SITRANS F C MASSFLO
4
SFIDK.PS.028.Q1.02
2. Installation
2.3 Ex survey according
to Directive 94/9/EC
(ATEX)
Applies to instruments used in underground mining
operations, as well as their above ground
operations, which can be endangered by mine gas
and/or flammable dusts.
Instrument groups
Applies to instruments used in the remaining areas
which can be endangered by a potentially explosive
atmosphere.
Instruments of this category are for use in areas
where ignitable atmospheres caused, by a
mixture of air and gasses, vapours or mists or by
dust/air mixtures, can exist all of the time or for
long periods of time or else frequently.
Instruments of this category are for use in areas
where ignitable atmospheres caused, by a
mixture of air and gasses, vapours or mists or by
dust/air mixtures, can exist some of the time.
Instruments of this category are for use in areas
where ignitable atmospheres caused, by a
mixture of air and gasses, vapours or mists or by
dust/air mixtures, are not likely to exist. However,
if they do occur then in all probability, only
seldom or for short periods of time.
Instrument category
(The figures in brackets refer to IEC)
Built according to European norm = E
Explosion protected electrial equipment = Ex
Ex protection labelling in square brackets refers to "Associated electrical equipment"
as an example
:
II 2G E Ex ia IIC T6
Type of protection
o Oil encapsulated i Intrinsic safety (ia, ib)
p Pressurized apparatus n Non-incentive equipment
q Powder filling m Encapsulation
d Flameproof enclosure s Special protection
e Increased safety
Explosion groups
Gases and vapours Minimum EN/
(examples) ignition IEC
energy [mJ]
• Ammonia - IIA
• Acetone, aircraft fuel, benzine,
crude oil, diesel oil, ethane, ethanoic
acid, ether, gasolines, heating oil,
hexane, methane, propane 0.18 IIA
• Ethylene, isoprene, town gas 0.06 IIB
• Acetylene, carbon disulphide,
hydrogen 0.02 IIC
Ignition temperature
Maximum surface temperature EN / IEC
450°C 842°FT1
300°C 572°FT2
200°C 392°FT3
135°C 275°FT4
100°C 212°FT5
85°C 185°FT6
I
II
EN 50014 Directive 94/9/EC (ATEX)
Definition
1G
(0)
Labelling
with gases
Labelling
with dusts
1D
(20)
2G
(1)
2D
(21)
3G
(2)
3D
(22)
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