PR electronics Hart 7 Manuel De Produit page 38

For installation in a potentialy explosive gas atmosphere, the following
instructions apply:
The transmitter shall be installed in an enclosure providing a degree of protection of not
less than IP54 in accordance with IEC 60079-0, which is suitable for the application
and correctly installed, e.g. in an enclosure that is in type of protection Ex n or Ex e.
Additionally, the area inside the enclosure shall be pollution degree 2 or better, as
defined in IEC 60664-1.
Cable entry devices and blanking elements shall fulfill the same requirements.
For installation in a potentially explosive dust atmposphere, the following
instructions apply:
If the transmitter is supplied with an intrinsically safe signal "ic" and interfaces an
intrinsically safe signal "ic" (e.g. a passive device) , the transmitter shall be mounted in
an enclosure that provides a degree of protection of at least IP54 according to
IEC60079-0.
Cable entry devices and blanking elements shall fulfill the same requirements.
If the transmitter is supplied with an non-sparking signal "nA", or interfaces a non
sparking signal, the transmitter shall be mounted in an enclosure, providing a degree of
protection of at least IP54 according to IEC60079-0, and in conformance with type of
protection Ex tD, or Ex t.
Cable entry devices and blanking elements shall fulfill the same requirements.
The surface temperature "T" of the enclosure, for a dust layer with a maximum
thickness of 5 mm, is the ambient temperature +20 K.
38 6437V102-FR