Siemens MAG 1100, Operating Instructions Manual, Page: 106 / 665

31
SITRANS F M
3. Project guidance
3.7 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 IIB T3-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
°
F T1
300
°
C 572
°
F T2
200
°
C 392
°
F T3
135
°
C 275
°
F T4
100
°
C 212
°
F T5
85
°
C 185
°
F T6
I
II
EN 50014
D
irect
ive 94/9/EC (ATEX)
Definition
1G
(0)
Labell
ing
w
ith gases
Labell
ing
w
ith dusts
1D
(20)
2G
(1)
2D
(21)
3G
(2)
3D
(22)