GENERAL INFORMATIONS |
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Catalogue explosion-proof systems|
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EEx An electric apparatus witch have to use in explosive atmosphere,have to be equipped with a marking according to Standard EN 50014, as example type: EEx m IIT4,with following meaning:EEx
STANDARD IDENTIFICATION TYPE OF PROTECTION d: box explosion proof (EN50018) e: safety raised (EN50019) i: intrinsic safety "ia" "ib" (EN50020) m: encapsulation (EN50028) o: Oil immersion (EN50015) p: Pressure (EN50016) q: dust -proof (EN50017) II GROUPS OF APPARATUS This apparatus identifies groups of apparatus,divided as following: I: Electric apparatus to use in mines where it is risk of fire; II Electric apparatus to use in places with explosive atmosphere,different by mines Type of protection "d" included in class IIB,can be related with symbol fixed for a specific gas mixture of group IIC,for example H2(hydrogen).in this case certify of compiance will be:EEx d IIB + H2 .T4 CLASS OF TEMPERATURE This symbol identifies class of temperature,as following: Class of temperature are founded on highest superficial temperature reched on the whole surface or part of electric apparatus working in worst contitions and to be probably reason of ignition of explovive atmosphere.see following diagram. |
ELECTRIC APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES
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Symbol |
Zone |
Description |
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0 |
1 |
2 |
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| "d" |
not |
yes |
yes |
Refers to an electric apparatus whose part potentially explosive are closed in an explosion-proof container. This box will be resist to pressure caused by explosion of a explosive mixture,and it must to avoid that explosin it exend to explosive atmosphere of environment. Refers to electric apparatus whose potentially explosive parts are contained in a explosion-proof container. This box will be resist to pressure created by explosion in its internal area of a explosive mixture,and must to avoid that the explosion exend itself to explosive atmosphere of environment. |
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| "e" |
not |
yes |
yes |
Refers to electric apparatus with an high safety coefficient.this apparatus never reaches overly high temperature,and in normal use conditions it can not develop neither internally nor externally sparks and arc. |
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"i" |
"ia" |
yes |
yes |
yes |
Refers to circuits wherein sparks or high temperature,if created in conditions specified by standard rules (normal or alternative operational conditions),can not generate lighting of explosive atmosphere. |
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"ib" |
not |
yes |
yes |
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"m" |
not |
yes |
yes |
Refers to a special insulating wherein parts of electric apparatus,that can be generate the lighting of explosive atmosphere with a spark or for a warming,are incapsulated in a mixture in order to protect explosive atmosphere. |
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"o" |
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Refers to electric apparatus dipped in oil. |
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"p" |
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Pressurizazion is mantained against atmosphere by means of an inert gas. |
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"q" |
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refers to container filled with dust. | ||
APPARATI ELETTRICI PER ATMOSFERE POTENZIALMENTE ESPLOSIVE ELECTRIC APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES
GAS GROUPS AND CLASS OF TEMPERATURES
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Group |
Gas |
Temperature |
classof temperature |
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ignition ('C) (1) |
T1 |
T2 |
T3 |
T4 |
T5 |
T6 |
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I |
Methane(Grisou) |
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A |
Acetone Methane(CH4) Propane |
540 |
yes |
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II (2) |
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n-butane |
365 |
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yes |
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hydrogen sulfide n-esane |
270 |
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yes |
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Acetaldehyde |
140 |
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yes |
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Nitril Etilic |
90 |
yes |
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B |
ethylene oxide |
425 |
yes |
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C |
Acetylene (C2H2) carbon disulfide (CS2) Hydrogen |
305 |
yes |
yes |
yes |
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Group I : mine
Group II: place different by mines but with fire risk
1) : Temperature of warm surface able to light a gas mixure
(2) : Certified products IIB can be used as equipments of group IIA.Similary certified products IIC can be used as equipments of groups IIA e IIB
CLASS OF TEMPERATURE
Group I :Temperatures </= a 150 ‘C o </=450 ‘C ,.function of carbon dust accumulation on apparatus.
| Class of Temperature | Max Temp. of surface('C) (3) | sparking Temperature ('C) (4) |
| T1 | 450 | >450 |
| T2 | 300 | >300 |
| T3 | 200 | >200 |
| T4 | 135 | >135 |
| T5 | 100 | >100 |
| T6 | 85 | >85 |
Group II:
(3): ambient temperature must not exeed + 40’C
(4): ignition gas temperature must more high than maximum suface's temperature.in pratice is hold from 10% to 20% of safety limit between ignition temperature and ambient temperature.
Technical specifications
On customer demand,all electrovalve,shown in this catalogue can be equipped with control coil explosion-proof,certified
CENELEC, ATEX, FM, CSA, SAA, with following type:
EEx d :
- Tropical coil for impregnation,encapsulated for in nylon-glass,with magnetic circuit incorporated,insulating class F,and copper wire of wrapping in class H
- Complete separation between wrapping and fluid that cross electric valve.
- Watertight Cover coil IP 65 in light alloy with epossidic painting,or on demand Stainless Steel AISI 316L with epossidic painting.
- Incorporated electric terminal.
- Class temperature T6 o T5 on demand
- Coil group adjustable on 360°
- direction of assembly: whatever.
- Manual command on demand
- Class of protection: EEx-d IIB ; EEx-d IIC
- Voltage : 12, 24, 48, 110, 220 VAC /DC- 50/60 Hz
- Max Power absorbed: Vac 11 VA; Vdc 11 W
- Temperature: -30 ; + 80°C;
EEx ia:
- Encapsulated Coil in nylon-glass,insulating class F,and copper wire of wrapping in class H
- Complete separation between wrapping and fluid that cross electric valve.
- Class temperature T6 o T5 on demand
- Coil group adjustable on 360°
- direction of assembly: whatever.
- Manual command on demand
- Class of protection: EEx-d IIB ; EEx-d IIC
- voltage: 12, 24, 48, 110, 220 VAC /DC- 50/60 Hz
- Max Power absorbed: Vac 11 VA; Vdc 11 W
- Temperature: -30 ; + 80°C;
EEx m:
- Encapsuled Coil for in nylon-glass,with magnetic circuit incorporated,insulating class F,and copper wire of wrapping in class H