Heinrichs Messtechnik GmbH
EX-Supplementary Operating Manual
HPC Mass Flow Meter
Page 7 of 20
3
General information about explosion protection
Ac
c.
Di
rec
tiv
e
94
/9
/E
C (
ATEX)
Example designation
0158
II 2G Ex ia IIC T6 Gb
Equipment groups
I
Equipment group I applies to equipment intended for use in underground
parts of mines as well as those parts of surface installations of such mines
endangered by firedamp and/or combustible dust.
II
Equipment group II applies to equipment intended for use in other places
liable to be endangered by explosive atmospheres. This group is subdivided
into three categories.
Equipment category
Gas
Dust
Definition
1G
(0)
1 D
(20)
Equipment in this category is intended for use in areas in which
explosive atmospheres caused by mixtures of air and gases,
vapours or mists or by air/dust mixtures are present continuously,
for long periods or frequently.
2 G
(1)
2 D
(21)
Equipment in this category is intended for use in areas in which
explosive atmospheres caused by gases, vapours, mists or air/dust
mixtures are likely to occur.
3G
(2)
3D
(22)
Equipment in this category is intended for use in areas in which
explosive atmospheres caused by gases, vapours, mists, or air/dust
mixtures are unlikely to occur or, if they do occur, are likely to do so
only infrequently and for a short period only.
(The numbers in round brackets correspond to the IEC Zones.)
Ac
c. E
N 60
07
9-
0 f
f / I
EC 6
00
79
-0
ff
Ex = Explosion-proof electrical equipment
Types of protection
General requirements
IEC 60079-0
„d“
Flameproof enclosure
IEC 60079-1
„e“
Increased safety
IEC 60079-7
„i“
Intrinsic safety (ia, ib)
IEC 60079-11
„t"
Equipment dust ignition protection by
enclosure "t" (ta, tb or tc)
EN 60079-31
Explosion groups
Gases and vapours
IIA
Acetone, benzene, fuel oil, ethanoic acid
IIB
City gas, ethylene, isoprene
IIC
Acetylene, hydrogen, carbon bisulphide
Dust Atmospheres
IIIA
Fibers and flyings
IIIB
Non-conductive dusts
IIIC
Metal dusts
Temperature classes
Maximum surface temperature
Temperature class
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
Equipment protection level,
EPL
Gases: Ga, Gb oder Gc
Dust: Da, Db or Dc
Explosion protection designations [square brackets] refer to “Related electrical equipment or circuits.”
