J. D. NEUHAUS JDN mini Series, Инструкции по эксплуатации и сборке

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Seite 12
T E M P E R AT U R E L I M I T F O R
E X P L O S I O N - H A Z A R D O U S D U S T S
In areas which are explosion-hazardous due to com-
bustible dusts, the surface temperature must not exceed
two-thirds of the ignition temperature in °C of the
dust/air mixture. The temperatures of surfaces on which
hazardous deposits of combustible dusts can be formed,
must not exceed the glow temperature of the relevant
dust minus 75°K. Greater safety margins are required if
the thickness of the dust layer exceeds 5 mm.
P L E A S E A L S O O B S E R V E Y O U R
CO R R E S P O N D I N G N AT I O N A L
R E G U L AT I O N S .
The corresponding surface temperatures can be derived
from the lowest values for glow and ignition tempera-
tures of dusts specified in the HVBG/BIA Report 12/97
10
“Combustion and explosion characteristics of dusts”:
Synthetic rubber, soot-containing:
Glow temperature 220° C - 75° C = 145° C max. permissible
surface temperature
Stearic acid:
Ignition temperature 190° C x 2/3 =126° C max. permis-
sible surface temperature.
powered by air !
P RO D U C T I N F O R M AT I O N
1
Guideline 94/9/EC OF the European Parliament and the Council of 23 March 1994 on the approximation of the laws
of the Member States concerning equipment and protective systems intended for use in potentially explosive atmos-
pheres
2
DIN EN 1127-1: Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts and methodology,
1997-10
3
IEC 60079-12: Electrical apparatus for explosive gas atmospheres, Part 12: Classification of mixtures of gases and
vapours with air according to their maximum experimental safe gaps and minimum igniting currents, 1978.
4
IEC 60079-20: Electrical apparatus for explosive gas atmospheres,
Part 20: Data for flammable gases and vapours relating to the use of electric apparatus, 1996-10.
5
EN 13463-1: Non-electrical devices intended for use in explosive areas - part 1: Basic methodology and requirements,
07/2009
6
DIN VDE 0165: Installation of electrical systems in areas with explosion hazard, 1991
7
Redeker, Schön: 6. Supplement to safety-related characteristic values for flammable gases and vapours, 1990
8
Nabert, Schön: Safety-related characteristic values for flammable gases and vapours, 2nd edition, 1978
9
DIN EN 50014 (VDE 0170/0171 part 1): 2000-02
Electrical apparatus for use in explosion hazardous areas: General provisions
10
HVBG/BIA report 12/97: Central association of German employer's liability associations /trade association institute
for industrial safety