Ex Survey According To Directive 94/9/Ec (Atex) - Siemens SITRANS F C MASSFLO MASS 6000 Ex-d Manual

SITRANS F C MASSFLO
2.3 Ex survey according
to Directive 94/9/EC
(ATEX)
4
    
2. Installation
Instrument groups
Applies to instruments used in underground mining
operations, as well as their above ground
I
operations, which can be endangered by mine gas
and/or flammable dusts.
Applies to instruments used in the remaining areas
II which can be endangered by a potentially explosive
atmosphere.
Instrument category
Definition
Instruments of this category are for use in areas
where ignitable atmospheres caused, by a
1G
1D
mixture of air and gasses, vapours or mists or by
(0) (20)
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
2G
2D
(1) mixture of air and gasses, vapours or mists or by
(21)
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
3G
3D
(2) dust/air mixtures, are not likely to exist. However,
(22)
if they do occur then in all probability, only
seldom or for short periods of time.
(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"
Type of protection
o Oil encapsulated
p Pressurized apparatus
q Powder filling
d Flameproof enclosure
e Increased safety
Explosion groups
Gases and vapours
(examples)
• Ammonia
• Acetone, aircraft fuel, benzine,
crude oil, diesel oil, ethane, ethanoic
acid, ether, gasolines, heating oil,
hexane, methane, propane
• Ethylene, isoprene, town gas
• Acetylene, carbon disulphide,
hydrogen
Ignition temperature
Maximum surface temperature
450°C
300°C
200°C
135°C
100°C
85°C
SFIDK.PS.028.Q1.02
as an example
i Intrinsic safety (ia, ib)
n Non-incentive equipment
m Encapsulation
s Special protection
Minimum
ignition
energy [mJ]
-
0.18
0.06
0.02
EN / IEC
842°F T1
572°F T2
392°F T3
275°F T4
212°F T5
185°F T6
:
II 2G E Ex ia IIC T6
EN/
IEC
IIA
IIA
IIB
IIC