Atex Intrinsic Safety - RayTek TX Operating Instructions Manual

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5.2 ATEX Intrinsic Safety

The Smart unit is available with Intrinsic Safety rated as:
II 2G Ex ib IIC T4 Gb for -20°C < T
II 2D Ex ib IIIC T135°C Db IP65 for -20°C < T
The required power supply barrier for the unit must be ordered separately.
This intrinsically safe unit is available with a water-cooled housing. The water cooled housing can
provide a cooler, more stable operating environment for the electronics but does not allow for approved
IS operation when external ambient conditions are above 70°C (158°F).
The recommended power supply barrier for the unit consists, in its simplest form, of two parts from the
CONTRANS I series, manufactured by ABB Automation (formerly Hartmann & Braun):

XXXAOIS2 – Intrinsically Safe isolating Driver, Part # V17151-620

Din Rail mounted Sockets:
XXXAOIS1 – socket for one driver, with integrated power supply for input voltages of 95 to
253 VAC (V17111-130)
XXXAOIS6 – socket for one driver, with integrated power supply for input voltages of 19 to
33 VDC (V17111-120)
XXXAOIS3 – socket for up to eight drivers (V17111-251)
XXXAOIS4 – socket for up to 16 drivers (V17111-351)
The CONTRANS I interface modules are a series of driver modules, power supplies, and backplanes,
all of which can be intermixed to provide the best solution for a specific application. The recommended
solution, consisting of a single intrinsically safe isolating module and a single power supply socket, is
only one of several combinations possible.
Units with Intrinsic Safety (IS) rating are also available made from stainless steel.
The metallic enclosure of the intrinsically safe unit is not earthed by installation. At
least one of the following safety measures must be met to minimize the danger of
electrostatic charges:


Please also consider section 9.4
28
info@Raytek-Direct.com
< 70°C (-4°F < T
Ambient
Explosion critical area
Figure 19: Intrinsic Safety Installation (example)
Earth grounding of the cable shield
Installing the unit's metallic enclosure on an earth grounded mounting bracket
or on any other grounded bases
ATEX Certificate of
< 158°F)
Ambient
< 70°C (-4°F < T
Ambient
Socket
Isolating Driver
U = 22 V
i
I = 30 mA
i
P = 660 mW
i
L = 0,17 mH
i
C = 16 nF
i
Conformity, page 47.
Rev. O7 07/2017
< 158°F)
Ambient
Power
HART
Adapter
TX
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