
Ω
max
.
The current limiting resistor which is integrated in the supply
unit must be included in this calculation.
The HART
®
modem must not be used in the hazardous area!
The supply must be intrinsically safe and must not exceed the
following maximum values:
U
i
: 30 V DC I
i
: 100 mA P
i
: 750 mW
The connection of the HART
®
communicator or the HART
®
modem is optional.
For fault-free communication, the signal circuit must be loaded
with a minimum burden of 250
Ω
. When supply isolators are used,
the burden is in most cases already integrated.
R
R
+
+
-
+
-
-
(2) +(3)
(1)
(2)
1
+
+
2
-
-
HARTTEST
Site
Control room
intrinsically
safe circuit
HART
®
communicator
intrinsically safe
HART
®
communicator
intrinsically safe
HART
®
modem
Other
units
not intrinsically safe
connections
Supply voltage
Output
RS-232-C
PC
or
notebook