GasZone

0

1

2

DustZone

20

21

22

Equipment Group and CategoryDescription Equipment Code Suitable zones EN Standard Concept of

Gas Dust Gas Dust Gas Dust protection

Intrinsic safety Ex ia Ex iaD 0, 1, 2 20,21,22 EN 50020/39* EN 61241-11 'ia' (EN 60079-11)

Intrinsic safety Ex ib Ex ibD 1, 2 21,22 EN 50020/39* EN 61241-11 'ib' (EN 60079-11)

Type - n Ex nL 2 EN 60079-15(Energy limitation)

Flameproof Ex d 1, 2 EN 50018* protection (EN 60079-1)

Sand / powder Ex q 1, 2 EN 50017* (quartz) filling (EN 60079-5)

Type - n Ex nC 2 EN 60079-15 (Enclosed break)

Pressurized Ex p Ex pD 1, 2 21,22 EN 50016* EN 61241-4 protection EN 60079-2

Encapsulation Ex ma Ex ma/D 0, 1, 2 20 EN 50028* EN 61241-18 (EN 60079-18)

Encapsulation Ex mb Ex mb/D 1, 2 21,22 EN 50028* EN 61241-18 (EN 60079-18)

Oil immersion Ex o 1, 2 EN 50015* (EN 60079-6)

Type - n Ex nR 2 EN 60079-15(Restricted breathing)

Type - n Ex nP 2 EN 60079-15(Pressurisation)

Increased safety Ex e 1, 2 EN 60079-7

Type - n Ex nA 2 EN 60079-15(Non-sparking)

Enclosure Ex tD 20,21,22 EN 61241-1

Gas/Vapour Apparatus Temperatureclass Group Class

Acetic Acid llA T1

Acetone llA T1

Acetylene llC T2

Ammonia llA T1

Butane llA T2

Cyclohexane llA T3

Ethanol (ethyl alcohol) llA T2

Ethylene llB T2

Hydrogen llC T1

Kerosene llA T3

Methane (natural gas) llA T1(non-mining)

Methanol llA T2(methyl alcohol)

Methyl ethyl ketone llB T2(MEK)

Propane llA T1

Propan-1-ol llB T2(n-propyl alcohol)

Propan-2-ol llA T2(iso-propyl alcohol)

Tetrahydrofuran (THF) llB T3

Toluene llA T1

Xylene llA T1

Dusts Typical Ignition Temp. (°C) Cloud Layer

Aluminium 590 >450

Coal dust (lignite) 380 225

Flour 490 340

Grain dust 510 300

Methyl cellulose 420 320

Phenolic resin 530 >450

Polythene 420 (melts)

PVC 700 >450

Soot 810 570

Starch 460 435

Sugar 490 460

Ignition Temperaturesfor Combustible Dusts

IP Protection ClassApparatus Groups and Temperature Class

EquipmentCategory

1

2

3

Group

II

II

II

Hazardous Area Characteristics

Present continuously or long periods

or frequently (>1000 hours/year)

Likely to occur in normal operation

occasionally (>10 <1000 hours/year)

Not likely to occur in normal opera-

tion or infrequently and for short

periods (<10 hours/year)

First Digit – Solids

0 No protection

1 Protected against solids objects over 50mm (e.g.

accidental touch by hands)

2 Protected against solids objects over 12mm (e.g. fingers)

3 Protected against solids objects over 2.5mm (e.g. tools and wires)

4 Protected against solids objects over 1mm (e.g. tools, wires, small wires)

5 Protected against dust – limited ingress (no harm- ful deposit)

6 Totally protected against dust

Second Digit – Fluids

0 No protection

1 Protected against vertically falling drops of water

2 Protected against direct sprays up to 15° from the vertical

3 Protected against direct sprays up to 60° from the vertical

4 Protected against sprays from all directions - limited ingress permitted

5 Protected against low pressure jets if water from all directions – limited ingress permitted

6 Protected against strong jets of water e.g. for use on shipdecks – limited ingress permitted

7 Protected against effects of temporary immersion between 15cm and 1m. Duration of test 30 min.

8 Protected against long periods of immersion under pressure

T-Class Hazards which will not ignite below

T1 450°C

T2 300°C

T3 200°C

T4 135°C

T5 100°C

T6 85°C

Temperature Classification

Equipment T class approval is based on use in an ambient of -20°C to +40°C unless otherwise stated (ie. T amb. = 35°C).

The T-Class on the equipment states that the equipment will not provide an ignition capable surface hotter than the temperature represented by the stated T-Class. Therefore equipment to be installed in hazardous areas where the hazard has temperature class T6 must not get hotter than 85°C. For equip-ment in hazardous areas, the higher the T-Number the less hot the surface tempera-ture will get.

* Soon to be replaced by standard in bracket

Ex d [ ib ] IIC T6...T3

Protection Concept

CE marking & Specific Defines suitability Defines suitability number of marking of Equipment Equipment of use of Group II of use of Group II notified body explosive Groups Category equipment in equipment in responsible for protection gas atmospheres dust atmospheres production

0344 II 2 G D

ATEX Marking

Certification Code (Gas)

www.yokogawa.com/eu

YOKOGAWA EUROPE B.V., Databankweg 20, 3821 AL Amersfoort, THE NETHERLANDS

Other ATEX certified devices: RAMC RAKD digitalYEWFLO ADMAG AXF SE ADMAG AXF RXF

ROTAMASS

RAMC

Limit theenergy ofsparks andsurfacetemperatures

Contain theexplosion,quench theflame

Keep theflammablegas out

No arcs,sparks orhot surfaces

Protection byenclosure

Explosion Protection Gas Temperature

protected Concepts Groups Classification

equipment

DIODE SAFETY BARRIER Um : 250Vac/dc

KEMA 02 ATEX 2183 XII 2G Ex d [ib] IIC T6…T3 or Ex de [ib] IIC T6…T3II 2D Ex tD A21 IP6x T150°C

TEMP. CLASS T6 T5 T4 T3 PROCESS TEMP. 65 80 115 150°C

ENCLOSURE: IP67SEE CERTIFICATE FOR DATA

Made in Germany by ROTA YOKOGAWA, Rheinstraße 8, D-79664 Wehr 22-5479.31/C

0344WAIT 15 MIN. AFTER POWER-DISCONNECTIONBEFORE OPENINGTHE ENCLOSURE.

WARNING

N200

see:InstructionManual

PS is the max. pressure at room temperatureTS are the process temperature limits

ATEX Explained

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