The chemical interaction of dust and gas in prestellar cores
Zone _ _ Gas Dust Element 0 = gas 2 = dust Risk 0 = high 1 = medium 2 = low.
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Transcript of Zone _ _ Gas Dust Element 0 = gas 2 = dust Risk 0 = high 1 = medium 2 = low.
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Zone _ _
Gas Dust
Element0 = gas2 = dust
Risk0 = high1 = medium2 = low
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Zone 00
Zone 20
High
1
Zone 01
Zone 21
Medium
2
Zone 02
Zone 22
Low
3
Gas
Dust
RiskAdmitted
fixture cathegory
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Zone 00
Zone 20
Zone 01
Zone 21
Zone 02
Zone 22
Gas
Dust
Cathegory3
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Zone 00
Zone 20
Zone 01
Zone 21
Zone 02
Zone 22
Gas
Dust
Manufacturer’scertificate
Third party certificate
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Zone 02Zone 22
Wood Industry Chemical Ind.
PharmaceuticalFood Industry
Paint plants
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+ +
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Group II Cat 3G Ex “nA” IIB T4
Group II Cat 3D Ex “tD” A22 T6
ZONE 02
ZONE 22
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Group II Cat 3G Ex “nA” IIB T4
Group II Cat 3D Ex “tD” A22 T6
ZONE 02
ZONE 22Group I =
minesGroup II =all the rest
Cathegory 3 fixtureG=GasD=Dust
Protection type
“nA”=gas“tD”=dust
Test method(IIB gas)(tD dust) Temperature
Class
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