可燃性ガスの発火度および爆発等級の区分
Example of Symbols
Increased - safety Structure
The lighting unit is structured to emphasize greater airtight safety and temperature rise and prevent an accidentally generated explosive gas from entering into the interior of the lighting unit or such a gas should happen to contact the high - temperature section of the unit.
| 発火度の分類 |
| 発火度 |
発火温度の範囲 |
| G1 |
over 450℃ |
| G2 |
300℃ ~ 450℃ |
| G3 |
200℃ ~ 300℃ |
| G4 |
135℃ ~ 200℃ |
| G5 |
100℃ ~ 135℃ |
|
| 爆発等級の分類 |
| 爆発等級 |
Gap
with a25mm-length of path wich permits
a fame propagation |
| 1 |
over 0.6mm |
| 2 |
0.4 ~ 0.6mm |
| 3 |
up to 0.4mm |
|
| 可燃性ガスの発火度-爆発等級の区分 |
 |
G1 |
G2 |
G3 |
G4 |
G5 |
| 1 |
Methane,
ethane
propane,benzene,
toluene,methanol
acetone,
ethyl acetate,
carbon monoxide,
ammonia |
Butane,
ethanol,
butanol,
amil acetate |
n-hexane,
gassoline |
Acetoal-dehyde,
ether |
|
| 2 |
Coal gas |
Ethylene,
Ethylene oxide |
|
|
|
| 3 |
Hydrogen,
water gas |
Acetylene |
|
|
Carbon
bisulfide |
|
