Safety Information For Installation In "Non-Sparking Na/Ec" And "Intrinsic Safety Ic - Siemens SITRANS Series Compact Operating Instructions

Installing/mounting
3.1 Basic safety notes
Aluminum enclosure are not permitted in mines.
The enclosure must be suitable for the application and installed to meet the applicable
regulations.
Cable entries and dummy elements must meet the same requirements.
3.1.1.2

Safety information for installation in "Non-sparking nA/ec" and "Intrinsic safety ic"

Zone 2 and 22
General installation instructions
If the enclosure is made of non-metallic materials or of painted metal, electrostatic charging
shall be avoided. For an ambient temperature ≥ 60 °C, heat resistant cables shall be used with
a rating of at least 20 K above the ambient temperature.
The enclosure shall be suitable for the application and correctly installed The maximum surface
temperature of the outer enclosure is 20 K hotter than the maximum ambient temperature.
The distance between terminals, inclusive the wires bare part, shall be at least 3 mm separated
from any earthed metal.
'TEST' connection, may only be applied when the area is safe, or if supply / output circuit and
the applied current meter are intrinsically safe.
For installation in a potentially explosive gas atmosphere, the following instructions apply:
For "Ex ic" the transmitter must be installed in an enclosure providing a degree of protection
of at least IP20 according to IEC/EN 60529 that is suitable for the application and is correctly
installed.
For "Ex nA" and "Ex ec" the transmitter must be installed in an enclosure providing a degree
of protection of at least IP54 in accordance with IEC/EN 60079-0. In addition, the enclosure
shall provide an internal pollution degree 2 or better as defined in IEC/EN 60664-1.
Cable entry devices and blanking elements shall fulfill the same requirements.
For installation in a potentially explosive dust atmosphere, 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 a metal enclosure
form B according to DIN 43729 or equivalent that provides a degree of protection of at least
IP6X according to IEC/EN 60529.
Cable entry devices and blanking elements shall fulfill the same requirements.
If the transmitter is supplied with an non-sparking signal "nA/ec", or interfaces a non sparking
signal, the transmitter shall be mounted in an enclosure, providing a degree of protection of at
least IP6X according to IEC/ EN 60529, and in conformance with type of protection Ex t.
Cable entry devices and blanking elements shall fulfill the same requirements.
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SITRANS TH320/TH420/TR320/TR420/TF320/TF420
Compact Operating Instructions, 03/2018, A5E41865021-AA