09-2018
file: ISAFE3-OperationManual_EN_DE.R4.VEXH.docx
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Vallen ISAFE3 Operation Manual - Operation Manual
5.4
Environmental conditions for SISO3
This chapter describes relevant information applicable for selection or construction of the
housing of a number of SISO3 modules.
SISO3 modules must be installed into an outer case, where SISO3 modules can simply be
clamped-on to a DIN rail.
The DIN rail must be connected to earth. SISO
3 connects earth from DIN rail over 220 kΩ to the
shield and minus of the intrinsically safe circuit to ensure electro static discharge when cable to
ISAS3 is interrupted.
Depending on the environment of SISO3, different requirements apply.
Environment
of SISO3
Pollution
Degree
Requirement on outer case for SISO3
Non-
hazardous
2 (or 1)
Dry environment. EN 60079-11:2007 / F.2 applies. Case shall
be metallic and provide sufficient space and safe hold of
SISO3 modules and cabling. Internal DIN rail needed for
mounting and earth connection of SISO3 modules. Outer case
shall be connected to earth potential. Ex-label not required for
the case. Cable entry for intrinsically safe circuits to be labeled
"Ex-i"
Requirements are met by HISO3-xx products
Non
hazardous
> 2
As before. The outer case must be of protection class IP54
(IEC60529)
Requirements are met by HISO3-xx products.
Hazardous
area of zone 2
2 (or 1)
As before. The outer case must undergo mechanical tests (7
Joule impact test, IP54 test) to be performed according to
EN 60079-0:2009 / 6.2 and 26.4.2, 26.4.4, 26.4.5, if product is
not an approved Ex-component.
Ex-Label (same as SISO3) required.
Additional requirements on the outer case of SISO3, if installed in a hazardous area of zone 2:
EN 60079-14:2008 / 6
Protection against dangerous sparks
EN 60079-14:2008 / 9.3
Cabling
EN 60079-14:2008 / 12
Additional requirements for intrinsically safe installations
Depending on the application, other standards may need consideration.
