User's Manual

Copyright © 2012 Discount Two-Way Radio Corporation - North American Distributor
7
BR850
TM
Professional Two-Way Radio Instruction Manual
Group Typical Hazard
A Acetylene
B Hydrogen
C Ethylene, ethyl ether, cyclopropane
D Gasoline, naphtha, butane, propane,
alcohol, acetone, benzol, natural gas
E Metal dust including aluminum, mag-
nesium, and their alloys
F Carbon black, coal or coke dust
G Flour, starch, or grain dust
Classication of Atmospheres:
Class Maximum Surface Temperature
T1 842°F (450°C)
T2 572°F (300°C)
T2A 536 °F (280°C)
T2B 500 °F (260°C)
T2C 446 °F (230°C)
T2D 419 °F (215°C)
T3 392 °F (200°C)
T3A 356 °F (180°C)
T3B 329 °F (165°C)
T3C 320 °F (160°C)
T4 275 °F (135°C)
T4A 248 °F (120°C)
T5 212 °F (100°C)
T6 185 °F (85°C)
Classication of Atmospheres: