Endress+Hauser PROline prowirl 72 Documentation Technique page 13

XA069D/06/a3/12.03
50103831
FM+SGML 6.0
PROline prowirl 72 / prowirl 73
II3G
Ex documentation for the BA 084D (Prowirl 72 ) and
BA 094D (Prowirl 73) operating instructions
according to Directive 94/9/EC (ATEX)
Instrument groups
applies to instruments used in underground mining operations, as well as
their above ground operations, which can be endangered by mine gas
I
and/or flammable dusts.
applies to instruments used in the remaining areas which can be
II
endangered by a potentially explosive atmosphere.
Instrument category
Instruments of this category are for use in areas where ignitable
1G 1D
atmospheres caused by a mixture of air and gases, vapours or mists
or by dust/air mixtures, can exist all of the time or for long periods of
(0) (20)
time or else frequently.
Instruments of this category are for use in areas where ignitable
2G 2D
atmospheres caused by a mixture of air and gases, vapours or mists
(1) (21)
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 gases, vapours or mists
3G 3D
or by dust/air mixtures, are not likely to exist. However, if they do
(2) (22)
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 electrical equipment = Ex
Type of protection
EN
nA
non-sparking apparatus
nR restricted breathing
nL low energy apparatus
nP apparatus with simple
pressurised encapsulation
Explosion groups
Gases and vapours
EN
IEC (examples)
- Ammonia
IIA
- Acetone, aircraft fuel, benzene, crude oil,
IIA
diesel oil, ethane, ethanoic acid, ether, gaso-
lines, heating oil, hexane, methane, propane
- Ethylene, isoprene, town gas
IIB
- Acetylene, carbon disulphide, hydrogen
IIC
Temperature class
EN / IEC
T1 450 °C
T2 300 °C
T3 200 °C
T4 135 °C
T5 100 °C
T6 85 °C
as an example:
Definition
EN
nC
sparking apparatus in which the
contacts are protected appropriately
but not, however, through restricted
breathing, low energy or pressurised
encapsulation
Minimum
ignition
energy [mJ]
--
0,18
0,06
0,02
Maximum surface temperature
842 °F
572 °F
392 °F
275 °F
212 °F
185 °F
<
0
II 3G E Ex nC IIB T4