Operation In Potentially Explosive Atmospheres (Atex); Special Conditions; Identification - Beckhoff EL1904 Operating Instructions Manual

Operation
5.3 Operation in potentially explosive atmospheres
(ATEX)
5.3.1

Special conditions

Observe the special conditions for the intended use of Beckhoff fieldbus components in
potentially explosive areas (directive 94/9/EU)!
The certified components are to be installed in a suitable housing that guarantees a protection class of at
least IP54 in accordance with EN 60529! The environmental conditions during use are thereby to be taken
into account!
If the temperatures during rated operation are higher than 70 °C at the feed-in points of cables, lines or
pipes, or higher than 80°C at the wire branching points, then cables must be selected whose temperature
data correspond to the actual measured temperature values!
Observe the permissible ambient temperature range of 0 to 55 °C when using Beckhoff fieldbus
components in potentially explosive atmospheres!
Measures must be taken to protect against the rated operating voltage being exceeded by more than 40%
due to short-term interference voltages!
The individual terminals may only be unplugged or removed from the Bus Terminal system if the supply
voltage has been switched off or if a non-explosive atmosphere is ensured!
The connections of the certified components may only be connected or disconnected if the supply voltage
has been switched off or if a non-explosive atmosphere is ensured!
The fuses of the EL92xx power feed terminals may only be exchanged if the supply voltage has been
switched off or if a non-explosive atmosphere is ensured!
Address selectors and ID switches may only be adjusted if the supply voltage has been switched off or if a
non-explosive atmosphere is ensured!
The fundamental health and safety requirements are fulfilled by compliance with the following standards:
• EN 60079-0: 2006
• EN 60079-15: 2005
5.3.2

Identification

Beckhoff fieldbus components that are certified for use in potentially explosive atmospheres bear one of the
following markings:
II 3 G Ex nA IIC T4 Gc KEMA 10ATEX0075 X
Ta: 0 ... 55 °C
or
II 3 G Ex nA nC IIC T4 Gc KEMA 10ATEX0075 X
Ta: 0 ... 55 °C
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WARNING
Version: 3.0.0 EL1904